Punctuation

 These resources will help you with   punctuation, such as using commas,   quotation marks, apostrophes, and   hyphens.

Brief Overview of Punctuation

When speaking, we can pause or change the tone of our voices to indicate emphasis. When writing, we use punctuation to indicate these places of emphases. This handout should help to clarify when and how to use various marks of punctuation.

Independent clause: a clause that has a subject and a verb and can stand alone; a complete sentence

Dependent clause: a clause that has a subject and a verb but cannot stand alone; an incomplete sentence

Comma

Use a comma to join two independent clauses and a coordinating conjunction (and, but, or, for, nor, so).

Road construction can be inconvenient, but it is necessary.

The new house has a large fenced backyard, so I am sure our dog will enjoy it.

Use a comma after an introductory phrase, prepositional phrase, or dependent clause.

To get a good grade, you must complete all your assignments.

Because Dad caught the chicken pox, we canceled our vacation.

After the wedding, the guests attended the reception.

Use a comma to separate elements in a series. Although there is no set rule that requires a comma before the last item in a series, it seems to be a general academic convention to include it. The examples below demonstrate this trend.

On her vacation, Lisa visited Greece, Spain, and Italy.

In their speeches, many of the candidates promised to help protect the environment, bring about world peace, and end world hunger.

Use a comma to separate nonessential elements from a sentence. More specifically, when a sentence includes information that is not crucial to the message or intent of the sentence, enclose it in or separate it by commas.

John's truck, a red Chevrolet, needs new tires.

When he realized he had overslept, Matt rushed to his car and hurried to work.

Use a comma between coordinate adjectives (adjectives that are equal and reversible).

The irritable, fidgety crowd waited impatiently for the rally speeches to begin.

The sturdy, compact suitcase made a perfect gift.

Use a comma after a transitional element (however, therefore, nonetheless, also, otherwise, finally, instead, thus, of course, above all, for example, in other words, as a result, on the other hand, in conclusion, in addition)

For example, the Red Sox, Yankees, and Indians are popular baseball teams.

If you really want to get a good grade this semester, however, you must complete all assignments, attend class, and study your notes.

Use a comma with quoted words.

"Yes," she promised. Todd replied, saying, "I will be back this afternoon."

Use a comma in a date.

October 25, 1999

Monday, October 25, 1999

25 October 1999

Use a comma in a number.

15,000,000

1614 High Street

Use a comma in a personal title.

Pam Smith, MD

Mike Rose, Chief Financial Officer for Operations, reported the quarter's earnings.

Use a comma to separate a city name from the state.

West Lafayette, Indiana

Dallas, Texas

Avoid comma splices (two independent clauses joined only by a comma). Instead, separate the clauses with a period, with a comma followed by a coordinating conjunction, or with a semicolon.

Semicolon

Use a semicolon to join two independent clauses when the second clause restates the first or when the two clauses are of equal emphasis.

Road construction in Dallas has hindered travel around town; streets have become covered with bulldozers, trucks, and cones.

Use a semicolon to join two independent clauses when the second clause begins with a conjunctive adverb (however, therefore, moreover, furthermore, thus, meanwhile, nonetheless, otherwise) or a transition (in fact, for example, that is, for instance, in addition, in other words, on the other hand, even so).

Terrorism in the United States has become a recent concern; in fact, the concern for America's safety has led to an awareness of global terrorism.

Use a semicolon to join elements of a series when individual items of the series already include commas.

Recent sites of the Olympic Games include Athens, Greece; Salt Lake City, Utah; Sydney, Australia; Nagano, Japan.

For more information on semicolons, please see the "90-Second Semicolon" vidcast series on the Purdue OWL YouTube Channel.

Colon

Use a colon to join two independent clauses when you wish to emphasize the second clause.

Road construction in Dallas has hindered travel around town: parts of Main, Fifth, and West Street are closed during the construction.

Use a colon after an independent clause when it is followed by a list, a quotation, an appositive, or other ideas directly related to the independent clause.

Julie went to the store for some groceries: milk, bread, coffee, and cheese.

In his Gettysburg Address, Abraham Lincoln urges Americans to rededicate themselves to the unfinished work of the deceased soldiers: "It is for us the living rather to be dedicated here to the unfinished work which they who fought here have thus far so nobly advanced. It is rather for us to be here dedicated to the great task remaining before us — that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion — that we here highly resolve that these dead shall not have died in vain, that this nation under God shall have a new birth of freedom, and that government of the people, by the people, for the people shall not perish from the earth."

I know the perfect job for her: a politician.

Use a colon at the end of a business letter greeting.

To Whom It May Concern:

Use a colon to separate the hour and minute(s) in a time notation.

12:00 p.m.

Use a colon to separate the chapter and verse in a Biblical reference.

Matthew 1:6

Parenthesis

Parentheses are used to emphasize content. They place more emphasis on the enclosed content than commas. Use parentheses to set off nonessential material, such as dates, clarifying information, or sources, from a sentence.

Muhammed Ali (1942-2016), arguably the greatest athlete of all time, claimed he would "float like a butterfly, sting like a bee."

Dash

Dashes are used to set off or emphasize the content enclosed within dashes or the content that follows a dash. Dashes place more emphasis on this content than parentheses.

Perhaps one reason why the term has been so problematic—so resistant to definition, and yet so transitory in those definitions—is because of its multitude of applications.

In terms of public legitimacy—that is, in terms of garnering support from state legislators, parents, donors, and university administrators—English departments are primarily places where advanced literacy is taught.

The U.S.S. Constitution became known as "Old Ironsides" during the War of 1812—during which the cannonballs fired from the British H.M.S. Guerriere merely bounced off the sides of the Constitution.

To some of you, my proposals may seem radical—even revolutionary.

Use a dash to set off an appositive phrase that already includes commas. An appositive is a word that adds explanatory or clarifying information to the noun that precedes it.

The cousins—Tina, Todd, and Sam—arrived at the party together.

Quotation Marks

Use quotation marks to enclose direct quotations. Note that commas and periods are placed inside the closing quotation mark, and colons and semicolons are placed outside. The placement of question and exclamation marks depends on the situation.

He asked, "When will you be arriving?" I answered, "Sometime after 6:30."

Use quotation marks to indicate the novel, ironic, or reserved use of a word.

History is stained with blood spilled in the name of "justice."

Use quotation marks around the titles of short poems, song titles, short stories, magazine or newspaper articles, essays, speeches, chapter titles, short films, and episodes of television or radio shows.

"Self-Reliance," by Ralph Waldo Emerson

"Just Like a Woman," by Bob Dylan

"The Smelly Car," an episode of Seinfeld

Do not use quotation marks in indirect or block quotations.

Italics

Underlining and italics are often used interchangeably. Before word-processing programs were widely available, writers would underline certain words to indicate to publishers to italicize whatever was underlined. Although the general trend has been moving toward italicizing instead of underlining, you should remain consistent with your choice throughout your paper. To be safe, you could check with your teacher to find out which he/she prefers. Italicize the titles of magazines, books, newspapers, academic journals, films, television shows, long poems, plays of three or more acts, operas, musical albums, works of art, websites, and individual trains, planes, or ships.

Time

Romeo and Juliet by William Shakespeare

The Metamorphosis of Narcissus by Salvador Dali

Amazon.com

Titanic

Italicize foreign words.

Semper fi, the motto of the U.S. Marine Corps, means "always faithful."

Italicize a word or phrase to add emphasis.

The truth is of utmost concern!

Italicize a word when referring to that word.

The word justice is often misunderstood and therefore misused.

Punctuation in Types of Sentences

Learning rules for how and when to punctuate a sentence can be difficult, especially when you consider that different types of sentences call for different types of punctuation. This handout should help to clarify not only the types of sentences, but also what punctuation to use in what situation.

Punctuation in Types of Sentences

Independent clause: a clause that has a subject and a verb and can stand alone; a complete sentence

Dependent clause: a clause that has a subject and a verb but cannot stand alone; an incomplete sentence

Simple: composed of 1 independent clause.

No standard punctuation.

Compound: composed of 2 or more independent clauses.

Join 2 independent clauses by a comma and a coordinating conjunction (and, but, or, for, nor, so).

Road construction can be inconvenient, but it is necessary.

Join 2 independent clauses by a colon when you wish to emphasize the second clause.

Road construction in Dallas has hindered travel around town: parts of Main, Fifth, and West Street are closed during the construction.

Join 2 independent clauses by a semicolon when the second clause restates the first or when the two clauses are of equal emphasis.

Road construction in Dallas has hindered travel around town; streets have become covered with bulldozers, trucks, and cones.

Complex: composed of 1 or more dependent clauses and 1 or more independent clauses.

Join an introductory dependent clause with the independent clause by a comma.

Because road construction has hindered travel around town, many people have opted to ride bicycles or walk to work.

Many people have opted to ride bicycles or walk to work because road construction has hindered travel around town.

Compound-Complex: composed of 1 or more dependent clauses and 2 or more independent clauses.

Join an introductory dependent clause with an independent clause with a comma. Separate 2 independent clauses with a comma and a coordinating conjunction (and, but, or, for, nor, so).

When it is filtered, water is cleaner, and it tastes better.

Join an introductory dependent clause with an independent clause with a comma. Separate 2 independent clauses by a colon when you wish to emphasize the second clause.

Whenever it is possible, you should filter your water: filtered water is cleaner and tastes better.

Join an introductory dependent clause with an independent clause with a comma. Separate 2 independent clauses by a semicolon when the second clause restates the first or when the two clauses are of equal emphasis.

When it is filtered, water is cleaner and tastes better; all things considered, it is better for you.

Sentence Punctuation Patterns

To punctuate a sentence, you can use and combine some of these patterns. For more information on independent and dependent clauses plus independent and dependent markers, see our handouts on those subjects.

Pattern One: Simple sentence

This pattern is an example of a simple sentence:

Independent clause [ . ]

Example: Doctors are concerned about the rising death rate from asthma.

Pattern Two : Compound Sentence

This pattern is an example of a compound sentence with a coordinating conjunction:

Independent clause [ , ] coordinating conjunction independent clause [ . ]

There are seven coordinating conjunctions: and, but, for, or, nor, so, yet.

Example: Doctors are concerned about the rising death rate from asthma, but they don't know the reasons for it.

Pattern Three: Compound Sentence

This pattern is an example of a compound sentence with a semicolon.

Independent clause [ ; ] independent clause [ . ]

Example: Doctors are concerned about the rising death rate from asthma; they are unsure of its cause.

Pattern Four: Compound Sentence

This pattern is an example of a compound sentence with an independent marker.

Independent clause [ ; ] independent marker [ , ] independent clause [ . ]

Examples of independent markers are the following: therefore, moreover, thus, consequently, however, also.

Example: Doctors are concerned about the rising death rate from asthma; therefore, they have called for more research into its causes.

Pattern Five: Complex Sentence

This pattern is an example of a complex sentence with a dependent marker.

Dependent marker dependent clause[ , ] Independent clause[ . ]

Examples of dependent markers are as follows: because, before, since, while, although, if, until, when, after, as, as if.

Example: Because doctors are concerned about the rising death rate from asthma, they have called for more research into its causes.

Pattern Six: Complex Sentence

This pattern is an example of a complex sentence with a dependent marker.

Independent clause dependent marker dependent clause [ . ]

Examples of dependent markers are as follows: because, before, since, while, although, if, until, when, after, as, as if.

Example: Doctors are concerned about the rising death rate from asthma because it is a common, treatable illness.

Pattern Seven

This pattern includes an independent clause with an embedded non-essential clause or phrase

First part of an independent clause [ , ] non-essential clause or phrase, rest of the independent clause [ . ]

A non-essential clause or phrase is one that can be removed without changing the meaning of the sentence or making it ungrammatical. In other words, the non-essential clause or phrase gives additional information, but the sentence can stand alone without it.

Example: Many doctors, including both pediatricians and family practice physicians, are concerned about the rising death rate from asthma.

Pattern Eight

This pattern includes an independent clause with an embedded essential clause or phrase

First part of an independent clause essential clause or phrase rest of the independent clause [ . ]

An essential clause or phrase is one that cannot be removed without changing the overall meaning of the sentence.

Example: Many doctors who are concerned about the rising death rate from asthma have called for more research into its causes.

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Identifying Independent and Dependent Clauses

When you want to use commas and semicolons in sentences and when you are concerned about whether a sentence is or is not a fragment, a good way to start is to be able to recognize dependent and independent clauses. The definitions offered here will help you with this.

Independent Clause

An independent clause is a group of words that contains a subject and verb and expresses a complete thought. An independent clause is a sentence.

Jim studied in the Sweet Shop for his chemistry quiz.

Dependent Clause

A dependent clause is a group of words that contains a subject and verb but does not express a complete thought. A dependent clause cannot be a sentence. Often a dependent clause is marked by a dependent marker word.

When Jim studied in the Sweet Shop for his chemistry quiz . . . (What happened when he studied? The thought is incomplete.)

Dependent Marker Word

A dependent marker word is a word added to the beginning of an independent clause that makes it into a dependent clause.

When Jim studied in the Sweet Shop for his chemistry quiz, it was very noisy.

Some common dependent markers are: after, although, as, as if, because, before, even if, even though, if, in order to, since, though, unless, until, whatever, when, whenever, whether, and while.

Connecting independent clauses

There are two types of words that can be used as connectors at the beginning of an independent clause: coordinating conjunctions and independent marker words.

1. Coordinating Conjunction

The seven coordinating conjunctions used as connecting words at the beginning of an independent clause are and, but, for, or, nor, so, and yet. When the second independent clause in a sentence begins with a coordinating conjunction, a comma is needed before the coordinating conjunction:

Jim studied in the Sweet Shop for his chemistry quiz, but it was hard to concentrate because of the noise.

2. Independent Marker Word

An independent marker word is a connecting word used at the beginning of an independent clause. These words can always begin a sentence that can stand alone. When the second independent clause in a sentence has an independent marker word, a semicolon is needed before the independent marker word.

Jim studied in the Sweet Shop for his chemistry quiz; however, it was hard to concentrate because of the noise.

Some common independent markers are: also, consequently, furthermore, however, moreover, nevertheless, and therefore.

Connecting dependent and independent clauses

Subordinating conjunctions allow writers to construct complex sentences, which have an independent clause and a subordinate (or dependent) clause. Either clause can come first.

The students acted differently whenever a substitute taught the class.

Whenever a substitute taught the class, the students acted differently.

Note that the clauses are separated with a comma when the dependent clause comes first.

Some common subordinating conjunctions are: after, as, before, once, since, until, and while.

Some Common Errors to Avoid

Comma Splices

A comma splice is the use of a comma between two independent clauses. You can usually fix the error by changing the comma to a period and therefore making the two clauses into two separate sentences, by changing the comma to a semicolon, or by making one clause dependent by inserting a dependent marker word in front of it.

Incorrect: I like this class, it is very interesting.

• Correct: I like this class. It is very interesting.
• (or) I like this class; it is very interesting.
• (or) I like this class, and it is very interesting.
• (or) I like this class because it is very interesting.
• (or) Because it is very interesting, I like this class.

Fused Sentences

Fused sentences happen when there are two independent clauses not separated by any form of punctuation. This error is also known as a run-on sentence. The error can sometimes be corrected by adding a period, semicolon, or colon to separate the two sentences.

Incorrect: My professor is intelligent I've learned a lot from her.

• Correct: My professor is intelligent. I've learned a lot from her.
• (or) My professor is intelligent; I've learned a lot from her.
• (or) My professor is intelligent, and I've learned a lot from her.
• (or) My professor is intelligent; moreover, I've learned a lot from her.

Sentence Fragments

Sentence fragments happen by treating a dependent clause or other incomplete thought as a complete sentence. You can usually fix this error by combining it with another sentence to make a complete thought or by removing the dependent marker.

Incorrect: Because I forgot the exam was today.

• Correct: Because I forgot the exam was today, I didn't study.
• (or) I forgot the exam was today.

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Run-ons - Comma Splices - Fused Sentences

Run-ons, comma splices, and fused sentences are all names given to compound sentences that are not punctuated correctly. The best way to avoid such errors is to punctuate compound sentences correctly by using one or the other of these rules.

1. Join the two independent clauses with one of the coordinating conjunctions (and, but, for, or, nor, so, yet), and use a comma before the connecting word.

_________________________, and _________________________.

He enjoys walking through the country, and he often goes backpacking on his vacations.

2. When you do not have a connecting word (or when you use a connecting word other than and, but, for, or nor, so, or yet between the two independent clauses) use a semicolon (;).

__________________________;_____________________________.

He often watched TV when there were only reruns; she preferred to read instead.

or

__________________________; however,____________________.

He often watched TV when there were only reruns; however, she preferred to read instead.

So, run-ons and fused sentences are terms describing two independent clauses that are joined together with no connecting word or punctuation to separate the clauses.

INCORRECT: They weren't dangerous criminals they were detectives in disguise.

CORRECT: They weren't dangerous criminals; they were detectives in disguise.

INCORRECT: I didn't know which job I wanted I was too confused to decide.

CORRECT: I didn't know which job I wanted, and I was too confused to decide.

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Commas: Quick Rules

The comma is a valuable, useful punctuation device because it separates the structural elements of sentences into manageable segments. The rules provided here are those found in traditional handbooks; however, in certain rhetorical contexts and for specific purposes, these rules may be broken.

The following is a short guide to get you started using commas. This resource also includes sections with more detailed rules and examples.

Quick Guide to Commas

1. Use commas to separate independent clauses when they are joined by any of these seven coordinating conjunctions: and, but, for, or, nor, so, yet.
2. Use commas after introductory a) clauses, b) phrases, or c) words that come before the main clause.
3. Use a pair of commas in the middle of a sentence to set off clauses, phrases, and words that are not essential to the meaning of the sentence. Use one comma before to indicate the beginning of the pause and one at the end to indicate the end of the pause.
4. Do not use commas to set off essential elements of the sentence, such as clauses beginning with that (relative clauses). That clauses after nouns are always essential. That clauses following a verb expressing mental action are always essential.
5. Use commas to separate three or more words, phrases, or clauses written in a series.
6. Use commas to separate two or more coordinate adjectives that describe the same noun. Be sure never to add an extra comma between the final adjective and the noun itself or to use commas with non-coordinate adjectives.
7. Use a comma near the end of a sentence to separate contrasted coordinate elements or to indicate a distinct pause or shift.
8. Use commas to set off phrases at the end of the sentence that refer back to the beginning or middle of the sentence. Such phrases are free modifiers that can be placed anywhere in the sentence without causing confusion.
9. Use commas to set off all geographical names, items in dates (except the month and day), addresses (except the street number and name), and titles in names.
10. Use a comma to shift between the main discourse and a quotation.
11. Use commas wherever necessary to prevent possible confusion or misreading.

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Extended Rules for Using Commas

Comma Use

1. Use commas to separate independent clauses when they are joined by any of these seven coordinating conjunctions: and, but, for, or, nor, so, yet.

The game was over, but the crowd refused to leave.

The student explained her question, yet the instructor still didn't seem to understand.

Yesterday was her brother's birthday, so she took him out to dinner.

2. Use commas after introductory a) clauses, b) phrases, or c) words that come before the main clause.

a. Common starter words for introductory clauses that should be followed by a comma include after, although, as, because, if, since, when, while.

While I was eating, the cat scratched at the door.

Because her alarm clock was broken, she was late for class.

If you are ill, you ought to see a doctor.

When the snow stops falling, we'll shovel the driveway.

However, don't put a comma after the main clause when a dependent (subordinate) clause follows it (except for cases of extreme contrast).

INCORRECT: The cat scratched at the door, while I was eating.

CORRECT: She was still quite upset, although she had won the Oscar. (This comma use is correct, because it is an example of extreme contrast.)

b. Common introductory phrases that should be followed by a comma include participial and infinitive phrases, absolute phrases, nonessential appositive phrases, and long prepositional phrases (over four words).

Having finished the test, he left the room.

To get a seat, you'd better come early.

After the test but before lunch, I went jogging.

The sun radiating intense heat, we sought shelter in the cafe.

c. Common introductory words that should be followed by a comma include yes, however, well.

Well, perhaps he meant no harm.

Yes, the package should arrive tomorrow morning.

However, you may not be satisfied with the results.

3. Use a pair of commas in the middle of a sentence to set off clauses, phrases, and words that are not essential to the meaning of the sentence. Use one comma before to indicate the beginning of the pause and one at the end to indicate the end of the pause.

Here are some clues to help you decide whether the sentence element is essential:

• If you leave out the clause, phrase, or word, does the sentence still make sense?
• Does the clause, phrase, or word interrupt the flow of words in the original sentence?
• If you move the element to a different position in the sentence, does the sentence still make sense?

If you answer "yes" to one or more of these questions, then the element in question is nonessential and should be set off with commas. Here are some example sentences with nonessential elements:

Clause: That Tuesday, which happens to be my birthday, is the only day when I am available to meet.

Phrase: This restaurant has an exciting atmosphere. The food, on the other hand, is rather bland.

Word: I appreciate your hard work. In this case, however, you seem to have over-exerted yourself.

4. Do not use commas to set off essential elements of the sentence, such as clauses beginning with that (relative clauses). That clauses after nouns are always essential. That clauses following a verb expressing mental action are always essential.

That clauses after nouns:

The book that I borrowed from you is excellent.

The apples that fell out of the basket are bruised.

That clauses following a verb expressing mental action:

She believes that she will be able to earn an A.

He is dreaming that he can fly.

I contend that it was wrong to mislead her.

They wished that warm weather would finally arrive.

Examples of other essential elements (no commas):

Students who cheat only harm themselves.

The baby wearing a yellow jumpsuit is my niece.

The candidate who had the least money lost the election.

Examples of nonessential elements (set off by commas):

Fred, who often cheats, is just harming himself.

My niece, wearing a yellow jumpsuit, is playing in the living room.

The Green party candidate, who had the least money, lost the election.

Apples, which are my favorite fruit, are the main ingredient in this recipe.

Professor Benson, grinning from ear to ear, announced that the exam would be tomorrow.

Tom, the captain of the team, was injured in the game.

It is up to you, Jane, to finish.

She was, however, too tired to make the trip.

Two hundred dollars, I think, is sufficient.

5. Use commas to separate three or more words, phrases, or clauses written in a series.

The Constitution establishes the legislative, executive, and judicial branches of government.

The candidate promised to lower taxes, protect the environment, reduce crime, and end unemployment.

The prosecutor argued that the defendant, who was at the scene of the crime, who had a strong revenge motive, and who had access to the murder weapon, was guilty of homicide.

6. Use commas to separate two or more coordinate adjectives that describe the same noun. Be sure never to add an extra comma between the final adjective and the noun itself or to use commas with non-coordinate adjectives.

Coordinate adjectives are adjectives with equal ("co"-ordinate) status in describing the noun; neither adjective is subordinate to the other. You can decide if two adjectives in a row are coordinate by asking the following questions:

• Does the sentence make sense if the adjectives are written in reverse order?
• Does the sentence make sense if the adjectives are written with and between them?

If you answer yes to these questions, then the adjectives are coordinate and should be separated by a comma. Here are some examples of coordinate and non-coordinate adjectives:

He was a difficult, stubborn child. (coordinate)

They lived in a white frame house. (non-coordinate)

She often wore a gray wool shawl. (non-coordinate)

Your cousin has an easy, happy smile. (coordinate)

The 1) relentless, 2) powerful 3) summer sun beat down on them. (1-2 are coordinate; 2-3 are non-coordinate.)

The 1) relentless, 2) powerful, 3) oppressive sun beat down on them. (Both 1-2 and 2-3 are coordinate.)

7. Use a comma near the end of a sentence to separate contrasted coordinate elements or to indicate a distinct pause or shift.

He was merely ignorant, not stupid.

The chimpanzee seemed reflective, almost human.

You're one of the senator's close friends, aren't you?

The speaker seemed innocent, even gullible.

8. Use commas to set off phrases at the end of the sentence that refer to the beginning or middle of the sentence. Such phrases are free modifiers that can be placed anywhere in the sentence without causing confusion. (If the placement of the modifier causes confusion, then it is not "free" and must remain "bound" to the word it modifies.)

Nancy waved enthusiastically at the docking ship, laughing joyously. (correct)

INCORRECT: Lisa waved at Nancy, laughing joyously. (Who is laughing, Lisa or Nancy?)

Laughing joyously, Lisa waved at Nancy. (correct)

Lisa waved at Nancy, who was laughing joyously. (correct)

9. Use commas to set off all geographical names, items in dates (except the month and day), addresses (except the street number and name), and titles in names.

Birmingham, Alabama, gets its name from Birmingham, England.

July 22, 1959, was a momentous day in his life. Who lives at 1600 Pennsylvania Avenue, Washington, DC?

Rachel B. Lake, MD, will be the principal speaker.

(When you use just the month and the year, no comma is necessary after the month or year: "The average temperatures for July 1998 are the highest on record for that month.")

10. Use a comma to shift between the main discourse and a quotation.

John said without emotion, "I'll see you tomorrow."

"I was able," she answered, "to complete the assignment."

In 1848, Marx wrote, "Workers of the world, unite!"

11. Use commas wherever necessary to prevent possible confusion or misreading.

To George, Harrison had been a sort of idol.

Comma abuse

Commas in the wrong places can break a sentence into illogical segments or confuse readers with unnecessary and unexpected pauses.

12. Don't use a comma to separate the subject from the verb.

INCORRECT: An eighteen-year-old in California, is now considered an adult.

INCORRECT: The most important attribute of a ball player, is quick reflex actions.

13. Don't put a comma between the two verbs or verb phrases in a compound predicate.

INCORRECT: We laid out our music and snacks, and began to study.

INCORRECT: I turned the corner, and ran smack into a patrol car.

14. Don't put a comma between the two nouns, noun phrases, or noun clauses in a compound subject or compound object.

INCORRECT (compound subject): The music teacher from your high school, and the football coach from mine are married.

INCORRECT (compound object): Jeff told me that the job was still available, and that the manager wanted to interview me.

15. Don't put a comma after the main clause when a dependent (subordinate) clause follows it (except for cases of extreme contrast).

INCORRECT: The cat scratched at the door, while I was eating.

CORRECT: She was still quite upset, although she had won the Oscar. (This comma use is correct, because it is an example of extreme contrast)

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Commas After Introductions

Introductory Clauses

Introductory clauses are dependent clauses that provide background information or "set the stage" for the main part of the sentence, the independent clause. For example:

If they want to win, athletes must exercise every day.

(introductory dependent clause, main clause)

Because Smokey kept barking insistently, we threw the ball for him.

(introductory dependent clause, main clause)

Introductory clauses start with adverbs like after, although, as, because, before, if, since, though, until, when, etc.

Introductory phrases

Introductory phrases also set the stage for the main action of the sentence, but they are not complete clauses. Phrases don't have both a subject and a verb that are separate from the subject and verb in the main clause of the sentence. Common introductory phrases include prepositional phrases, appositive phrases, participial phrases, infinitive phrases, and absolute phrases.

To stay in shape for competition, athletes must exercise every day.

(introductory infinitive phrase, main clause)

Barking insistently, Smokey got us to throw his ball for him.

(introductory participial phrase, main clause)

A popular and well respected mayor, Bailey was the clear favorite in the campaign for governor.

(introductory appositive phrase, main clause)

The wind blowing violently, the townspeople began to seek shelter.

(introductory absolute phrase, main clause)

After the adjustment for inflation, real wages have decreased while corporate profits have grown.

(introductory prepositional phrases, main clause)

Introductory words

Introductory words like however, still, furthermore, and meanwhile create continuity from one sentence to the next.

The coaches reviewed the game strategy. Meanwhile, the athletes trained on the Nautilus equipment.

Most of the evidence seemed convincing. Still, the credibility of some witnesses was in question.

When to use a comma

Introductory elements often require a comma, but not always. Use a comma in the following cases:

• After an introductory clause.
• After a long introductory prepositional phrase or more than one introductory prepositional phrase.
• After introductory verbal phrases, some appositive phrases, or absolute phrases.
• If there is a distinct pause.
• To avoid confusion.

When not to use a comma

Some introductory elements don't require a comma, and sometimes the subject of a sentence looks like an introductory element but isn't. Do not use a comma in the following cases:

• After a brief prepositional phrase. (Is it a single phrase of fewer than five words?)
• After a restrictive (essential) appositive phrase. (See our document on appositives.)
• To separate the subject from the predicate. (See below.)

Each of the following sentences may look like it requires a comma after the opening segment (marked with an x), but the opening segment is really the subject. It's sometimes easy to confuse gerund- or infinitive-phrase subjects like the following with nonessential introductory phrases, so be careful.

Preparing and submitting his report to the committee for evaluation and possible publication[x] was one of the most difficult tasks Bill had ever attempted.

To start a new business without doing market research and long-term planning in advance[x] would be foolish.

Extracting the most profit for the least expenditure on labor and materials[x] is the primary goal of a capitalist.

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Commas vs. Semicolons in Compound Sentences

For more information on semicolons, please see the "90-Second Semicolon" vidcast series on the Purdue OWL YouTube Channel.

A group of words containing a subject and a verb and expressing a complete thought is called a sentence or an independent clause. Sometimes, an independent clause stands alone as a sentence, and sometimes two independent clauses are linked together into what is called a compound sentence. Depending on the circumstances, one of two different punctuation marks can be used between the independent clauses in a compound sentence: a comma or a semicolon. The choice is yours.

Comma (,)

Use a comma after the first independent clause when you link two independent clauses with one of the following coordinating conjunctions: and, but, for, or, nor, so, yet. For example:

I am going home, and I intend to stay there.

It rained heavily during the afternoon, but we managed to have our picnic anyway.

They couldn't make it to the summit and back before dark, so they decided to camp for the night.

Semicolon (;)

Use a semicolon when you link two independent clauses with no connecting words. For example:

I am going home; I intend to stay there.

It rained heavily during the afternoon; we managed to have our picnic anyway.

They couldn't make it to the summit and back before dark; they decided to camp for the night.

You can also use a semicolon when you join two independent clauses together with one of the following conjunctive adverbs (adverbs that join independent clauses): however, moreover, therefore, consequently, otherwise, nevertheless, thus, etc. For example:

I am going home; moreover, I intend to stay there.

It rained heavily during the afternoon; however, we managed to have our picnic anyway.

They couldn't make it to the summit and back before dark; therefore, they decided to camp for the night.

For more information about compound sentence patterns, see the Purdue OWL handout on Sentence Punctuation Patterns.

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Commas with Nonessential Elements

Some modifying elements of a sentence are essential, restricting the meaning of a modified term, while others are nonessential and don't restrict the modified term's meaning. These nonessential elements, which can be words, phrases, or clauses, are set off with commas.

Rule: Use commas before and after nonessential words, phrases, and clauses, that is, elements embedded in the sentence that interrupt it without changing the essential meaning.

If you leave out the element or put it somewhere else in the sentence, does the essential meaning of the sentence change? If so, the element is essential; if not, it is nonessential.

Nonessential: The average world temperature, however, has continued to rise significantly. (word)

Essential: The sixth-century philosopher Boethius was arrested, tortured, and bludgeoned to death. (word)

Nonessential: Company managers, seeking higher profits, hired temporary workers to replace full-time staff. (phrase)

Essential: The person checking tickets at the counter asked for a form of identification. (phrase)

Nonessential: My uncle, who is eighty years old, walks three miles every day. (clause)

Essential: The woman who interviewed you is my sister. (clause)

Deciding whether an element is essential or nonessential can sometimes be tricky. For help identifying two common types of phrases that can be either essential or nonessential, see the OWL handouts on verbals, which includes information on participial phrases, as well as the handout on appositives, which covers appositive phrases. Both of these documents address the essential/nonessential distinction for these kinds of phrases.

You can try three different interactive exercises that allow you to practice these rules, each with its own answer key.

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The Apostrophe

The apostrophe has three uses:

1. To form possessives of nouns
2. To show the omission of letters
3. To indicate certain plurals of lowercase letters

Forming Possessives of Nouns

To see if you need to make a possessive, turn the phrase around and make it an "of the..." phrase. For example:

the boy's hat = the hat of the boy

three days' journey = journey of three days

If the noun after "of" is a building, an object, or a piece of furniture, then no apostrophe is needed!

room of the hotel = hotel room
door of the car = car door
leg of the table = table leg

Once you've determined whether you need to make a possessive, follow these rules to create one.

• add 's to the singular form of the word (even if it ends in -s):

  the owner's car
  James's hat (James' hat is also acceptable. For plural, proper nouns that are possessive, use an apostrophe after the 's': "The Eggleses' presentation was good." The Eggleses are a husband and wife consultant team.)

  NOTE: the generally accepted convention for most academic styles (including CMOS, APA, and MLA) is to add apostophe + s to the singular form of the word, even if it ends in "s." Non-academic styles, such as AP, suggest simply adding an apostrophe to the end of a word that ends in "s." Please check the style guide of whatever format you're using to make sure you're in line with their recommendations.

 

• add 's to the plural forms that do not end in -s:

  the children's game
  the geese's honking

• add ' to the end of plural nouns that end in -s:

  two cats' toys
  three friends' letters
  the countries' laws

• add 's to the end of compound words:

  my brother-in-law's money

• add 's to the last noun to show joint possession of an object:

  Todd and Anne's apartment

Showing omission of letters

Apostrophes are used in contractions. A contraction is a word (or set of numbers) in which one or more letters (or numbers) have been omitted. The apostrophe shows this omission. Contractions are common in speaking and in informal writing. To use an apostrophe to create a contraction, place an apostrophe where the omitted letter(s) would go. Here are some examples:

don't = do not
I'm = I am
he'll = he will
who's = who is
shouldn't = should not
didn't = did not
could've= could have (NOT "could of"!)
'60 = 1960

Forming plurals of lowercase letters

Apostrophes are used to form plurals of letters that appear in lowercase; here the rule appears to be more typographical than grammatical, e.g. "three ps" versus "three p's." To form the plural of a lowercase letter, place 's after the letter. There is no need for apostrophes indicating a plural on capitalized letters, numbers, and symbols (though keep in mind that some editors, teachers, and professors still prefer them). Here are some examples:

p's and q's = minding your p's and q's is a phrase believed to be taken from the early days of the printing press when letters were set in presses backwards so they would appear on the printed page correctly. Although the origins of this phrase are disputed, the expression was used commonly to mean, "Be careful, don't make a mistake." Today, the term also indicates maintaining politeness, possibly from "mind your pleases and thank-yous."

Nita's mother constantly stressed minding one's p's and q's.

three Macintosh G4s = three of the Macintosh model G4

There are three G4s currently used in the writing classroom.

many &s = many ampersands

That printed page has too many &s on it.

the 1960s = the years in decade from 1960 to 1969

The 1960s were a time of great social unrest.

The '60s were a time of great social unrest.

Don't use apostrophes for personal pronouns, the relative pronoun who, or for noun plurals.

Apostrophes should not be used with possessive pronouns because possessive pronouns already show possession—they don't need an apostrophe. His, her, its, my, yours, ours are all possessive pronouns. However, indefinite pronouns, such as one, anyone, other, no one, and anybody, can be made possessive. Here are some examples:

INCORRECT: his' book
CORRECT: his book
CORRECT: one's book
CORRECT: anybody's book

INCORRECT: Who's dog is this?
CORRECT: Whose dog is this?

INCORRECT: The group made it's decision.
CORRECT: The group made its decision.

(Note: Its and it's are not the same thing. It's is a contraction for "it is" and its is a possessive pronoun meaning "belonging to it." It's raining out = it is raining out. A simple way to remember this rule is the fact that you don't use an apostrophe for the possessive his or hers, so don't do it with its!)

INCORRECT: a friend of yours'
CORRECT: a friend of yours

INCORRECT: She waited for three hours' to get her ticket.
CORRECT: She waited for three hours to get her ticket.

Proofreading for apostrophes

A good time to proofread is when you have finished writing the paper. Try the following strategies to proofread for apostrophes:

• If you tend to leave out apostrophes, check every word that ends in -s or -es to see if it needs an apostrophe.
• If you put in too many apostrophes, check every apostrophe to see if you can justify it with a rule for using apostrophes.

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Hyphen Use

Two words brought together as a compound may be written separately, written as one word, or connected by hyphens. For example, three modern dictionaries all have the same listings for the following compounds:

hair stylist
hairsplitter
hair-raiser

Another modern dictionary, however, lists hairstylist, not hair stylist. Compounding is obviously in a state of flux, and authorities do not always agree in all cases, but the uses of the hyphen offered here are generally agreed upon.

1. Use a hyphen to join two or more words serving as a single adjective before a noun:
   a one-way street
   chocolate-covered peanuts
   well-known author
   However, when compound modifiers come after a noun, they are not hyphenated:
   The peanuts were chocolate covered.
   The author was well known.
2. Use a hyphen with compound numbers:
   forty-six
   sixty-three
   Our much-loved teacher was sixty-three years old.
3. Use a hyphen to avoid confusion or an awkward combination of letters:
   re-sign a petition (vs. resign from a job)
   semi-independent (but semiconscious)
   shell-like (but childlike)
4. Use a hyphen with the prefixes ex- (meaning former), self-, all-; with the suffix -elect; between a prefix and a capitalized word; and with figures or letters:
   ex-husband
   self-assured
   mid-September
   all-inclusive
   mayor-elect
   anti-American
   T-shirt
   pre-Civil War
   mid-1980s
5. Use a hyphen to divide words at the end of a line if necessary, and make the break only between syllables:
   pref-er-ence
   sell-ing
   in-di-vid-u-al-ist
6. For line breaks, divide already-hyphenated words only at the hyphen:
   mass-
   produced
   self-
   conscious
7. For line breaks in words ending in -ing, if a single final consonant in the root word is doubled before the suffix, hyphenate between the consonants; otherwise, hyphenate at the suffix itself:
   plan-ning
   run-ning
   driv-ing
   call-ing
8. Never put the first or last letter of a word at the end or beginning of a line, and don't put two-letter suffixes at the beginning of a new line:
   lovely (Do not separate in a way which leaves ly beginning a new line.)
   eval-u-ate (Separate only on either side of the u; do not leave the initial e- at the end of a line.)

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How to Use Quotation Marks

Using Quotation Marks

The primary function of quotation marks is to set off and represent exact language (either spoken or written) that has come from somebody else. The quotation mark is also used to designate speech acts in fiction and sometimes poetry. Since you will most often use them when working with outside sources, successful use of quotation marks is a practical defense against accidental plagiarism and an excellent practice in academic honesty. The following rules of quotation mark use are the standard in the United States, although it may be of interest that usage rules for this punctuation do vary in other countries.

The following covers the basic use of quotation marks. For details and exceptions consult the separate sections of this guide.

Direct Quotations

Direct quotations involve incorporating another person's exact words into your own writing.

1. Quotation marks always come in pairs. Do not open a quotation and fail to close it at the end of the quoted material.
2. Capitalize the first letter of a direct quote when the quoted material is a complete sentence.

   Mr. Johnson, who was working in his field that morning, said, "The alien spaceship appeared right before my own two eyes."

3. Do not use a capital letter when the quoted material is a fragment or only a piece of the original material's complete sentence.

   Although Mr. Johnson has seen odd happenings on the farm, he stated that the spaceship "certainly takes the cake" when it comes to unexplainable activity.

4. If a direct quotation is interrupted mid-sentence, do not capitalize the second part of the quotation.

   "I didn't see an actual alien being," Mr. Johnson said, "but I sure wish I had."

5. In all the examples above, note how the period or comma punctuation always comes before the final quotation mark. It is important to realize also that when you are using MLA or some other form of documentation, this punctuation rule may change.

   When quoting text with a spelling or grammar error, you should transcribe the error exactly in your own text. However, also insert the term sic in italics directly after the mistake, and enclose it in brackets. Sic is from the Latin, and translates to "thus," "so," or "just as that." The word tells the reader that your quote is an exact reproduction of what you found, and the error is not your own.

   Mr. Johnson says of the experience, "It's made me reconsider the existence of extraterestials [sic]."

6. Quotations are most effective if you use them sparingly and keep them relatively short. Too many quotations in a research paper will get you accused of not producing original thought or material (they may also bore a reader who wants to know primarily what YOU have to say on the subject).

Indirect Quotations

Indirect quotations are not exact wordings but rather rephrasings or summaries of another person's words. In this case, it is not necessary to use quotation marks. However, indirect quotations still require proper citations, and you will be committing plagiarism if you fail to do so.

Mr. Johnson, a local farmer, reported last night that he saw an alien spaceship on his own property.

Many writers struggle with when to use direct quotations versus indirect quotations. Use the following tips to guide you in your choice.

Use direct quotations when the source material uses language that is particularly striking or notable. Do not rob such language of its power by altering it.

Martin Luther King Jr. believed that the end of slavery was important and of great hope to millions of slaves done horribly wrong.

The above should never stand in for:

Martin Luther King Jr. said of the Emancipation Proclamation, "This momentous decree came as a great beacon light of hope to millions of Negro slaves who had been seared in the flames of withering injustice."

Use an indirect quotation (or paraphrase) when you merely need to summarize key incidents or details of the text.

Use direct quotations when the author you are quoting has coined a term unique to her or his research and relevant within your own paper.

When to use direct quotes versus indirect quotes is ultimately a choice you'll learn a feeling for with experience. However, always try to have a sense for why you've chosen your quote. In other words, never put quotes in your paper simply because your teacher says, "You must use quotes."

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Extended Rules for Using Quotation Marks

Altering the Source Material in a Quotation

The responsibility of representing other people's words accurately lies firmly on the shoulders of the author. Inaccurate quotes not only defeat the purpose of using a quote, they may also constitute plagiarism. However, there are approved methods for altering quotes for either clarity or succinctness.

Quote length

If the original quote is too long and you feel not all the words are necessary in your own paper, you may omit part of the quote. Replace the missing words with an ellipsis.

Original Quote: The quarterback told the reporter, "It's quite simple. They played a better game, scored more points, and that's why we lost."

Omitted Material: The quarterback told the reporter, "It's quite simple. They . . . scored more points, and that's why we lost."

Make sure that the words you remove do not alter the basic meaning of the original quote in any way. Also ensure that the quote's integration and missing material still leave a grammatically correct sentence.

Quote context

If the context of your quote might be unclear, you may add a few words to provide clarity. Enclose the added material in brackets.

Added Material: The quarterback told the reporter, "It's quite simple. They [the other team] played a better game, scored more points, and that's why we lost."

Quotations within a Quotation

Use single quotation marks to enclose quotes within another quotation.

The reporter told me, "When I interviewed the quarterback, he said they simply 'played a better game.'"

Quotation Marks Beyond Quoting

Quotation marks may additionally be used to indicate words used ironically or with some reservation.

The great march of "progress" has left millions impoverished and hungry.

Do not use quotation marks for words used as words themselves. In this case, you should use italics.

The English word nuance comes from a Middle French word meaning "shades of color."

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Additional Punctuation Rules When Using Quotation Marks

Use a comma to introduce a quotation after a standard dialogue tag, a brief introductory phrase, or a dependent clause.

The detective said, "I am sure who performed the murder."

As D.H. Nachas explains, "The gestures used for greeting others differ greatly from one culture to another."

Put commas and periods within quotation marks, except when a parenthetical reference follows.

He said, "I may forget your name, but I never forget a face."

History is stained with blood spilled in the name of "civilization."

Mullen, criticizing the apparent inaction, writes, "Donahue's policy was to do nothing" (24).

Place colons and semicolons outside closed quotation marks.

Williams described the experiment as "a definitive step forward"; other scientists disagreed.

Benedetto emphasizes three elements of what she calls her "Olympic journey": family support, personal commitment, and great coaching.

Place a question mark or exclamation point within closing quotation marks if the punctuation applies to the quotation itself. Place the punctuation outside the closing quotation marks if the punctuation applies to the whole sentence.

Phillip asked, "Do you need this book?"

Does Dr. Lim always say to her students, "You must work harder"?

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Quotation Marks with Fiction, Poetry, and Titles

Block Quotations

You should use a block quotation when the quotation occupies four or more typed lines on the page. Although they are allowed in any type of writing, you will likely most often use them when quoting from fiction or literature. A block quotation is removed from the main body of your text. Indent one inch from the main margin (the equivalent of two half-inch paragraph indentations) and begin your quote. Maintain double spacing throughout, but you do not need to use quotation marks.

Gatsby experiences a moment of clarity while standing with Daisy on his dock. Fitzgerald writes:

Possibly it had occurred to him that the colossal significance of that light had now to him vanished forever. Compared to the great distance that had separated him from Daisy it had seemed very near to her, almost touching her. It had seemed as close as a star to the moon. Now it was again a green light on a dock. His count of enchanted objects had diminished by one. (98)

Quoting Poetry

When you quote a single line of poetry, write it like any other short quotation. If the piece of poetry you are quoting crosses multiple lines of the poem itself, you may still type them in your text run together. Show the reader where the poem's line breaks fall by using slash marks.

In his poem, "Mending Wall," Robert Frost writes: "Something there is that doesn't love a wall,/ that send the frozen-ground-swell under it" (42-44).

If the quotation is three lines or longer, set it off like a block quotation (see above). Some writers prefer to set off two-line verse quotations for emphasis. Quote the poem line by line as it appears on the original page. Do not use quotation marks, and indent one inch from the left margin.

In his poem, "Mending Wall," Robert Frost questions the building of barriers and walls:

Before I built a wall I'd ask to know

What I was walling in or walling out,

And to whom I was like to give offense.

Writing Dialogue

Write each person's spoken words, however brief, as a separate paragraph. Use commas to set off dialogue tags such as "she said" or "he explained." If one person's speech goes on for more than one paragraph, use quotation marks to open the dialogue at the beginning of each paragraph. However, do not use closing quotation marks until the end of the final paragraph where that character is speaking.

Quotation Marks with Titles

Use quotations marks for:

• Titles of short or minor works
• Songs
• Short Stories
• Essays
• Short Poems
• One Act Plays
• Other literary works shorter than a three act play or complete book
• Titles of sections from longer works
• Chapters in books
• Articles in newspapers, magazines, or journals
• Episodes of television and radio series

Underlining or italics are used for the titles of long pieces or works that contain smaller sections.

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Quotation Mark Exercise and Answers

Quotation Mark Exercise

In the following sentences put in quotation marks wherever they are needed, and underline words where italics are needed.

1. Mary is trying hard in school this semester, her father said.
2. No, the taxi driver said curtly, I cannot get you to the airport in fifteen minutes.
3. I believe, Jack remarked, that the best time of year to visit Europe is in the spring. At least that's what I read in a book entitled Guide to Europe.
4. My French professor told me that my accent is abominable.
5. She asked, Is Time a magazine you read regularly?
6. Flannery O'Connor probably got the title of one of her stories from the words of the old popular song, A Good Man Is Hard to Find.
7. When did Roosevelt say, We have nothing to fear but fear itself?
8. Yesterday, John said, This afternoon I'll bring back your book Conflict in the Middle East; however, he did not return it.
9. Can you believe, Dot asked me, that it has been almost five years since we've seen each other?
10. A Perfect Day for Bananafish is, I believe, J. D. Salinger's best short story.
11. Certainly, Mr. Martin said, I shall explain the whole situation to him. I know that he will understand.

Quotation Mark Exercise Answers

1. "Mary is trying hard in school this semester," her father said.
2. "No," the taxi driver said curtly, "I cannot get you to the airport in fifteen minutes."
3. "I believe," Jack remarked, "that the best time of year to visit Europe is in the spring. At least that's what I read in a book entitled Guide to Europe."
4. My French professor told me that my accent is abominable.
5. She asked, "Is Time a magazine you read regularly?"
6. Flannery O'Connor probably got the title of one of her stories from the words of the old popular song, "A Good Man Is Hard to Find."
7. When did Roosevelt say, "We have nothing to fear but fear itself"?
8. Yesterday, John said, "This afternoon I'll bring back your book Conflict in the Middle East"; however, he did not return it.
9. "Can you believe," Dot asked me, "that it has been almost five years since we've seen each other?"
10. "A Perfect Day for Bananafish" is, I believe, J. D. Salinger's best short story.
11. "Certainly," Mr. Martin said, "I shall explain the whole situation to him. I know that he will understand."

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