Prepositions of Time: at, in, on
We use:
• at for a precise time
• in for months, years, centuries and long periods
• on for days and dates
AT for precise time
IN for months, years, centuries and long periods
ON for days and dates
Examples:
in May
at 3 o'clock
on Sunday
at 10.30 am
in summer
on Tuesdays
in the morning
on 6 March
at noon
on 25 December, 2010
on Eid Day
on Independence Day
at dinner time
in 1990
in the evening
in the next century
at bed time
at sunrise
at night
in the Ice Age
on my birthday
at the moment
in the past/future
on New Year's Eve
Look at these examples:
• I have a meeting at 9 am.
• The shop closes at midnight.
• Jane went home at lunchtime.
• In England, it often snows in December.
• There would be a lot of progress in the next century.
• Do you work on Mondays?
• Her birthday is on 20 November.
• Where will you be on New Year's Day?
