Some Linkers which are used in different clauses in different ways.
That :
(i) I know that he is honest. [ Noun clause - Object to know. ]
(ii) I know the boy that stole the book.
[ Adjective clause - qualifying 'boy'.]
(iii) We read that we can learn. [ Adverbial clause - modifying 'read' for purpose. ]
Where :
(i) I know where he lives now. [ Noun clause - Object to "know'. ]
(ii) I know the place where he lives now. [ Adj.cl. - qualifying the noun 'place'.]
(iii) We shall go where he lives
[Adv.cl. - modifying the verb 'go']
When:
(i) I know why he will come back [ Noun clause - Object to 'know'.]
(ii) I know the time when he will come back. I Adj. cl. - qualifying the noun 'time'. ]
(iii) We shall go when he comes. [ Adv. cl. - modifying the verb 'go'. ]
Why:
(i) I know why he looks so sad. [ Noun clause - Object to 'know. ]
(ii) I know the reason why he looks so sad. [ Adj. cl. - qualifying the noun 'reason'. ]
Who:
(i) Do you know who did it ?
[ Noun clause - Object to 'know'. ]
(ii) Do you know the boy who did it?
[ Adj. clause - Qualifying the noun 'boy'.]
Which:
(i) Do you know which is what? | Noun clause - Object to 'know'. ]
(ii) This is the pen which writes well. [ Adj. Clause - qualifying 'pen'. ]
(iii) Which is preferable is not known to me. [ Noun clause - Subject to is 'known'.]
Whether:
(i) I asked her whether she would do it or not. [ Noun cl. - Object to 'ask' ]
(ii) I shall support you whether (you are) right or wrong. [ Adv. cl. - modifying 'support']
