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We use both which and what to ask questions. We use which when there is a restricted range of answers. We use what more commonly when the range of answers is not restricted:
Which is the capital of Liberia? Monrovia or Greenville?
What’s the capital of Liberia?
Which in relative clauses
We use which in relative clauses to refer to animals and to things:
We have seen a lot of changes which are good for business.
The cruise ship, which will depart from Liverpool for a fifteen-night Mediterranean cruise, returns to the Mersey on 29 September.
We also use which to introduce a relative clause when it refers to a whole clause or sentence:
She seemed more talkative than usual, which was because she was nervous.
People think I sit around drinking coffee all day. Which, of course, I do.
We often use which with prepositions. Some formal styles prefer to use a preposition before which rather than to leave the preposition ‘hanging’ at the end of the sentence:
There are several small ponds in which a variety of fish live. (or There are several small pondswhicha variety of fish livein.)