Which and what

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There is little difference of meaning between which and what.

Which is preferred when the speaker has a limited number of choices in mind.

When the speaker is not thinking of a limited number of choices, what is used.

Before nouns, which and what can be used to ask questions about both people and things.

When these words are used as pronouns, without nouns immediately after them, we use who, not which, for people.

However, which can be used in questions about people’s identity, and what can be used to ask about people’s jobs and functions.

See also

Was and were
Well and good
Whether and if
Which and what
Would like
Would and used to

See also

Until and till
Up and down
Used to

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