Suppose I am a book shop keeper and someone comes to my shop and he's looking here and there in my shop. Should I ask him:
What book are you looking for?
or
Which book are you looking for?
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Sign up to join this communitySuppose I am a book shop keeper and someone comes to my shop and he's looking here and there in my shop. Should I ask him:
What book are you looking for?
or
Which book are you looking for?
To some extent this is entirely personal preference. As J.R. mentions in his comment, you may be more likely to use "what" if the customer isn't sure what kind of book is wanted, and "which" if the customer has some kind of more specific list.
However, many native speakers will use these interchangeably, without really thinking about which/what would be more appropriate. The meaning is almost exactly the same either way, at least in the given context.
As a side note: I agree with Lambie that "book shop keeper" sounds a little odd to this American. It might be more of a British English expression. I would be more inclined to say "the owner/manager of a bookshop"