Which is that book? vs What is that book?

Both phrases are correct, but they are used in different contexts. 'Which is that book?' is used when you are choosing between a limited number of options, while 'What is that book?' is used when you are asking for information about a specific book without implying a choice.

Last updated: March 25, 2024

Which is that book?

This phrase is correct when you are choosing between a limited number of options.

This phrase is used when you are selecting from a specific set of options and want to know which one is the book in question.

Examples:

We have several books on the table. Which is that book?

Alternatives:

Which book is that?

What is that book?

This phrase is correct when you are asking for information about a specific book without implying a choice.

This phrase is used when you want to know the title, author, or any other information about a book without suggesting a selection from multiple options.

Examples:

I saw you reading a book. What is that book?

Alternatives:

Can you tell me about that book?
What book are you reading?
What is the title of that book?
Who is the author of that book?

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Which is that book? vs What is that book?