Those are books that need to be returned to the library what is the antecedent of the pronoun those

Question:

What is the antecedent of the pronoun those?

Sentence: Those are books that need to be returned to the library

Answer:

Books

Pronouns are used to replace nouns with more general terms that don't describe a specific person or place. The antecedent of a pronoun is the word that the pronoun replaces.

In the case of this sentence, the pronoun those replaces the word books, therefore the antecedent of the pronoun those is books.