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• An interrogative pronoun is a pronoun used to introduce a question.

           Who invited me to the party? What do you mean?

           Do not confuse whose with who’s.

           Whose jacket is this? Who’s coming with you?

• A demonstrative pronoun is a pronoun that points out something. This, these, that, and those are demonstrative pronouns.

            That is my coat on the chair. Those are my research findings.

             This and these refer to something nearby; that and those refer to something at a distance.