Interrogative pronouns

Interrogative pronouns are pronouns that are used in asking questions. The interrogative pronouns are: who (whose, whom), which, what. An interrogative pronoun also has another function to perform in the sentence, just as any other pronoun has. It may be the subject of the sentence, or it may be the object of the verb or of a preposition .

Who is the manager of this firm?

For whom are you waiting?

Which is your bag?

Whose bike did you borrow?