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Whose allows us to ask whom an object belongs to. It is an interrogative adjective and is followed by a noun:
Whose pen is this? - It's mine. To whom does this pen belong? - It belongs to me.
Whose car did you borrow? - Kevin's. Who is the owner of the car you borrowed? - Kevin.
Note 1: Whose is sometimes used as an interrogative pronoun, in particular with be:
Whose is this? To whom does this belong? Who owns this?
Note 2: Whose is sometimes used as a relative pronoun:
Our C.E.O., whose father was a dentist, has a nice smile. The father of our C.E.O., who has a nice smile, is a dentist.
Note 3: We say: Whose car is this? but Whom does this car belong to?.

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