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Interrogative adjectives and pronouns

For persons:   subject                who (pronoun)

                    object                  whom, who (pronoun)

                    possessive           whose (pronoun and adjective)

For things:      subject/object       what (pronoun and adjective)

For persons or things when the choice is restricted:

subject/object       which (pronoun and adjective)

The same form is used for singular and plural.

what can also be used for persons

Affirmative verb after who, whose etc. used as subjects

who, whose, which, what when used as subjects are normally followed by an affirmative, not an interrogative, verb:

Who pays the bills? (affirmative verb)

Whose/Which horse won? (affirmative verb)

What happened?/What went wrong? (affirmative verb, possible

answers: We missed the tram/had an accident.) But with who, whose etc  + be + noun or personal/distributive pronoun, an interrogative verb is used:

Who are you?       Whose is this?       What is that noise? With who, whose etc. used as objects of a verb or preposition an interrogative verb is, of course, necessary.