Interrogative Pronoun | Question | Grammatical Function |
who | Who's on first? | The word who is the subject of the sentence (subjective case). |
whom | Whom should we call? | The word whom is the object of call (objective case). |
whose | Whose turn is it? | The word whose is the possessor of the noun turn (possessive case). |
which | Which runner won the race? | |
what | What time is it? |
© Grammar.com