Interrogatives are words which ask content questions i.e. which require a specific piece of information. They can be subdivided into three categories:
[1] Interrogative adjectives modify a noun. They ask
a question about people or things, but seek specification as to which of two or
more are being referred to.
- Which book are you reading? [i.e. books have already been mentioned and the speaker wants a book to be specified]
- Whose bag is that?
- What kind of music do you like?
- Which players were chosen for the team?
[2] Interrogative pronouns are used to form questions
about people or things which are generally unknown i.e. there is no
antecedent.
- Who are you going with?
- Whose is that?
- What are you doing?
[3] Interrogative adverbs ask a question about an action,
not a person or thing.
- Why did you do that?
- Where did you go?
- How can we get there?
