We use who to ask questions about people:
Who is that?
Who lives here?
Who did you see?
We use whose to ask about possession:
|Whose coat is this?
|Whose is this coat?
|Whose book is that?
|Whose is that book?
|Whose bags are those?
Whose are those bags?
We use what to ask questions about things:
What is that?
What do you want?
We use which to ask someone to choose something:
Which came first, the chicken or the egg?
I've got two books. Which do you want?
We can also use what and which with nouns:
What subjects did you study at school?
What newspaper do you read?
Which newspaper do you read – The Times or The Guardian?
Which book do you want?
Which one is yours?
- Pronouns in questions 1
We often have a preposition at the end of a question:
Who does this book belong to?
What are you looking for?
Which university did you go to?