The interrogative determiners are: what, which, whose
| Whose | iPad did you use? |
| car keys are these? | |
| What | stupid man told you that? |
| books did you read? | |
| Which | red pen do you want? |
| three teachers do you prefer? |
Whose means "belonging to which person": They didn't know whose car it was.
What is for asking for information specifying something: What time did you arrive? I wonder what reason he gave.
Which is for asking for information specifying one or more people or things from a definite set: Which table would you prefer? I wonder which teacher told him that.
Like all determiners, interrogative determiners come at the beginning of a noun phrase, so they come in front of any adjective(s).
Look at these example sentences:
- Whose iPhone was stolen?
- He couldn't remember whose car keys they were.
- What idiot told you that?
- I don't know what non-fiction books he was reading.
- I asked them which Italian car was best.
- Which nightclubs on the Champs Elysées did you go to?
2. Note also that there is NO apostrophe (') in the determiner whose . The contraction who's (meaning "who is" OR "who has") sounds exactly like whose and even native speakers frequently confuse the two.
I wonder whose dog that is.
Peter, who's not here, is Thai. (who is)
Marie, who's just left, is French. (who has)
sources : Original Link