1
It's used to ask for AMOUNTS
2
It's used to ask for QUANTITIES
3
We use which when there is a restricted range of answers.
4
It's used to ask for PLEACES
5
It's used to ask for TIME
6
It's used to ask for the way the THINGS or SITUATIONS are.
7
It's used for information about things or situations
8
It's used for ask for REASONS
9
Is used to refer PEOPLE
