1
You use this to ask about quqntity (countable)
2
You use this to ask about amount, price (uncountable)
3
You use this to ask about choice
4
You use this to ask about place
5
You use this to ask about time
6
You use this to ask about reason
7
You use this to ask about person
8
You use this to ask about object, idea or action
9
You use this to ask about manner
