I'm helping a Chinese woman improve her English. Is there an easy-to-understand rule governing the usage of "which" and "what"? For example, which of the following sentences is correct and why:
1) Which school do you attend?
2) What school do you attend?
Can anyone help? Mormor
'what' is used when you are seeking information, plain and simple.
'which' is used when you are asking for information and there is a specified number of people or things from a definite set to choose from.
'What school do you go to?' is seeking the name of the school he attends.
'You come from Smallville! As I remember, they only have two schools. Which school did you go to?"