which class are you ni和which class you are in 哪个对?

问题描述:

which class are you ni和which class you are in 哪个对?
我在一本书上面见到which class you are in?和 which class he is in?的用法。所以迷惑中。请帮我查实。

前一个可以是独立的句子,后一个应该只能用在从句中