1, 含有be动词：把be动词调到句首大写，句末加问号。例如：
You are a student. 变为：Are you a student?
He was a baby many years ago. 变为：Was he a baby many years ago?
2, 含有情态动词的把情态动词调到句首大写，句末加问号。例如：
You can speak English. 变为：Can you speak English?
He could run very fast. 变为：Could he run very fast?
3, 谓语是实义动词的一般现在时要在句首加助动词do或 does，谓语动词要用原形。一般过去时要在句首加助动词did，谓语动词要用原形。例如：
He goes to a school every day. 变为：Does he go to school every day?
They went to the cinema last night. 变为：Did they go to the cinema last night?
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