疑问句的构成是怎样的？构成疑问句有下面三种方法：

1、“交叉换位法”：句中有个“情助be”，交叉换位靠自己。

2、“添加法”：句中没有“情助be”，考虑添加do/does/did。

3、“保持不变法”：Wh-作主语，保持不变直接书。

例句：

1、I can speak English.Can you speak English?     can是情态动词
He will go to Shanghai soon.Will he go to Shanghai soon?     Will是助动词
He is a teacher.Is he a teacher?     is是助动词
He is eating an apple now.Is he eating an apple now?     is是助动词
He has been to Shanghai.Has he ever been to Shanghai?     Has是助动词

2、I often drink water.Do you often drink water?     添加助动词do
She often drink milk.Does she often drink milk?     添加助动词does
We drank beer yesterday.Did you drink beer yesterday?     添加助动词did

3、英语特殊疑问句构成有哪些形式？特殊疑问句作主语，无需添加任何助动词，如果有，就带上：
Who driver the car?
Who is drving the car?
What happened yesterday?

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