對於be動詞，情態動詞還有助動詞它們的排列順序首先情態動詞和助動詞一定是會排在be動詞之前，如果說句子中只有三者中的一個表示疑問的時候，都是要在舉手表示陳述語氣的時候都在主語之後。

be動詞，情態動詞，助動詞do/does的用法區別及練習

1. 由連繫am，is，are構成的句子：變一般疑問句時把am，is，are提到句子的前面，句尾用問號即可。變否定句時直接在am，is，are後面加not即可。例如：

肯定句:He is a student.

一般疑問句: Is he a student?

否定句: He is not a student.

畫線提問: 對he提問: Who is a student?

對 a student 提問: What is he? or What does he do?

2. 由情態動詞can, may, should等構成的句子: 變一般疑問句時把can,may,提到句子的前面,句尾用問號即可.變否定句時直接在can,may,後面加not即可. 例如:

肯定句: She can swim.

一般疑問句: Can she swim?

否定句: She can not swim.

畫線提問: 對she提問: Who can swim?

對swim提問: What can she do?

3. 由行為動詞構成的句子: 需要加助詞do或does. 變一般疑問句時把do/does放在句子前面. 變否定句時把don’t/doesn’t放在動詞的前面。要注意觀察動詞的形式並對號入座。一般疑問句和否定句的動詞三單式都要變回原型。

play-----do plays-----does

例如:

肯定句: They play football after school. He plays football after school.

一般疑問句: Do they play football after school? Does he play football after school?

否定句: They don't (do not) play football after school. He doesn’t’ play football after school.

畫線提問: 對they/he提問: Who plays football after school?

對play football提問: What do they do after school? What does he do after school?

對after school提問: When do they play football? When does he play football?

Be動詞通常放在情態動詞後面，比如這本書不可能是他的the book can't be his.助動詞和be動詞放一起的話，助動詞要放在be動詞前面。比如在現在完成時代裡面，他已經去過杭州，he has been to Hangzhou .has 放在been的前面。情態動詞和助動詞一般不能同時放在一起。