情态动词在句子中的作为什么词

1、We must call the police as soon as possible.

2、She may lose her way.

3、My mother may come back.

4、He may well refuse to speak to you,because he's in a bad mood.

5、情态动词可以放在句首，具有助动词作用，可以用来构成否定句，疑问句及用于简单回答。例如：

7、We must stay here.

8、He must stay here.

9、Can I stay with you tonight？

10、May you have a very happy life!

11、Can you finish this project before 3 o’clock？

12、You must play piano three hours in the day.

13、Can you speak English？

14、She may come or she may not.

15、He must finish his homework as soon.

16、Can you sing an English song？