„mustn't“ oder „needn't“ ein.

1 The students forget the homework.

2 I take the book. I'm not going to learn.

3 I cross the street. There are no traffic lights.

4 You be late at school .

5 You buy it if you don't want to.

6 You show the results to anyone. It is forbidden.

7 We hurry. The train is late.

8 You smoke in a hospital.