1 . You are ill. You should not go to school today.

2 . If you want to work in the USA, you should learn to speak English.

3 . You should not give someone a clock as a present.

4 . Tomorrow is Sunday, so I don not have to go to school.

5 . I think people should recycle more paper and glass.

6. The museum is free. You don not have to pay.

7 . I have to wear uniform when I am at school.

8 . If you see Pauline, you should be polite to her.

9 . You should not smoke. It is bad for you.

10. We have to be on time at the meeting.