2. You mustn’t be late.

3. You must keep the
board clean.

4. You must be quiet.

5. You must listen to
the teacher.

6. You must raise your
hand before talking.

7. You mustn’t make noise.

8. You mustn’t fight.

9. You mustn’t run in the
corridor.

10. You mustn’t cheat in
the exam.

11. You must do homework.

12. You must be kind to your
friends.

13. You must cooperate.

14. You must take notes.

15. You must share things.

16. You mustn’t spit.

17. You mustn’t eat
in the class.

18. You must bring books.