Verified answer

1 You mustn't believe everything people say.

2 You mustn't be unkind to little children.

3 You mustn't smoke.

4 You mustn't eat at the theatre.

5 You mustn't leave the door open.

6 You mustn't be rude to people.

7 You mustn't cheat in the exam.

8 You mustn't forget to say "thank you".

9 You mustn't take other people's things without asking.

10 You mustn't listen to such loud music.

11 You mustn't leave your home without a mask.

12 You mustn't draw on the walls.

13 You mustn't throw litter in the street.

14 You mustn't eat noisily.

15 You mustn't be late for school.