May:
1. May I go out ?
2. May I close the window ?
3. You may go to the cinema now .
4. You may not wear your uniform.
5. You may play computer games now.
Must:
1. You must do your homework.
2. You must drink tea.
3. I must stay at home.
4. You must arrive on time.
5. You must use a knife and fork at mealtimes.
Mustn't:
1. You mustn't eat with your hands.
2. You mustn't late to school.
3. I mustn't go to bed late.
4. You mustn't play computer games.
5. You mustn't copy your friend's homework.