3.1 Complete these sentences with must, mustn't or the correct or the correct form of have to.
1. At our school wewear a uniform.
2. You cross the roads without looking. It's dangerous.
3. You turn on the central heating. It's automatic.
4. The exams are next week. I work harder.
5. You forget your umbrella. It's going to rain.
6. Students listen to the teacher or they won't understand.
7. You cross the road when the red light is showing.
8. Weleave now or we'll miss the plane.
9. Soldiers obey orders.
10. Sorry, I go now. I don't want to be late.
11. Shop assistants deal with the public.
12. You come with us if you don't want to.
13. I was late this morning because I wait a long time for the bus.
14. In Spain, teachers wear uniforms.
15. You take food in your room.
1. Must
2. Mustn't
3. Don't have to
4. Have to
5. Mustn't
6. Must
7. Mustn't
8. Have to
9. Must
10. Have to
11. Must
12. Don't have to
13. Had to
14. Must
15. Mustn't