3.1 Complete these sentences with must, mustn't or the correct or the correct
form of have to.
1. At our school we_____wear 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. We______leave 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.
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Answers & Comments
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