1. It's raining outside. Tim has to take his umbrella. (x)

has ⇒ must

2. I can give you a hand. So you mustn't do it alone. (x)

mustn't ⇒ don't have to

3. They mustn't be hurry because the film starts late. (x)

mustn't ⇒ don't have to

4. You must stop at the red light. (v)

5. Tomorrow is Monday but I mustn't go to work. (x)

mustn't ⇒ don't have to

6. I am short-sighted so I must wear glasses. (v)

7. You mustn't smoke here. There are a lot of children around you. (x)

mustn't ⇒ must

8. Everyone have to bey the school's rules. (x)

have to ⇒ must

9. It is warm today so we mustn't wear thick coat. (x)

mustn't ⇒ needn't

10. My father will buy me a bike so I don't have to walk to school any more. (v)

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1, v

2, x: mustn't=>needn't

3, x: mustn't=>needn't

4, v

5, x: mustn't=>needn't

6, x: must=>have to

7, v

8, x: have to=>must

9, x: mustn't=>needn't

10, v