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1. Children have to/should help their parents.

2. Should/May I come in?

3. All passengers can't/mustn't use their mobile phones.

4. Everybody can/must learn a foreign language.

5. You don’t need to/mustn't smoke here.

6. You mustn’t/don't have to come with us if you don't want to.

7. You don’t need to/mustn’t be very rich to go skiing nowadays.

8. I think you should/can go out more and meet new people.

9. You must/need to have a visa before travelling to the USA. It’s the law.

10. I am young. I should/can run for miles.​