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Modals

Reminder :
1- We use affirmative forms of 'must and have to' to express obligation.
Example : You must start from here. Do I have to start from here ?
2- We use "must not / mustn't" to express prohibition.
Example : You mustn't switch on the computer before quiting the program.
3- We use need not /needn't and don't/doesn't have to to say that there is no obligation to do something.
Example : You needn't/don't have to send a message, just call them.
Note : There is not past form of must. We use had to and did not/ didn't have to to express obligation and absence of obligation in the past.
Example : I missed the bus yesterday. So I had to walk to school.

Fill the sentences with " must" or " mustn't " in the right form.

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1. You park your car here. You will be fined if you do.

2. Peter wear a tie to go to the office, which really annoys him.

3. Mark, you do your homework immediately or I will get really angry with you.

4. You eat so much junk food. it's bad for your health.

5. I phone Paul tonight; it's been a long time since I last spoke to him.

6. People fish in this river; it's polluted and it could be dangerous if they caught a fish and ate it.

7. You obey the school rules if you don't want to get into trouble.

8. I want you to tell me the truth. You lie to me or I won't be able to help you.

9. If you are allergic to pollen, you have flowers at home.

10. We play better. It's very important for us to win the match today.

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