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    Learn English > English lessons and exercises > English test #124176: Modals
    > Other English exercises on the same topic: Modals [Change theme]
    > Similar tests: - Modal: may/might - Placement test 1 - Modal can (video) - Which modal and when? - Modal verb : must / have to - Modal : can/could - Must / Have to - Modal verbs
    > Double-click on words you don't understand


    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.

    End of the free exercise to learn English: Modals
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