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Modal verb : must / have to - English lesson

Must is a modal auxiliary.

It can be replaced by 'have to':

Future : He will have to work hard if he wants to pass his exam.

Present perfect: She has had to hurry up.

We can use 'have got to ' in a more familiar language or for limited actions:

I have got to buy some bread. (only today)

I have to buy bread on my way home. (everyday)

Use

Obligation:

He must work hard if he wants to pass his exam.

Deduction:

She is late; she must have missed her bus.

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1. He says he had tomustwill mustI don't know finish his homework by tomorrow.

2. Kate's line is engaged, she will have tohas tomustI don't know be talking to her mother.

3. My mother told me I will mustmusthadI don't know not forget to buy some bread.

4. He is in a hurry with his work; he musthas towill mustI don't know give the report by tomorrow morning.

5. You don't havemust havemustI don't know to cook all the cakes Tom, there are still a lot of them in the kitchen.

6. I can't hear Tim any more, he has tomusthave toI don't know be asleep.

7. If they want to buy a bigger house next year they had hadwill mustwill haveI don't know to save money.

8. The washing-machine has been repaired, we musn'tmustdon't haveI don't know to buy a new one.

9. You musn'tmussn'tmustn'tI don't know cross the street, the traffic light is still green.

10. I know what happened ! He must forgethas to forgetmust have forgottenI don't know it was my birthday.