Unit 12
Modal verbs: must, have to, should
Present
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Positive
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Negative
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have to /
don’t have to
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strong obligation (possibly from outside):
Children have to go to school.(sometimes ‘have got to’)
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no obligation: I don’t have to work on Sundays.
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Must / mustn't
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strong obligation (possibly based on the speaker’s opinion): I must study today.
It is used to show that something is very likely:
He must be at home now.
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Negative obligation: You mustn’t smoke here.
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Should / shouldn't
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mild obligation or advice : You should save some money.
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Mild negative obligation or advice: You shouldn’t smoke so much.
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Be careful about the difference between mustn’t and don’t have to!
Mustn’t means it’s not allowed, or it’s a bad idea:
You mustn’t eat so much chocolate, you’ll be sick
Don’t have to means you don’t need to do something, but it’s fine if you want to do it:
I don’t have to get up early at the weekend (of course, if I want to get up early, that’s fine, but I can stay in bed if I want).
Достарыңызбен бөлісу: |
