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Modals of obligation
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They can swim very well. They ... learn how to swim.
 
don't have to
 
mustn't
 
need to
 
doesn't need to
He ... practise a lot.
 
must
 
have to
 
doesn't need to
 
need to
He ... work any longer.
 
doesn't need to
 
needs to
 
don't need to
 
mustn't
That joke ... be really funny
 
must
 
have to
 
need to
 
mustn't
What does he need to do?
He needs to learn how to ride a bike / He needs to buy a new bike.
What does the baby need to do?
He needs to sleep.
What does he have to do?
He has to / must buy some food; He must go shopping.
What does he have to do?
He has to / must be careful when crossing the street.
What does she have to do?
She has to / must throw away the milk; She must buy some milk.