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I don't know where to go next summer. I ____________ go to London.
have to
should
must
may
We use the modal verb 'may' when it is possible that something will happen.
My car is too dirty. I ______________ clean it immediately.
might
can
must
may
We use the modal verb 'must' when we talk about duties or when it is necessary to do something.
He is a good sportsman, but he ______________ stop smoking.
may
can
might
should
We use the modal verb 'should' when we give advice or recommend something.
It's very cold outside. We __________ put on warm clothes.
can
could
may
have to
We use the modal verb 'have to' when it is not our idea to do something, when we are forced to do something by somebody or by circumstances.
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