Pic of someone diving into a pool ESL Using Must,
Blues Have to

Both must and have to can be used to say that it is necessary to do something.
Must, like other modal verbs (may, should, can, etc), is followed by the verb alone (without 'to').

Common Error: You must to get up early.

Careful:  Must not  does not have the same meaning as  don't have to.

Must not is a polite way to say 'Don't!' Don't have to means 'It is not necessary.'

Common Error: You mustn't get up early on the weekend. You can get up when you want.

With the meaning 'It was necessary' the past tense of both have to and must is had to.

Common Error: You must get up early yesterday.

Use have to, not must after 'will,' 'may,' 'might.'
Must, but not have to, can express the idea: 'I suppose that...'

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