Must and Have to for beginners
'Have to' and 'must' have the same meaning and are used to express obligations. However, they are used in different situations and are not interchangeable.
The Modal Verb Must
We use 'must' to talk about rules and obligations in the present.
Structure
Typically, the base form of the verb is used after 'must'.
Negation
The negative form of must is 'must not' or 'mustn’t'. But keep in mind that in modern everyday English, 'mustn't' and 'must not' are not commonly used.
You
They
These sentences are both rather formal and we normally use 'shouldn't' or 'should not' instead.
Warning
Do not use don’t/doesn’t/didn’t with 'must.'
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