The Modal Verb Must
The modal verb 'must' is used to talk about rules and obligations in the present.
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.
Example
You mustn't disrespect your parents.
They must not forget their duties.
These sentences are both 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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