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The word mustn't is a contraction, a shortened form for must not.
The word 'must' is an auxiliary verb and the word 'not' is an adverb used to modify the verb.

Examples:
You must not disturb grandma while she's napping.
You mustn't disturb grandma while she's napping.

You must not be late for rehearsal.

You mustn't be late for rehearsal.

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10y ago

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