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The word mustn't is a contraction, a shortened form for the verb (or auxiliary verb) 'must' and the adverb 'not'. The apostrophe takes the place of the missing letter 'o'. The contraction functions as a verb (or auxiliary verb) in a sentence. Example:

We must not be late for school. Or, We mustn't belate for school.

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Q: What part of speech is musn't?
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