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The word mightn't is a contraction, a shortened form of the auxiliary verb 'might' and the adverb 'not'.

'Might not' is most commonly used to express negative possibility:

Sandy might not have taken the bus.

Sandy mightn't have taken the bus.

A noun is a word for a person, a place, or a thing.

The words 'Sandy' and 'bus' are the nouns in the example sentence. The noun 'Sandy' is a word for a person; the noun 'bus' is a word for a thing.

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10y ago

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