we don't need to have too much fruit for .为什么用don't need to

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we don't need to have too much fruit for .为什么用don't need to

don't need to do sth= needn't do sth不必(前者是实意动词的用法,后者是情态动词的用法)
need to do sth 需要做某事
need 只有作为情态动词时,后面才接动词原形