needn't 是情态动词,用于任何时态.
children won't need to go to school in a hundred's years. (need是实意动词）
children needn't go to school in a hundred's years. （need是情态动词）
两句话都可以.
needn't用在什么时态?顺便问下 翻译“一百年后,孩子们将不用去学校”这里是用 needn't还是won't nee
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