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We need to come up with some ideas

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We need to come up with some ideas
请问这个句子变成否定句是在need后加not还是在前边加don‘t?为什么?
We need to come up with some ideas
need 在这里是行为动词,所以需要助动词 don't
改为:We don't need to come up with any ideas.
不明白的再问哟,请及时采纳,多谢!
再问: 那请问这道题呢 You ____go to his house. 是选don't need,needn't to 还是needn't呢? 应该怎么判断是实意动词还是情态动词呢?
再答: needn't 这里是情态动词,后跟动词原形 go