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the old man needs our help,doesn't he?

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the old man needs our help,doesn't he?
doesn't he?为什么不是needn't he?
还是分情况
the old man needs our help,doesn't he?
用doesn't he
这里need是实意动词,反义疑问句用 don't,doesn't didn't
如果need是情态动词,那么用needn't
再问: 如何判断是实义动词还是情态动词呢?
再答: 情态动词 没有人称变化, 否定直接+not, 后面跟动词原形 实意动词, 有人称变化, 否定 在前面+dont' doesn't , 后面+to do..
再问: 能否举个例子?人称变化是指?
再答: He needs a book. need 加了S, 就是人称变化 Need he go there? need没加S, 是情态动词!