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

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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

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