You need to wear warm clothes,_______?反义疑问句为什么是 don't you?不是needn't you
问题描述：
You need to wear warm clothes,_______?
反义疑问句为什么是 don't you?
不是needn't you
答
这个句子里的need是实义动词，构成否定句和疑问句时需要借助do或者does。只有在need是情态动词时，否定时才直接加not。区别是need to do用法时是实义动词，情态动词只有一种用法，和can，could等一样，只能直接跟动词原形。记住就行了。
答
这里 need to 有了to need就不是情态动词了,所以反义疑问句是 don't you
如果you needn't wear warm close,need you?
need做情态动词一般出现在否定疑问句.