why------you buy some fruit 为什么

问题描述:

why------you buy some fruit 为什么

why don't you buy some fruit?
应该是填don't
原因:
有why了,是问句,问原因
这里就有两个选择:do 和 don't
再看后半部分
如果是do的话,应为: why do you buy these(或其他词) fruits?
所以根据句意
应该是why don't you buy some fruit?
你为什么不买点水果呢?

why (do) you buy some fruit