问题描述: why 否定的用法 why not 是不是等于why don't? 1个回答 分类:英语 2014-10-07 问题解答: 我来补答 有区别Why don't 后加人称、谓语,Why not 后直接加动词.如:Why don't you take a bus?Why not take a bus? 展开全文阅读