Why not do 和 Why don't do 什么区别
问题描述：
Why not do 和 Why don't do 什么区别
答
意思是一样的,但用法有点差别 why not 后面直接接动词原形.why don't 后面要先接主语（即名词或代词） 才可以接动词原形.举例 why not come ealier?等于why don't you come earlier?