what not do 和what don't you的区别

问题描述:

what not do 和what don't you的区别
是在用法上的区别!

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?