why don't ,why not & why not do 答题的时候用在什么情况?

Why don't you+...why not +. why don't和why not why don't we =why not 还是why don't you=why not why don't you与why not的区别 why don‘t you和why not的不同用法 why don't是不是等于why you not? why not是否等于why don't weRT why don't you do=why not doing why not与why don't怎么用?怎么区别 Why not和 why don't后面怎么接动词 Why not,Why don't.有什么区别? Why not do 和 Why don't do 什么区别 why not 和why don't 有什么区别啊! why not 同义词是 why don't you 还是 why don't you do why not可以=why don't you可不可以=why don't we/they. 有关why not的用法why not是否等于why don't we?why don't we是不是不常用？ ----come to the Party early A why not to B why not C why don't why not是否等于why don't we?（why not后面用加together吗)