why not是否等于why don't we?（why not后面用加together吗)

why not是否等于why don't weRT 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？ why not是否等于why don't we?（why not后面用加together吗) why don't是不是等于why you not? Why don't you+...why not +. why don't和why not why 否定的用法 why not 是不是等于why don't? why don't we =why not 还是why don't you=why not why don't you可以等于why not.那why doesn't he可以等于吗?为什么! why don’t you=why not还等于什么?两个空!麻烦大家答答. why not do sth.=why don't you do sth.还等于什么 why not等于why()() 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 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?