Why don't do sth和 why not do sth有什么区别?

Why don't do sth和 why not do sth有什么区别? Why not do sth.=Why don't you do sth.=什么? why not do sth.=why don't you do sth.还等于什么 why don,t sb do sth同意句 don't you do sth=why not do sth造句,词组造20句子, Why not do 和 Why don't do 什么区别 don't have to do sth 是否等于don't need to do sth 和needn't do sth 请问：这两种说法有什么区别?一个是Why don't you do sth.一个是Why do you not to do sth.还有How could you not to do 和 How couldn't you do why not do sth why not do sth 例如:why don't sb do sth 是七种喔快点想出几种就报上几种 22题,不是有why not to do sth why don't you do sth22题,不是有why not to do sth why don't you do sth 的句型么? 英语造句急!why not do sthwhy don't you do sth why i don't like my job?为何不是why don't i like my job?那Why don't you do sth？ 关于Why的否行提问我最初认为是Why don't sb do sth和Why not do sth 但老师今天好像说了个Why don't do sth昨天的一个问题简直是神速,今天呢,我充满信心 Don't do sth.和Don't forget to sth.的答句 与Do sth.和Remember to sth.有区别吗,请详细列举,谢谢是Don't forget to do sth.和Remember to do sth. why don’t you （to）do sth 中的to用加不 why don't you do sth中的you是什么物主代词, Don't try to do sth.和 Try not to do sth.有什么区别? I don't know可以说成don't know吗?在语法上正确吗?don't do sth和sb don't do sth如何区别?