why not do sth全句是 why shall we not do sth

why not do sth全句是 why shall we not do sth why not do sth why not +do sth 简单英语造句1、shall we do (sth.2、let's do (sth.).3、why not do (sth why not doing sth还是why not do sth还是why not to do sth why not to do sth对吗?waiting why not do sth ?的用法 why not do sth sb放哪? 用"why not do sth"造句 why not do sth?怎么回答 why do not do sth与why not do sth有什么区别? Why not doing sth.make sb.to do sth.