是Why not to do sth还是Why not do sth?

why not后面是doing sth还是 to do sth 是Why not to do sth还是Why not do sth? 那个语法是why not to do Sth还是why not do Sth why not doing sth还是why not do sth还是why not to do sth 是why not do sth.还是why not doing sth. 是why bot do sth.还是why not to do sth. why not 是加to do sth. 还是 动词原形 why not do sth 还是doing sth why not to do sth对吗?waiting 是ask sb not to do sth 还是ask sb to not do sth 是tell sb.not do sth.还是tell sb.not to do sth.那么ask呢? 最好不做某事是had better not do sth 还是had better not to do sth why not do sthwhy not to do sthwhich is right 关于not的句型(急用)是not doing sth还是not to do sth还是not do sht why not do还是why not to do why not sb +do还是to do why not to do sth 这个结构对吧? why not to do 还是why not doing