是why bot do sth.还是why not to do sth.

是why bot do sth.还是why not to do sth. 是why not do sth.还是why not doing 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 do sth 还是doing sth why not doing sth还是why not do sth还是why not to do sth why not 是加to do sth. 还是 动词原形 wh- to do sth =什么 must 后面是加to do sth.还是do sth. 是should to do sth 还是 should do sth? 是can to do sth.还是can do sth. 是had better do sth还是have better do sth it 后面动词是do sth.还是to do sth. 是take action do sth还是to do sth? try one's best 是to do sth还是doing sth还是do sth 是want to do sth and do sth还是want to do sth and to do sth? 是mind to do sth还是mind doing sth?