why not后面是doing sth还是 to do sth

问题描述:

why not后面是doing sth还是 to do sth

why not do sth 才是对的。

Why not do sth.Why not 是 Why don't you 的简单形式,所以既然有了助动词do,后面的动词应用原型.
Why not do sth= How about doing sth .