why not do还是why not to do?
why not sb +do还是to do
why not doing sth还是why not do sth还是why not to do sth
why not to do 还是why not doing
why not do还是why not doing?
Why not 后面+doing 还是to do?
why not +doing还是do
why not后加do还是doing还是to do?
why not后面到底是to do还是do?
那个语法是why not to do Sth还是why not do Sth
是Why not to do sth还是Why not do sth?
why not do it
why not do sth