why not 后跟do 还是doing?

why not 后跟do 还是doing? why not +doing还是do why not do sth 还是doing sth Why not 后面+doing 还是to do? why not to do 还是why not doing 是why not do sth.还是why not doing sth. why not to do还是why not doing why not doing sth还是why not do sth还是why not to do sth why not后加do还是doing还是to do? warn sb后跟to do 还是doing stand后跟to do还是doing? suggest 后跟to do还是doing 形式? love sb后跟to do 还是doing 介词后跟to do 还是doing? just后跟to do还是doing still后跟doing还是do的形式 spend后跟to do还是doing refer to 后跟 do 还是 doing