think about 加 to do 还是doing?

think about 加 to do 还是doing? what about加doing还是to do think about 后加doing sth.还是 do sth. think about doing 还是 to do?用法是?为什么? think about doing还是do 还是什么 think about后面是doing还是do? 是THINK ABOUT DO STH,还是 THINK ABOUT DOING STH? 是think to do还是think do 还是think doing think 究竟加 to do sth 还是 doing sth.不是think of how about doing还是 to do thinking about doing something还是to do? think doing还是think to do 还是都可以?