是think to do还是think do 还是think doing

是think to do还是think do 还是think doing think+do还是doing think doing还是think to do 还是都可以? think about 加 to do 还是doing? think about后面是doing还是do? 是THINK ABOUT DO STH,还是 THINK ABOUT DOING STH? think about doing 还是 to do?用法是?为什么? think of后是+ to do还是doing? think about doing还是do 还是什么 think sb do sth还是think sb to do sth think 究竟加 to do sth 还是 doing sth.不是think of 是“what do you think”还是“how do you think”?