remain to be seen为什么等于appear/seem to be

remain to be seen为什么等于appear/seem to be 为什么是remain to be seen 而不是remain to see 英语中类似appear to,seem to,tend to这些词是什么词性?后面为什么跟be或动词原型? remain to be settled remain to be 用法 seem to be为什么seem 的后面要加to remain后面为什么跟了to be remain to be done是否等于remain doing?need doing是否等于need to be d 英语seem to be seem to be done several things remain to be seem+形容词和seem to be