4 It seems that she was here last week.-------------------She seems to HAVE BEEN here last week.

问题描述:

4 It seems that she was here last week.-------------------She seems to HAVE BEEN here last week.
5 It seemed that she knew everyone there--------She seemed to KNOW everyone there.
为什么这样变

It seem(s)/ed that +句子可以和
Sb seem(s)/ed + to do 可以进行同义替换呀