In fact,you did not know they could have been

问题描述:

In fact,you did not know they could have been

事实上你并不知道他们本应该.....

实际上,他们可能已经...

事实上你不知道已经能够。。。。。。

事实上,你并不知道他们可能已经。。。。。。

事实上,你不知道他们本来能够...
could have是本来能够.(事实上没有做到)