Please help me on this:
I am not sure whether it is correct or not when rewriting the sentence: "I am sure they were not aware of the consequences." into "They CAN'T HAVE BEEN AWARE OF THE CONSEQUENCES". (I have read it at Rephrase - English). To me, it should be as follows :
They could have been aware of the consequences.
Could you please explain it in details? Thanks in advance.
They could not have been aware of the consequences.