究竟can't have done与could't have done有什麼分别?

究竟can't have done与could't have done有什麼分别? can't have done与could't have done的区别 can have done和could have done有无区别?can't have done和couldn't h could't have done和can't have done的区别 有没有can have done sth?could have done sth有两种意思吗?can't/couldn' musn't have done can't have done can't be done.should be done.should have done should have done ,shouldn't have done.could have done,couldn couldn't have done? wouldn't have done could't do 和could't have done还有could do,could have done的区别和用 can have ddone 与could have done 的区别在于?