can’t have been与couldn’t have been的区别?

can’t have been与couldn’t have been的区别? 用can't have been造句! 英语翻译you don`t care for me,you don`t carry where i have been,i`ve done all i could,so that i could be with you.anyway you want,i do everything you need,maybe now you can see,that our love was went to be.but i was so wrong,always thought i coul 英语翻译A.can't have been B.mustn't have been C.shouldn't have been D.wouldn't have been can't have been和must have been每一个的用法 She can't have been Danish. and She must have been Swedish. be,must be,can't have been,must have been吗 must have been和can't have been和现在完成时有没有联系啊 用must have been/done或can*t have been/done 改写句子 can't have been和can' have done有什么区别或者must have been和must hane done;may have been和may have done you can have been he can't haue been a dcntist.he must have been a doctor.翻译下 He can't have been.He must have been.不是说单三用has吗?这里怎么用的have? 情态动词的过去式主要是关于COULD的You______ him at the party last night.(CAN'T SEE不能表示过去么?)能不能用COULD'NT SEE作为CAN表猜测时候的过去式 就不一定要用CAN'T HAVE SEEN了情态动词没有过去式么?COUL can't have been,must have been 结构里是不是不要把have been当现在完成时看,就把它当成一个结构来使用? They can't have been doing their homework请问can't have been是对刚才所发生的事的推测吗? The room is in a terrible mess,it ___ cleane;a、can’t have been b、shouldn’t have beenc、mustn’t have been d、wouldn’t have been She seems to know nothing about the accident.She ____ been here.(can't have,mustn't have).二选一