It can't have been my new hat.这样的一句句子,没有上下文,怎么分辨它是过去完成时,还是现在完成时啊?新概念第一册130课那么It must have been my dog呢？

用can't have been造句! 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 This is the very book that I'm looking for.Where did you pick it ___[A.out B.up]2.I can't have seen a ghost.It must have been ____[A.imaginative B.imagination] I think she was old.我认为她原来是老的?I don't think she was.She can't have been old.She must have been young.这怎么翻译I think it was cheap.I don't think it was.It can't have been cheap.It must have been expensive.同上.最好将语 求助翻译what can i do!I haven't slept at all in days It's been so long since we've talked And I have been here many times I just don't know what I'm doing wrong What can I do to make you love me What can I do to make you care What can I say to ma 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与couldn’t have been的区别? 英语翻译I haven't slept at all in days It's been so long since we've talked And I have been here many times I just don't know what I'm doing wrong What can I do to make you love me What can I do to make you care What can I say to make you feel th They _____ about it,I'm sure they didn't know.A.must have knowB.mustn't knowC.can't have knownD.can't know Do you still remember the day when we went to the Great Wall?I can't remember it well,but____sometime last autumn?A.might it be B.could it have been C.could it be D.must it have been You Can T Have It 歌词 给我说一下这些题的答案( )1.He said that he _____ to Canada a few years ago.A.had been to B.have been to C.went D.go( )2.—Can’t you stop making so much noise?I really can’t _____ it.—I’m terribly sorry for giving you so much troub 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