must have been done是什么被动语态如will be done是一般将来时被动语态,can be done是情态动词被动语态

must have been done must have done must have been done/must be done求解两者异同 must have been与must have done的区别? 他一定是被谋杀的.英语如何说?是用must have been done 用must have been/done或can*t have been/done 改写句子 must have donemust have done 的用法详细说明.可以归结为虚拟语气里面的么?must have been down 是must have down 的被动语态么 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 must have been doing与must have been done都表示推测,有什么区别呀? 有must/could/can/may/maight have been done吗 must have been done是什么被动语态如will be done是一般将来时被动语态,can be done是情态动词被动语态 could/should/must/.加have done和have been done区别 have done 和gave been done的用法last night it must have been rained为什么错 雨是被下的,所以我觉得应该用have been done. MUST have been donemust have been doing must have been +名词must have done以上的区别还有是否有must have been done 的用法 和区别EG1 I must have been sleeping 2 your dress must have been expensive.3 I didn't hear the phone,I must have 不是must做情态动词对过去推测用must have done,又是进行时,用must have不是must做情态动词对过去推测用must have done,又是进行时,用must have been doing么?百思不得其解. She must have been a beauty in her day.这句的have been 怎么理解啊,不懂.have been 不是后面+done 所有的have been. must have done 和must have been 的区别都是对过去的猜测,二者的区别是什么? he must have done it yesteraday,――?he must have done it for 2 years ――?he must have done it yesteraday,――?he must have done it for 2 years ――?he must have been here yesterday――?he must have been here for 2 years――?这几个反 he must have done it yesteraday,――?he must have done it for 2 years ――?he must have done it yesteraday,――?he must have done it for 2 years ――?he must have been here yesterday――?he must have been here for 2 years――?这几个反