请问：有没有must have been?

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请问：有没有must have been?
请问：有没有must have been?

请问：有没有must have been?
有must have been
翻译为：一定（对过去事实肯定的推测）
例句
1.He must have been working hard these years.
这些年来他一定是非常努力的.

有，此短语为情态动次表推测，在一般的情态动词专题中经常出现。 例如： What did Bill do during the holiday? I think he must have been doing some cleaning in an restaurant.

对于过去事实的推测，（主语+must+have+过去分词）must表示推测的句子中，一般都用肯定句，它的肯定程度比may,might 大得多
eg：I didn't hear the phone .I must have been asleep希望帮到你，写了好久，呵呵

请问：有没有must have been? must have been和can't have been和现在完成时有没有联系啊 有没有have been doing 这个时态?must have been doing呢? must have been请问 must have been 是推测某人一直在做某事吗? must be和must have been有什么区别he must have been sleeping.为什么这里要用must have been而不用must be must have been doing与must have been done都表示推测,有什么区别呀? must have been done must have done must have/ must have been的区别 英语：助动词的问题he must（can't may等） have been asleep,就有两个助动词,must ,have,很少见哦,还有没有其他的情况 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 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 有must/could/can/may/maight have been done吗 英语中,must have been 和 must have +过去分词,有什么区别如题 有没有must have to 这个词? Sam was sure that the wallet must have been found by one of the villagers...请问been和found冲突吗?怎么有两个谓语动词? He might have been a policeman,wasn't he?Mr Green must have been punished for his being rude at yesterday's meeting,didn't they?请问这两句都是对过去情况的推测而且谓语部分有情态动词+have+done也没有表示过去的时间状 请问一下have been to和have been in和have been at有什么区别? 请问have been 和has been有什么区别