作业帮 > 英语 > 作业

MUST have been done

来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/22 14:52:59
MUST have been done
must 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 been alseep
其实must have been done只是must have done的被动形式罢了.
我说,你举出来的那几个例子：1那个就是must have been doing的结构是指某动作在过去某时间点开始,一直持续到现在,有继续持续下去的趋向,或者等这句话一说完这个动作就完成；
2那个是加形容词 be expensive=很贵,must have been expensive= 一定是很贵的了.
3那个asleep也是形容词,be asleep=睡着的.句子意思是：那时我一定是睡着了.（表示对过去肯定的推测）
MUST have been done must have been done must have done must have been done/must be done must have been done是什么被动语态 must have been与must have done的区别? can be done was done could be done must have been done will 用must have been/done或can*t have been/done 改写句子 用（can't ） （ have been/done ） （must have been /done） 改写句子 用can't have been/done must have been /done 改写句子 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 could/should/must/.加have done和have been done区别