She is so tired .
She must has been working all the morning.
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must have done与must have been doing区别
第一个就是对过去事实推测 must have been doing 其后的be doing 表示进行 我们知道must have done 是对过去 那么must have been doing就是过去进行咯 就可以理解为过去一直发生的事情 举个例子 You must have been driving too fast 你肯定一直在超速 表示过去一直 再举个must have done 的例子...
must have been doing的用法
must has been working all the morning.她很疲劳了 她一定工作了一个早上 must have been doing 表示肯定的猜测 并且猜测这种动作,或者行为一直持续到现在
must have been doing的用法
must have been doing 表示肯定的猜测 并且猜测这种动作,或者行为一直持续到现在
must have been doing
must have been doing意思是 一定一直都在做某事She is so tired .She must has been working all the morning.她很疲劳了她一定工作了一个早上。must have been doing 表示肯定的猜测 并且猜测这种动作,或者行为一直持续到现在 还有must have been done是must have done的被动形式。是对过去发生的动...
must be doing 与 must have been doing
.must be doing:肯定某人正在做某事..He must be doing his homework.他一定在做他的作业 must have been doing:肯定某人一直在做的事..He must have been trying his best to study..他肯定一直都在尽力学习..must表强烈的肯定，shall不那么强烈，could最弱..表推测的情况一般不用can ......
must have done和must have been doing的区别
must have +done must have+ been doing 都知道be doing 表示正在进行的动作,正在发生的,那要放到must have done里面去,则要符合“done”的这中过去分词的形式,则就变成了must have+been doing 拉,有一直发生的意思,整个意思就是“表示对过去一直发生的事情的推测”.如：Tom must have been playing...
must have done和must have been doing的区别
must have +done must have+ been doing 都知道be doing 表示正在进行的动作,正在发生的,那要放到must have done里面去,则要符合“done”的这中过去分词的形式,则就变成了must have+been doing 拉,有一直发生的意思,整个意思就是“表示对过去一直发生的事情的推测”.如：Tom must have been playing...
...of ypur mind"have been doing 在这是什么用法”详细点谢谢_百度知 ...
这里涉及两个知识点：1： must have done 句型，这个句型表示对过去事实的肯定猜测，这句话翻译过来就是：我猜想你当时一定是走神了。因此这是对过去某一时刻正在发生的动作的猜测，因此涉及到的知识点是 2：must have been doing 表示对过去正在发生的动作的肯定猜测，结合刚才翻译，就可以理解了 ...
must be和must have been 在句子中作什么成份及其时态?
must be不一定是系动词，后面加doing是现在进行时。must have been 本身可以是现在完成时，后面加doing是现在完成进行时
请问高手 MUST have been done
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 ...
