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must hAvE BEEn DonE

must have done和must have been doing的区别: 您好。两者都是表示肯定的推测。 must have done:是说你肯定做了某事。 must have been doing:译为肯定当时正在做某事,只有意思的区别。

must表推测时 must do 和must have done的区别 must表推测时 : 必定,一定 The light is still on, so he must be at home. 灯还是亮的,他一定在家。 The light was out. They must have gone to bed. 灯都熄了,他们必定睡了。 注意:1. must...

must have done 是对过去发生的动作最有把握的猜测,意思是“一定”,例如:走到门外看到地上湿的,便猜“刚才一定下过雨了”,英语就是 It must have rained. 把握差一点的用should; 例如地上不是太湿,你猜“刚才应该下过雨吧。” It should have r...

动词后+ED和动词后+ING 举个例子,I am interested in the book. The book is interesting.一个以人做主语,一个以物做主语。加ed是修饰人的,而加ing则是令人怎样的形容词。加ed成名词我没听说过。加ing是成动名词吧。说的不好你可以看下面的:...

must have done一定做过(表示过去做过的事对现在的影响) 例:You must have lied.你一定撒谎了。 must be一定是 表示一般的陈述 例:You must be a student.你一定是个学生。 PS:绝对权威!

must have been done 和 must have been doing 是两个不同的概念。have been done 是现在完成时的被动语态,汉义:"已经被⋯"。have been doing 是现在完成进行时,表示动作从过去某一时间开始一直延续到现在。加了must 后可以表示推测。

must have done (过去)准是/一定做过某事 must +have +过去分词 表示对过去某种情况的判断

sb. must have been to 某人肯定已经到过某处 sth. must have been done 主语是被动的,一般为某事肯定已经被做了 sb. must have done 主语是主动的,某人肯定已经做了某事

先说must have done 它指的是一种推测,可能性极大 ,翻译为“一定做过某事了” must do 就是必须做某事 (前面加be就是它们对应的被动形式)

have been doing 从过去到现在一直延续的动作并对现在产生一定影响 完成进行时

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