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must hAvE DonE

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...

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 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

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...

情态动词+动词完成时,即情态动词+have+done.表示对过去的行为或动作进行推测,评论或者判断. 1.must have done. 表示对过去某事的肯定猜测,其否定或疑问形式都用can/could来表示。 例如:since the road is wet,it must have rained last night....

must表示推测,意思是“肯定,一定,准是”。若推测过去发生的事情,要用完成式,即must+have+过去分词。如: He must have known it yesterday. 他昨天肯定知道这件事。 She must have been ill that day. 那天她准是病了。 I must have done the...

首先have done表示已经做过,这点就不用谈了. can't have done 表示以前不可能做某事. 例句 ---Where____Margaret have put the empty bottles? ---She________them away.They must be somewhere. A.can;can't have thrown B.must;must have thro...

I noticed that he did not wear a watch and realized that he must have lost it on his way home. 我注意到他没有戴手表,意识到他一定在回家的路上丢了。

其实这两个的区别可以这样来推导: *must have done---这个应该知道吧?就是表示对过去的一种推测,接下来就由这个推导下来; 1must have+been doing---把这个和上面的must have +done进行比较,仔细看看比较加号后面的: must have +done must hav...

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