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shoulD/CoulD/must/might hAvE DonE用法?

may/might have done有两个意思: 本来可以干......; 2. 推测过去所发生的事情。例如: You come late again. You may/might have get up early.你又迟到了,你本来可以早一点起床。 He may/might have stayed up last night.昨晚他可能熬夜了。

一、“would+have+done”虚拟语气,表示对过去事情的假设,意思是“本来会做”。 1. I would have told you all about the boy's story, but you didn't ask me. 我本来会告诉你这个小男孩的故事,但是你没有问我。 2. Without your help, I wouldn'...

can have done和could have done有区别。 can't have done和couldn't have done有区别。 1.can+have+done表示对过去行为的怀疑,用于疑问句,译成“可能做过……吗?“ 2.could+have+done是虚拟语气,表示对过去事情的假设,意思是本来能够做某事而没有做...

情态动词+ have +过去分词 1) may(might) have + done sth, can (could) have + done sth 表示过去,推测过去时间里可能发生的事情。 Philip may (might) have been hurt seriously in the car accident. Philip can (could) have been hurt ser...

could have done本来能够做什么,事实上没做 should have done本来应该做 would have done将来可能做 might have done可能做了 1. 很可惜你没做那件事,事实上你能够做的,所以选C 2. might as well 做什么更好,既然我无事可做,还不如跟着你好...

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...

这类词都属于情态动词 下面普及下其用法 情态动词是一种本身有一定的词义,表示说话人的情绪,态度或语气的动词,但不能单独作谓语, 只能和其他动词原形构成谓语. 情态动词数量不多,但用途广泛,主要有下列: can (could), may (might), must, need, ...

情态动词有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等。 情态动词无人称和数的变化;不能单独使用,必须与其后的动词原形构成谓语 一、 can, could 1) 表示能力(体力、...

情态动词所表达的可能性程度:must/can't  should/shouldn't  might/may (not) 另外两个"类情态词的形式:"need/needn't; have to/don't have to  最自然的虚拟状态:由should/would+原型时态(不含时间只含状态) 本质...

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