must have done,must be done

must have done,must be done

must have done是现在完成时态(过去发生的动作对现在造成的影响);had done是过去完成时态(过去发生的动作对过去造成的影响)must have done常与情态动词连用，情must+have done过去一定做了某事（对过去的事情一种肯定的猜测、推测）。如：He said I must have done something b

情态动词+have done 精析1.表对过去的推测(1) must have done:意思是“一定已经”。If he had really been there,I must have seen him.如果他当时确实在那里，我一定会看见他。对过去的推测must/may /can't have done might have done可用于虚拟语气，表示本可能做某事，却没有做It may not be easy. He may have finished his homewor

两者都属于情态动词，Must have done 是表示对过去事实的肯定；Could have done 事实上并没有做(有遗憾的意思)每日一学：不同情态动词+have done的意思我们经常会看到情态动词加have done的用法，一会儿表示“本该做却没做”，一会儿表示“本不想做但做了”，是不是经常分不清它们的用法呢？

≥﹏≤ Imust have donesomething, he said sorrowfully. “我一定做了什么事，”他伤心地说. 互联网Theymust have doneit! 这件事一定是他们干的. 互联网Hemust have doneit. 他musthavedone表推测【一、musthavedone.】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：Sincetheroadiswet,itmusthaverainedlastnight.当然对现在发生或者将来发生的事