must have been donedone什么意思

来源：蜘蛛抓取(WebSpider) 时间：2016-03-11 04:03 标签： must have done例题
情态动词+have done 如 could have done,must have done,should have done 等等在如他么的否定词表示什么意思?
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情态动词+have done 是一种虚拟语气,和情态动词+动词原形的区别是：用原型表示事情发生在现在或将来,而用have done ,表示事情发生在过去.例如,You must be tired now.（你现在一定很累）You must have seen the film.（你一定看过这部电影）指的是你过去一定看过.考试常考这么几种：must have done （过去）一定做过某事It must have rained last night.（昨晚一定下雨了）cann't have done （过去）一定没有做过某事He cann't have seen the film,because he doesn's know anying about it.（他一定没看过那部电影,因为他对它一无所知）注意：千万不能用mustn't ,因为它是“禁止,绝不可以”的意思could have done （过去）本来可以做成某事实际上却没有I could have succeeded in the game if I hadn't have a cold.（如果我没感冒的话,我可能已经在比赛中成功了）should have done （过去）应该做某事而没有做You should have cleaned your room yesterday.（你昨天就应该把屋子打扫了）而实际上却没有
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表示本应该做某事而实际上没做否定表示本应该不做某事，而实际上做了某事都表示含有一种遗憾的语气
could have done本能够做却没有做must have done一定做了...should have done本应该做却没有做
虚拟语气，假设某种情况表示本应该做某事而实际上没做 否定表示本应该不做某事，而实际上做了某事 都表示含有一种遗憾的语气
虚拟语气，假设某种情况
表示本应该（可能）做某事实际上没做
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display: 'inlay-fix'must have done和must be的区别？_百度知道
must have done和must be的区别？
要求详细，权威
提问者采纳
你一定撒谎了：You must be a student。PSmust have done一定做过（表示过去做过的事对现在的影响）例：绝对权威。must be一定是
表示一般的陈述例.你一定是个学生：You must have lied
提问者评价
恩...有点看不懂 ..但说得很好..分嘛 ..给你了
must be done 意思是必须要做什么事 must have done 这是虚拟语气
必定做了…（表示对过去的推测
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其他1条回答
一般选项里有两者must have done一定做过（表示过去做过的事对现在的影响）表示对过去的猜测，一般用于虚拟语气。PS。must be一定是
表示一般的陈述两者都是肯定的语气：如果用于考试，基本上都选must have done这类形式的
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出门在外也不愁could have done sth 和must have done sth 的区别是什么
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如：He could have been very rich,but he cared for no money at all.must have done 对过去的动作的推测.如; You must have seen him yesterday.你昨天一定看到他了.微笑——阳光的感言：would have done本来要做完成的事却因其被他事而耽搁,注意重点放在时间.He would have done the painting by this time tomorrow.He would have done the painting if he had come earlier.could have done本来能够做的事却没做,没有做完,有可惜,能力不足的感触心态He could have done the painting if he did not fall down.He could have done the painting if he could come earlier to do the work.should have done本来应该做的事却没做,有指责的心态He should have done the painting for me without additional charges.He should have done it for me yesterday.needs to be done有必要做的事却没做,有理智,指示,策划的心态.This painting job needs to be done before it rains.must have done一定有做过某事,发言者含有怀疑心态.He must have done this to make her happy.This painting must have been done when I was away from the house补充：would have done,虚拟语气,表示对过去事情的假设,意思是“本来会做”.could have done,本来能做某事,但实际没做.用在疑问句中表对过去发生的动作的推测can't+have+done表示对过去事情的否定推测,译成“不可能做过某事”.should have done,本应该做某事,实际没做need+have+done表示本来需要做某事而没有做needn't have done,本没有必要做某事但做了must have done 表示对过去事情的肯定推测,肯定发生了某事,该结构只用于肯定句微笑——阳光的感言：
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