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问题 must have done表达的意义是什么？

在网上看到这么一句话：表达认为某事极有可能的观点，这是出于说话人已知的观点或常理性期待而做出的合乎逻辑的结论：Her mega hairdo must have taken several cans of hairspray to achieve.请问：为什么要用must have done这种形式？

问题 sb could have done后面的反义疑问句

老师sb could have done后面的反义疑问句该怎么问，谢谢！

问题 句法辨析

I am not sure if it has two different meanings?I am not sure does it have two different meanings?请问这两个句子都正确吗？感觉第二个好像有点问题，不知道错在哪里？

问题 助动词过去式加have done用法

may have done sth是对过去发生事情进行推测，但能不能用它对现在或者将来推测呢，还是说对现在或将来就只能用 may do sth 来表达了 谢谢回答

问题 关于being done和having done以及introduce

老师好！下面这几个问题其实我在答疑网问过或搜过，但是仍然弄不清楚。1. 关于being done。http://www.yygrammar.com/Article/200712/41.htmlBeing given a chance, she immediately jumped at it. 给了她这个机会，她立刻抓住。 此处的give应该是动态动词...

问题 想问问老师have been doing 和have always done都表示"一直"的意思，但是学生想知道得详细一些。

...是为了区分动态动词和静态动词而出现的两个表达方式，have been doing 后只能接动态动词，have always done 只能接静态动词？问题2:还是说have been doing 静态动词和动态动词都可以接，只是have always done 一定得接静态动词？      麻...

问题 need have done 结构存疑

Those who failed to get in need not have felt disappointed.以上摘自新概念2课文中。needn't have done 我能理解，是本用不着做实际做了，但课文下面有个注释让我有点困惑。“need后接不定式的完成式表示不必做某事而实际已经做了。"我...

问题 辞书质疑(13)：对《牛津实用英语语法》一句翻译的疑问

...可能是为了与前句翻译的衔接），有没有更好的翻译？Another difference between ought/should and must and have to is that with must and have to we normally have the impression that the obligation is being or will be fulfilled. This is particularly the case with the first person bu...

问题 be being done 与 be getting done 的区别

The two partners disputed over their assets when they were getting disbanded.请问,这里的 进行时被动,用getting和用being有什么区别?  另外,对于"解散" 这个动作,也可以用进行时来表达么?*不知道放在这个分类里对了么,不对的话还请管理...

问题 如何理解by all that's wonderful and audacious？

"Exactly. I have no doubt that you and I could carry it so far. Halloa, Watson, what's this? It's the man himself, by all that's wonderful and audacious! Not a word to show yow suspicions -not a word, or my plans crumble to the ground."从语法结构成分和含义上，...

问题 名词性从句中也用一般现在时表将来吗

...      1. 70页,Swan说从句中一般现在时表示将来的意思： I'll tell you what I find out.（不能说...what I'll find out）        我觉得这种说法很奇怪，甚至觉得不对，因为名词性从句中用will的例子很多，不知道老师对这句有什么看法。  ...

问题 just the way 是连词吗

...heir images, they can remove all the degrading componentsand see the vivid colors of a scene just the way they would have as if that scenewas on land.因为最后，从他们的图像中，他们可以去掉所有的褪色的成分，看到一个场景里生动的色彩，就像他们看到陆地上...

问题 did 和 might have done的分析

For nearly ten years, he did very few interviews or concerts. His simple life might have continued but for the great musician. 这里的did是强调过去的实事，而不是持续的状态？might have done 这里是虚拟的用法，而不是陈述语气对吗？ 

问题 have always been (done/doing) 区别?

1这2个结构,用在现在时态时，always还有什么作用，可以去掉吗？2have always been doing 和 have always been done意思一样吗，是否可以互换？比如这个例句：She's  always been willing to lend him  a hand whenever he's in difficulty.

问题 肯定句中的at all这里表达了什么含义

...tte's opinion of matrimony was not exactly like her own, but she could not have supposed it possible that, when called into action, she would have sacrificed every better feeling to worldly advantage. Charlotte the wife of Mr. Collins, was a most humiliating picture! -- And to the pang of a friend d...