might have done 本来可能……;本来应该或可以做某事(实际没有发生;含有轻微的责备语气。
should/ought to have done 本来该做某事(而实际未做)
should not/ought not to have done 本来不该做(实际却做过了，含有责备语气)needn't have done 本来不必做(但是已经做过了)
would rather have done 当时宁愿做了某事(实际没有做过);否定式would rather not have done表达相反意思，两者都有表示后悔之意。
句型6
as, though, although引导的让步状语从句。
[注意]
although位于句首;
though位于句首或句中;
as位于句中=though。
它的词序是把句中强调的形容词、副词、动词或名词放在连词前。
[考倒装结构] 请注意下列句式的变化：
[例句]
1. Although/Though I'm young, I already know what career I want to follow.→Young as/though I am, I already know what career I want to follow.
我虽然年轻，但我已经明白我应该追随什么样的事业。
2. Although/Though I respect him very much, I cannot agree with his idea.→Much as/though I respect him, I cannot agree with his idea. 虽然我很尊重他，但是我不同意他的观点。
3. Although/Though he is a child, he knows a lot of Chinese characters.
→Child(省略冠词)as/though he is, he knows a lot of Chinese characters. 他虽然还是个孩子，却认识了许多汉字。
4. Although he tried, he couldn't solve the problem.
→Try as he might, he couldn't solve the problem. 尽管他努力了，但是他没有解决问题。
5. Although it is raining, I'm going out for a walk.
→Raining as it is, I'm going out for a walk. 天虽然在下雨，我还是要出去散步。
6. Strange as it may seem, nobody was injured in the accident. 这次意外虽然显得不可思议，却没有人受伤。
7. Much as I would like to help, I have a lot to do. 虽然我很想帮助你，但是我有很多事要做。
8. Object as you may, I will go. 纵使你反对，我也要去。
句型7
…before…特殊用法(1)没来得及……就……
[例句]
The roof fell before he had time to dash into the room to save his baby.
他还没有来得及冲进房间救孩子，房顶就塌了。
He ran off before I could stop him. 我还没有来得及阻止，他已经跑了。
To my great disappointment, my favorite singer left the concert before I could have a word with her.
让我非常失望的是，我还没有来得及和我最喜欢的歌手打招呼，她就已经离开了。
句型8
…before…特殊用法(2)过了多久才……或动作进行到什么程度才……
[例句]
They walked about fifty miles to the west before they saw a village.
他们西行50英里才看到一个村庄。
The workers worked day and night about three days before everything returned to normal.
工人们连续工作3天才使一切恢复正常。
He almost knocked me down before he knew it.
他几乎撞到我了才意识到。
We had walked a long way before we found some water.
我们走了很长的路才找到一点水。
Five years went by before I knew it. 不知不觉，五年过去了。
句型9
It was + 时间段+before….过了多久才(怎么样)……
It was not long before….不久，就……
It will (not) be +时间段+before… .要过多久(不久)……才……(before从句谓语动词要用一般时态)
[例句]
It was not long before he sensed the danger of the position.不久他就意识到他处境的危险。
It was five days before he came back. 五天后他才回来。
It will be half a year before you graduate from the school. 再过半年你才能毕业。It will not be long before they understand each other. 他们大概不久就会互相了解。句型10
in case of…(+n.) 以防;万一;
in case that…以防，万一……(谓语动词用一般现在时态或should+动词原形)
[例句]In case of fire, what should we do?
Please remind me about it in case I forget/should forget. 万一我忘了，请提醒我。In case (that) John comes/should come, please tell him to wait.
Please take your umbrella in case (that it rains/should rain).带上雨伞，以防下雨。
高三英语必背知识点
虚拟语气
虚拟语气也是一个难点。所谓虚拟语气是表示说话人的愿望、假设、猜测或建议，而不表示客观存在的事实。它通过句子的谓语动词的特殊形式来表示。
现归纳如下：纯假设，用虚拟，动词时态退一级：条件句，分主从，主句谓语前加would
(should,could，might);表愿望,用虚拟，wish后面接宾语(从句)：现在过去与将来，动词时态退一级：提建议，用虚拟，宾语(从句)动词用(should)do：俩建议，三要求，再加坚持与命令
(suggest,advise,demand,require,request,insist,order)：It is time和eoukd
rather,后接丛句用虚拟：部分主语从句中， 谓语用虚拟结构 (It is necessry
/important/natural/natural/strange/strange that??should do)。 下面举例说明：
A、If you came tomorrow,we would have the metting. (条件句虚拟)
B、Without air,there would be no living things.(同上)
C、We wish we had arrived there two hours earlier.(表示愿望虚拟)
D、He demanded that we (should)start right away.(表示建议虚拟)
E、It is(high)time that we left (should leave)now.(特殊从句虚拟)
F、I would rather you gave me the book.(同上)
G、It is necessary that we should clean the room everyday，(主语从句虚拟) H、He
speaks English so fluently as if he were English. (特殊从句虚拟)
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