2020高考英语必考知识点,2017高考英语必考知识点（1）

句型1
　　would rather that somebody did…"宁愿……;更愿意……"(表示现在或将来的愿望)
　　would rather that somebody had done…"宁愿……;更愿意……"(表示过去的愿望)
　　[例句]
　　I'd rather you posted the letter right now. 我想让你现在去寄信。
　　I'd rather you were not a celebrated actor. In that case, we could spend more time together.我到情愿你不是个知名演员，这样我们可以有更多的时间在一起。
　　I'd rather that I hadn't seen her yesterday. 我情愿昨天没有看到她。
　　句型2
　　as if/though+主语+did/had done…好像……(表示现在或将来的情况用过去时;表示过去的情况用过去完成时)[参考句型4]
　　[例句]
　　Alan talked about Rome as if he had been there. Alan谈起罗马来就好像他去过那里似的。
　　句型3
　　"wish +宾语从句"，表示不大 可能实现的愿望
　　表示现在的愿望：主语+过去时;
　　表示过去的愿望：主语+had done;
　　表示将来的愿望：主语+would/could do
　　[例句]
　　How I wish we students had more free time to relax ourselves! 我们学生多么希望有更多的自由时间放松自己!
　　句型4
　　It's high/about time that somebody did (should do) (should通常不省略) …早就该……
　　[例句]
　　It's high time that we did something to improve our environment. 该是我们为环保做些事情了。
　　I think it's high time that she made up her mind. 我想她该拿定主意了。
　　句型5
　　情态动词+动词不定式完成结构的用法
　　could have done "本来可以……"(表示过去没有实现的可能)。
　　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。[参考倒装结构] 请注意下列句式的变化：
　　[例句]
　　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。
　　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。
　　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。
　　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。
　　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]
　　Please remind me about it in case I forget/should forget. 万一我忘了，请提醒我。
　　Please take your umbrella in case (that it rains/should rain).带上雨伞，以防下雨。

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