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Just as we sweep our rooms, so we should sweep backward ideas from our minds.
正如打扫房屋一样，我们也要扫除我们头脑中落后的东西。
6 目的状语从句★★
目的状语从句可以由so that(这样), in order that(目的是), lest(以防), for fear that(以防), in case(以防)等词引导，例如：
You must speak louder so that /in order that you can be heard by all. 你一定要说话声音大一点，这样所有人才能听到你的话。
He wrote the name down for fear that(lest) he should forget it. 他把名字记下来，以防忘掉。 7 结果状语从句★★★
结果状语从句常由so… that(如此…以至于…) 或 such…that(如此…以至于…)引导。such 是形容词，修饰名词或名词词组，so 是副词，只能修饰形容词或副词。 so 还可与表示数量的形容词many, few, much, little连用，形成固定搭配。
so nice a flower such a nice flower so many / few flowers such nice flowers so much / little money such rapid progress
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The boy is so young that he can't go to school. He is such a young boy that he can't go to school. 孩子太小，不能上学。 8 地点状语从句★★
地点状语从句通常由where, everywhere等引导，表示在…的地方。
Where there is a will, there is a way. 有志者，事竟成。
Where I live, there are plenty of trees. 我住的地方树很多。
Everywhere you go in America, you meet warm-hearted people.
你在美国到的每一个地方，都会遇到热心的人。
强调结构★★
强调句型的基本形式It is（was）+被强调部分+that（who）…；因此，含有强调结构的句子去掉It is（was） that/who后，仍然可以组合成一个完整的句子；被强调部分可以是主语、宾语、状语等成分。
It was while she was sleeping in her bedroom that a thief broke into the house.
While she was sleeping in her bedroom, a thief broke into the house.
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当她在卧室睡觉的时候，一个贼闯入了房间。 It is from my grandparents that I learned a lot. From my grandparents, I learned a lot. 从我祖父母身上，我学到了很多东西。
In an odd way, however, it is the educated who have claimed to have given up on ambition as an ideal.
In an odd way, however, the educated have claimed to have given up on ambition as an ideal.
奇怪的是，受过教育的人声称已经不在把雄心作为一种理想。
not… until…句型的强调
It is/was not until+ 被强调部分+that+ 其它部分 It was not until dawn that they found their way out of the forest.
直到黎明，他们才找到了走出森林的路。
倒装结构★★
1.否定词放置句首时，助动词或be动词要放置主语的前面进行倒装。常用的否定词有：nor， barely，seldom，not until，（in）under no circumstance，by no means，no sooner…than等。
In no case should we prevent the students from exploring new ideas.
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working and looked up.
2. only+状语/adv/介词短语放于句首时，句子要倒装。
Only recently has something been done to deal with the environmental problems.
直到最近，才做了一些事情来处理环境问题。
Only under such a condition will he make steady progress.
只有在这样的条件下，他才会取得扎实的进步。
Only this morning did I hear the sad news. 我今天早晨才听到这不幸的消息。
3. so 用于句首时, 表示“也…”时，句子要倒装。
If you go to the movie tonight, so will I. 如果你今晚去看电影，我也去。 虚拟语气★
在汉语里表示假设虚拟的情况常用一些虚词来表示，例如“假设”、“如果”等；而英文中表示虚拟的情况不但有虚词的提示，谓语或系动词也要相应的变化。
虚拟语气的基本作用是：1). 表达与事实相反的假设和陈述，分为非真实条件句和非真实主句；2). 表达异想天开很难实现的愿望，类似于非真实条件句；3). 表达建议、命令、劝告等语气，建议
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类虚拟语气。
1. 非真实类虚拟语气★ 基本形式和用法★
非真实虚拟语气中，主句与从句中谓语动词或者连系动词的形式可分为下面三类： 虚拟类型 与现在 事实相反 与过去 事实相反 条件从句谓语动词主句谓语动词或连或连系动词形式 动词的过去式 was had+过去分词 系动词形式 would（第一人称可形 would（第一人称可用should）+have+过去分词 与将来事实were to+动词原形或would（第一人称可可能相反 should+动词原形 用should）+动词原形 be用were而不用用should）+动词原I would ask George to lend us the money if I had known him.
If Bob had come with us, he would have had a good time.
省略if的虚拟形式★ 在虚拟条件从句中，如果谓语包含were，had，should等词，则可以把这些词放到主语前面，省略
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