《单元语法聚焦》Great People PPT
第一部分内容：教材典句
1. After he finished school, he went on to study physics in Switzerland.
毕业后他去瑞士继续研究物理学。
2. He signed his last letter before he passed away.
在去世之前，他签署了他的最后一封信。
3. As Helen grew older, she made a lot of progress and learned to read.
随着年龄的增长，海伦取得了很大进步并学会了阅读。
4. Anyone who has never made a mistake has never tried anything new.
一个从不犯错误的人，一定从来没有尝试过任何新鲜事物。
5. In the dream, he grew a new type of rice that was as big as a peanut.
在梦里，他种植了一种像花生一样大的新型水稻。
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单元语法聚焦PPT，第二部分内容：语法探究
一、before, after 和as 引导的时间状语从句
1．before, after和as都可以引导时间状语从句。before意为“_______________”；after意为“_______________”； as 除了表示“随着……”，还可以表示“正当……时”和“一边……一边……”。
The students were talking as the teacher came in.
当老师进来时学生们正在说话。
We always sing as we walk. 我们总是边走边唱。
2. 当时间是将来的时候， before, after和as引导的时间状语从句常用________时态，而主句要用________时态。
I will call her after I finish the work.
完成工作后，我将会给她打电话。
二、that 和who引导的定语从句
1. 定语从句是用来修饰________词或________词的句子，起定语的作用。其中，被修饰的词叫作先行词。定语从句通常出现在先行词________(之前/之后)，由关系代词或关系副词引导，关系代词或 关系副词代替________，并在从句中作一定的成分。
2. who在定语从句中指代________；that在定语从句中既可指代________， 又可指代________； who和that在定语从句中既可作________语，又可作________语，作 ________语时可省略。
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单元语法聚焦PPT，第三部分内容：实战演练
I. 单项选择
( ) 1. ________ Helen's knowledge and vocabulary increased, she asked more and more questions.
A．Unless B．While
C．As D．Before
( )2. Someone called me up in the middle of the night, but he hung up________ I could answer the phone.
A．after B．since
C．until D．before
( )3. 2017•攀枝花 The book was so interesting that he had read it for three hours________ he realized it.
A．before B．after
C．until D．since
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