As用法总结PPT学习教案.pptx

会计学
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As用法总结
Ⅱ. As作连词，主要引导以下状语从句：
1. 引导时间状语从句。与while意义相近，强调两个动作同时发生；或某事一发生，另一事立刻发生。 ① He shouted aloud as he ran along. ② I was startled as he opened the door. ③ We get wiser as we get older.
2. 引导原因状语从句，与because的用法相近。

① As it was getting very late, we soon turned back. ② We must stop writing now, as I have rather a lot of work to do.
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3. 引导方式状语从句，作“正如，好象，按照”解。主要的句式有as if(as though);just as;just as…as .
① When at Rome, do as Romans do. ② We do farm work as the old peasant teaches us. ③ When a pencil is partly in a glass of water, it looks as if it were broken. ★ ④ As(it is)in your country, we grow wheat in the north and rice in the south. 正如(像) 你们国家一样，…… 。
4. 引导条件状语从句。主要句式有：
as long as /so long as 只要
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As long as you study hard, you will make great progress.
5. 引导让步状语从句；作“虽然，尽管”解。这时从句常用倒状语序，即把从句中的表语,状语或动词原形放在as之前。
① Child as she is, she knows a lot. ★ → Though she is a child, she knows a lot. ② Busy as he is, he insists on studying. → Though he is busy, he … . ③ Try as he might, Tom could not get out of the difficulties. → Though he might try, Tom could not get out of the difficulties.
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Ⅲ. As作关系代词
1.
引导限制性定语从句，用在“such… as”, “the same …as/the same as”等结构中，常译作“像……一样的人或物”，“凡是……的人或物”。
He wished to be such a man as Lei Feng was.
My bike is the same as yours.
①
②
2. 引导非限制性定语从句，用来指代它前面的整个句子(即先行句)，意思是“这一点”。这个分句可以放在句首，句中，或句末。
③
This elephant is like a snake, as anybody can see.
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④
As is well known, oceans cover more than 70% of the earth.
3.
若非限制性定语从句位于句首，句中或句末， 则用as来引导。
As we expected, he completed his task with great success.
①
②
The compass was invented in China, as we know now.
4.
若非限制性定语从句中的谓语动词是