定语从句中 as的用法辨析.

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1 定语从句中 as的用法辨析

2 1.We have found such materials as are used in their factory.
such+ n.+ as… the same +n.+ as… as 在定语从句中充当主语、宾语或表语。 1.We have found such materials as are used in their factory. 2.These houses are sold at such a low price as people expected. 3.He is not the same man as he used to be. 主语 宾语 表语

3 such …as/ such… that as Being a volunteer is such a privilege ____ we all want to have. Being a volunteer is such a privilege ____ we all want to have it. 定语从句 that 结果状语从句

4 the same…as /that… This is the same book as I lost. 这本书和我丢的那本一模一样。
This is the same book that I lost. 这本书就是我丢的那本。

5 二、关系代词as、which引导非限制性定语从句的区别
The moon travels round the earth once every month, _______ we all know. _______ is known to everyone, the moon travels round the earth once every month. as /which As 当非限制性定语从句在主句前面时只能用as。

6 as/which 1.从句是否定或否定意义时，只能用which
He came here very late, which was unexpected (not expected.) 2.as做主语，后常接被动语态。主动一般用which。 She has been late again, as is expected. Tom has made rapid progress, which makes me very happy. 3.从句中含有复合结构，只能用which。 Betty always tells a lie, which her parents find strange.

7 as的使用 习惯用语: as is known to all as we have expected
as is often the case as has been said before as is mentioned above …

8 Thank You!

9 Consolidation exercise:
1. He is such a lovely boy ______ everyone likes. 2. He is such a lovely boy ______ everyone likes him. 3.______ is known to us all, China has the largest population in the world. 4. That student was caught cheating in the exam yesterday, ______ made the teacher very disappointed. 5.I want to use the same dictionary ______was used yesterday. A. which B. who C. what D. as 6.I have bought such a watch _______ was advertised on TV. A. that B. which C. as D. it 7.He is good at English, ______we all know. A. that B. as C. whom D. what 8.John got beaten in the game, _______ had been expected. A. as B. that C. what D. who as that As which

10 Self-assessment: Gains:______________________________________________________________________________________ Difficulties:__________________________________________________________________________________