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1、as引导定语从句时的特殊用法关系代词as既可以引导限制性定语从句，也可以引导非限制性定语从句。as可以在从句中作主语、宾语或表语。1. as引导限制性定语从句as引导限制性定语从句， 置于先行词之后，与其词义关系密切，不可分割。如：He is such a good boy as everyone likes.他是大家都喜欢的好孩子。Such machines as are used in our workshop are made in China.我们车间使用的机器是中国制造的。as 常见搭配：1）such+（不定冠词+）名词+as引导的定语从句，意思是“像一样的”。如：The littl
2、e boy realized that there was no such a tank as he dreamed of after he got to the museum.那个小男孩儿到了博物馆后才知道没有他所想象的那种坦克。2）the same+名词+as引导的定语从句，意思是“同一类事/物”。如：Lao Li bought the same computer as I did.老李买的电脑跟我买的一模一样。1.as引导非限制性定语从句as引导的非限制性定语从句，既可以放在主语之前，也可以放在主语之后。通常用于下列句型：as is know to all，as is said，as i
3、s reported，as is announced，as we know，as I expected如：As I expected, he got the first place again in this mid-term examination.正如我所预料的那样，他在这次期中考试中又得了第一名。2.as引导非限制性定语从句时与which的区别1）当非限制性定语从句置于主语之前时，只能用as。如：As is known to us, the moon travels round the earth.2）从句置于主语之后，且从句有否定词或表示否定意义时，只能用which。如：Tom was
4、 late for school this morning, which was unexpected.汤姆今天迟到了，这让人觉得意外。He drinks a lot every day, which his wife doesnt like at all.每天他都喝很多酒，他的妻子一点都不喜欢他这样。3) 非限定性定语从句中出现expect , think , suppose 等表示猜测、想象、预料等时，只能用asShe succeeded in her doing the research work , as we expected . 4)固定搭配：such/the same+asExe
5、rcises:1. The British are not familiar with different cultures and other ways of doing things, _is often the case in other countries. A) as B) what C) so D) that2. _might be expected, the response to the question was very mixed. A) As B) That C) It D) What3. I hope all the precautions against air pollution, _suggested by the local government, will be seriously considered here. A) after B) while C) as D) since3普通教学