as引导定语从句时的特殊用法.doc
-作者xxxx-日期xxxxas引导定语从句时的特殊用法【精品文档】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 little 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 is 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 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+asExercises: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) since【精品文档】