定语从句讲课4.doc

（）As 与which 是有区别的 A) 相同之处： 都可以用来引导非限制性定语从句，指代前面的主句所表达的内容。which 可做宾语或语 He?married?her,?as?/?which?was?natural.??他跟她结婚了，这是很自然的事。He?is?honest,?as?/?which?we?can?see.??他很诚实，?这一点我们看得出来。 B)? 区别： 1）as引导的非限制性定语从句位置较灵活，可以位于主句前面．中间或后面，一般用逗号与主句隔开，但which所引导的非限制性定语从句只能放在主句之后。例如： As?is?known?to?all,?China?is?a?developing?country.???众所周知，中国是发展中国家。He?is?from?the?south,?as?we?can?know?from?his?accent.??他是南方人，这一点我们从他的口音可以知道。John,?as?you?know,?is?a?famous?writer.??正如你所知，?约翰是个著名作家。。2.）? as有“如” 、“正如”、“像”、“正像”的含义，which 没有。后面的谓语动词多是see, know, expect, say, mention, report等。 as we all know as is explained.as you say . as is said ，as I expect，, as is reported, as is announced, ,等。 ?Bob did an excellent job, as we had expected. Our team won the game, which made us happy. As is known to all,?Taiwan?is part of?China. 3）?当先行词受such,?so ,the?same?修饰时，关系词常用as。?如：I’ve?never?heard?such?stories?as?he?tells.??我从未听过象他讲的这样的故事。This?is?the?same?dictionary?as?I?lost?last?week.??这部词典跟我上星期丢失的一样。。 We are facing the same problems as we did years ago. We are facing the problems which we faced years ago. We hope to get such a tool as he is using. ?We hope to get the tool which he is using. 注意：1.当先行词受the?same?修饰时，偶尔也用?that引导定语从句，但与as引导的定语从句意思有区别。如：?This is the same watch as I lost.这和我丢的那一只手表是一样的。 This is the ame watch that I lost.着就是我丢的那一只手表So…as与so…that区别 This is so good a book_____I like it. This is so good a book_____I like. 6)as引导从句时，从句语义必须和主句一致 She was married again, which was unexpected She was married again, as was expected Zhang?Hua?has?been?to?Paris?more?than?ten?times,?which?I?don’t?believe.??张华已去过巴黎十多次了，这一点我不相信题： 1. The sun heats the earth, _________is very important to us. 2. He failed in the exam,________________ was expected. A. that B. as C. which 题： I want to buy the same pen ____ you are using. This is the same bicycle __________ I have lost. A. that B. as C. which D. A B题： This is such a difficult question ____no