As引导的定语丛句.ppt

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1、As引导的定语从句1、引导限制性定语从句As引导限制性定语从句，常用于下列句式：Such+n.+as 像一样的，像之类The same+n.+as 和同样的 其中关系代词as在从句中担当主语、宾语、表语We have found such materials as are used in their factory.(as做主语）我们已经找到的像他们工厂里用的那种材料。Such people as you describe are thought to be fools nowadays.(as作宾语）像你描绘的这种人现在被看作是傻瓜。He is not the same man as he

2、was.(as作表语）他和过去不同了。2、引导非限定从句，其先行词为整个句子，as在句中作主语、宾语，as引导非限定从句时放在主句前后均可。As we all know,he studies very hard.As is know to all,he is the best student.注意：which和as都可引限定从，用来指代前面整句话的内容，其区别是：（1）which引导的非限定从句只能放在主句的后边，as引导的非限定从句放在主句前后均可。(2)as意为“正如”，后边谓语v.多是see,know,expect,say,mention,report等，另外as在限定从句中常用于某些固

3、定搭配，如：the same as,suchas等。Which意为”这一点“。限制性与非限制性定语从句1、限制性定语从句是句中不可缺少的组成部分，主句和从句之间不用逗号分开。2、非限制性定语从句是对主句先行词的补充说明，没有从句不影响主句意思的完整，一般用逗号把主句和从句分开，通常不用关系代词that.eg.I have two sisters,who are both students.I have lost the pen,which I like very much.学习非限定从句时应注意的问题1、引导限定从句的关系词都可引导非限定从句，但that除外。That在限制性定从中不仅指人，而

4、且指物，但在非限定性定从中，that不能充当关系词；指人时，用who或whom，指物时用which.引导非限定从的关系词不能省略，不管在定从中充当什么句子成分，引导限定从的关系词，在定从中作宾语时，可以省略，但在非限定从句中是不能省略的。Which引导非限定从句时，不仅可代前面的物或事，而且还代前面整句话的内容。eg.she heard a terrible noise,which brought her heart into her mouth.注意下面的结构1、one of+复数n+关系代词+复数动词2、the(only)one of+复数名词+关代+单数v.the Great wall

5、is the(only)one of the buildings on the earth is seen from the moon.长城是吸引大批游客的世界著名的建筑之一。3、先行词是time时，若time表示“次数”讲时，应用关系代词that引导定语从句，that可省略；若time表示“一段时间”讲时，应用关系副词when或介词at/during+which引导定语从句。I could hardly remember how many times (that)Ive failed.(time意为“次”）There was a time when/during which there we

6、re no radios,no telephones or no TV sets.(time意为“一段时间”）4、the way 做先行词时，作宾语时，关系词用that/which/省略；作方式状语时，关系词用that/in which/省略。The way(that/which)he explained to us was quite simple.(关系词作从句的宾语）the way(that/in which)he explained the sentence to us was not difficult to understand.(关系词作从句的状语）5.不定代词+of which

7、/whom 在这一结构中，常用的不定代词有all,any,both,each,most,none,some等。The old man has two sons,both of whom are doctors.那位老人有两个儿子，他们都是医生。There are a lot of books here,none of which is mine.这儿有许多书，但没有一本是我的。6.数词+of which/whom这一结构中的数词，既可以是基数词和序数词，也可以是分数词和百分数词。I bought some books from the bookstore,five of which were

8、English novels.我从书店买了一些书，其中五本是英语小说。In our factory there are 800 workers,40 percent of whom are women.我们厂有八百名工人，其中百分之四十是妇女。7.形容词比较级或形容词最高级+of which/whom she has six children,the cleverest of whom is John.她有六个孩子，最聪明的是约翰。8.介词+which+名词I often get up at six,at which time it is still very dark in winter.我经常六点钟起床，冬天的这个时候天还很黑。He visited America and Canada,in which countries he had a good time.他游览了美国和加拿大，在这两个国家他过得很开心。9.谓语动词要与先行词保持一致当引导定从的关系代词在从句中作主语时，那么定从句中的谓动的数的形式应与先行词保持一致。I,who am your teacher,will try my best to help you.Have you heard of the persons and things that are being talked about?