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1、定语从句中关系代词的使用,什么是定语从句？担任定语用法的句子叫做定语从句。因此定语从句又被称为形容词性从句。定语从句的结构是？先行词+关系词+从句e.g. She is the girl who is the most clever in our school. This is an old computer which works slowly.怎么判断一个从句是定语从句呢？可以依据定语从句的结构进行判断，看到先行词和关系词后接从句并且翻译为“的”的句子就是定语从句了。,关系词是做什么用的？引导定语从句的词称为关系词。,关系词的分类,关系代词常见的关系代词有which, that, who,
2、 whom, whose, as。注意：定语从句不能用what引导。既然是关系“代词”，那么是不是说他们是有指代的对象呢？没错，关系代词在定语从句中作主语，宾语，表语，定语等。Examples：This is an old computer. This old computer works slowly.将上两句结合起来后就是：This is an old computer which works slowly.e.g. The place that interested me most was the Childrens Palace. The place interested me mos
3、t. The place was the Childrens Palace.,who和whom 作关系代词的用法。二者都用于指人，who在定语从句中作主语、宾语，whom在定语从句中作宾语。在定语从句中who不能做介词的宾语，whom则可以。e.g. This is the doctor who has just come back from U.S.A. I have many friends to whom I am going to send postcards.注意：一些固定的“动词+介词”固定结构不能把介词提到关系代词前，否则会失去其习语的含义。比如look for, care fo
4、r, deal with, hear from，get through等。e.g. This is the right model for whom Im looking.(X) This is the right model whom Im looking for.练习：将下列句子合成用who或者whom引导的定语从句。He is the only one. He can solve the problem.Key: He is the only one who can solve the problem.There is not a single person. She can turn
5、to somebody for help.Key: There is not a single person to whom she can turn to somebody for help,whose 作关系代词的用法whose 一般指人，但有的时候也能指物。当先行词在从句中以所有格形式进行使用时，一般要用whose。You are the only one. He might listen to your idea.得出结论是:You are the only one whose idea he might listen to.练习：将下列句子合成用whose连接的定语从句：Id lik
6、e a room. The rooms window looks out over the sea.Key: Id like a room whose window looks out over the sea.Please pass me the dictionary. The dictionarys cover is black.Key: Please pass me the dictionary whose cover is black.,which 作关系代词的用法which一般指代物，在定语从句中做主语，宾语，偶尔做定语。e.g. Egypt is a country which i
7、s famous for its pyramids.你能把上面这个句子拆开么？Egypt is a country. The country is famous for its pyramids.练习：将下列句子合成一个which引导的定语从句： The river runs through the centre of the city. The river brings us lots of pleasures.Key: The river which runs through the centre of the city brings us lots of pleasures.That i
8、s my home. My house stands at the top of the mountain.Key: That is my home which stands at the top of the mountain.,that 做关系代词的用法that 常用来指人或物，在从句中可作主语，宾语，和表语。在做宾语和表语的时候可以省略。e.g. The picture (that) we are studying was drawn by a fifteen-year-old student. This is all (that) I can do.瞧一瞧：下面的句子你能拆开么？1.
9、I have been to the city twice (that) you just visited.Key: I have been to the city twice. You just visited the city.2. Is oxygen the only gas that helps fire burn?Key: Is oxygen the only gas? Gas helps fire burn.,as 作关系词的用法as 引导定语从句常出现在suchas, the sameas， asas,或者soas等结构中。as 引导定语从句时，在主句中常作主语，宾语，表语等。e
10、.g. The hunter took only such things as he really needed into the jungle.上面的句子可以拆成：The hunter took only such things into the jungle. H e really needed such things.注意：the sameas 和the same that都表示“和相同”，the same as 强调的是类型的相同 the same that 强调的是物体本身的相同 .e.g. Student A has the same book as Student B has.
11、A学生使用的教材和B同学的是同样的。 Today I use the same book that is used yesterday. 我今天使用的和昨天使用的是同一本教材。,练习：1. The engineer _ my father is talking has just come from abroad.with whom B. with who C. with which D. that2. All _ is needed is a supply of oil.the thing B. that C. what D. as3. I have never seen such a clever boy _ you.A. which B. that C. as D. what4. His parents wouldnt let him marry anyone _ family was poor.A .of whom B. whom C. of whose D. whose5. He lives in a hotel _ is only five minutes walk from here.A. that B. which C. in which D. where,Thanks for watching,
