定语从句讲解和经典例题
中考定语从句讲解与练习精选全文完整版
可编辑修改精选全文完整版中考定语从句讲解与练习一、定语从句的概述在复合句中修饰或限定名词、代词的从句叫做定语从句。
被定语从句修饰或限定的名词、代词叫做先行词；引导定语从句的词叫做引导词。
定语从句放在所修饰、限定的词（先行词）之后。
例1：The boy who is reading a story book is my brother. 那个正在读一本故事书的男孩是我的兄弟。
在这句话中，who is reading a story book.是定语从句。
它修饰、限定the boy，the boy是先行词，引导定语从句的who是引导词。
二、定语从句的分类：定语从句可分为限制性定语从句和非限制性定语从句。
1. 限制性定语从句一般紧跟在先行词的后面，用来说明先行词的性质、身份、特征等状况，与先行词的关系非常密切，翻译时一般要译到先行词的前面；如果去掉，则整个句子的意思含混不清。
A doctor is a person who looks after people's health. 医生是照顾人们健康的人。
2. 非限制性定语从句起到补充说明作用，译为汉语时常不译作定语，而是根据句意译为相应的其他形式的从句。
它与主句的关系不如限制性定语从句密切，只是对先行词作附加说明，既使去掉，主句的意思依然清楚。
非限制性定语从句前往往有逗号与主句隔开，如非限制性定语从句放在句子中间，其前后都需要用逗号与隔开。
Yesterday, Jimmy left for Canada, where he had stayed two years.昨天，吉米动身到加拿大去了，他曾在那儿呆了两年。
三、定语从句的引导词引导定语从句的词称为引导词，它一方面连接先行词和定语从句；别一方面又在定语从句中充当句子成份，引导词一般不能按照疑问代词或疑问副词的意义进行翻译，一般情况下应译为“……的”。
定语从句的引导词可为分为关系代词和关系副词。
初中英语定语从句解题技巧讲解及练习题(含答案)及解析
初中英语定语从句解题技巧解说及练习题( 含答案 ) 及分析一、定语从句1．-- Class, you should be thankful to those people _______ helped and supported you.--We will. Miss Chen.A． whichB． whomC． whoD． whose【答案】 C【分析】句意：——同学们，你们应当感谢那些帮助你们和支持你们的人。
——陈小姐，我们会的。
which 指引定语从句，修饰事物，作主语、宾语和表语；whom 指引定语从句，修饰人，作宾语或表语；who 指引定语从句，修饰人，作主语或宾语。
whose 指引定语从句，修饰人或物，作定语；此处修饰先行词people ，表示人，作定语从句的主语，故用who 。
应选 C。
2．When we speak of culture, we mean a way of life_________ a group of people have in common.A． what B． who C． where D． that【答案】D【分析】【详解】句意：当我们提及文化的时候，我们指的是一群人共同拥有的生活方式。
观察定语从句的指引词。
依据句意：当我们提及文化的时候，我们指的是一群人共同拥有的生活方式。
逗号后边的句中是含有定语从句的复合句，先行词是life ，表示“物”，用指引词that ，在从句中做宾语。
what不可以指引定语从句。
先行词“人”，指引词常用who 。
where在定语从句是中做地址状语。
应选D。
【点睛】指引定语从句的关系词包含关系代词和关系副词。
关系代词有that, which, whose, who, whom, as ；关系副词有 when, where, why 。
关系代词和关系副词在定语从句中都充任必定的句法成份。
关系代词在从句中充任动词的宾语时一般能够省略。
定语从句讲解及练习带答案
初中定语从句讲解及练习第一部分:基础知识（一）．定语从句概述定语可以由形容词，代词，数词，名词，不定式，介词短语来充当。
如果是一个句子担任定语，那么这个句子就叫做定语从句，又可称为形容词性从句。
定语从句通常修饰某一名词或代词，被定语从句修饰的这一名词或代词叫先行词，它位于定语从句之前，定语从句在先行词后面，应尽量紧跟先行词。
定语从句的作用即在于对先行词进行限定说明或补充说明。
（二）．定语从句的引导词。
定语从句的引导词分为两类，关系代词（that, which, who, whom, whose ）和关系副词（when, where, why ），引导词在先行词和定语从句之间，既起连接作用，即连接先行词和定语从句，更重要的是，它又在定语从句中作一个成分。
（三）．关系代词1. that 指人，物，在从句中作主语，宾语，表语。
This is the photo that I took in the country.He is the singer that I met yesterday.2. which 指物，在从句中作主语，宾语，在非限定定语从句中充当定语，或者代替前句The film which we saw last night was moving.3. who 指人，在从句中作主语，宾语。
The person who visited our classroom yesterday was our new headmaster.The man who you just talked to is Tom.4. whom 指人，在从句中作宾语。
That is the professor whom you want to know.5. whose 指人，物，在从句中作定语，相当于先行词+ ’s, 后接一名词。
I know the boy whose parents are dead.I don’t like those cities whose roads are dirty.注：关系代词在从句中作宾语时可以省略。
完整版)高中英语定语从句讲解及练习
完整版)高中英语定语从句讲解及练习定语从句是高中英语的重点知识，也是高考常考点。
本文将主要讲解关系代词引导的定语从句，并解释关系副词引导的定语从句，包括判断关系代词与关系副词限制性和非限制性定语从句等内容，并提供例题讲解。
定语从句在句中作定语，修饰一个名词或代词，被修饰的名词词组或代词即先行词。
通常出现在先行词之后，由关系词（关系代词或关系副词）引出。
关系代词有：who。
whom。
whose。
that。
which等。
它们代替的先行词是人或物的名词或代词，并在句中充当主语、宾语、定语等成分。
当关系代词在定语从句中作主语时，从句谓语动词的人称和数要和先行词保持一致。
例如，当先行词是人时，可以使用who或whom作为关系代词。
如：Is he the man who/that wants to see you?（他就是你想见的人吗？）关系代词在从句中作主语。
而当先行词是物时，可以使用which或that作为关系代词。
如：The package（which / that）you are carrying is about to come unwrapped.（你拿的包快散了。
）关系代词在从句中作宾语。
除了who。
whom。
whose。
that。
which，还有关系副词when。
where。
why等。
关系副词引导的定语从句也可以修饰一个名词或代词。
例如：I still remember the day when we met.（我仍然记得我们相遇的那一天。
）关系副词when在从句中作时间状语，修饰先行词day。
总之，掌握定语从句的用法和关系词的选择是英语研究的重要内容。
通过不断的练和实践，相信大家可以掌握这一技能。
关系副词可以代替时间、地点或理由的名词，在从句中作状语。
例如，关系副词when。
where。
why的含义相当于“介词+ which”结构，因此常常和“介词+ which”结构交替使用。
比如，有时候我们必须屈服，这是任何人都会遇到的情况（There are ns when [on which] one must yield）。
高考英语定语从句讲解+习题-
在复合句中充当定语的从句叫定语从句。
定语从句的作用相当于形容词，用来修饰主句中的某一名词或代词或整个主句，所以，也称作形容词性从句。
被定语从句修饰的词叫先行词，定语从句一般紧跟在它所修饰的先行词之后。
在先行词和定语从句之间起连接作用的词叫关系词。
关系词有关系代词和关系副词两种。
提示：关系词在定语从句中有三大作用1. 连接作用——连接先行词和定语从句。
I I . 我把我所有的钱都给了她。
（连接先特词和定语从句I ）2. 替代作用——在定语从句中替代从句所修饰的先行词。
a . 住在隔壁的那个人是个名师。
（替代）3. 成分作用——在定语从句中作主语、宾语、定语或状语。
I . 我喜欢传统的中国画。
（在定语从句中作主语）一、关系代词引导的定语从句引导定语从句的关系代词主要有, , , , 等。
它们分别代替前面的先行词，并在定语从句中作主语、宾语或定语。
A．指人，在定语从句中作主语。
借钱给你的那人叫什么名字？（定语从句修饰先行词）. 谁笑到最后谁笑得最好。
（定语从句修饰先行词）会议主席坐在我右边，他先发言。
（定语从句修饰先行词）B．指人，在定语从句中做宾语。
在口语或非正式文体中，可省略或可用来代替，但在介词后面以与在非限制性定语从句中只能用。
有些人我们是喜欢的，有些人则是我们讨厌的。
（定语从句分别修饰先行词, ）I .和我一起工作的人都很友好。
（定语从句修饰先行词）. , I , .. , I , .昨晚我在里和卡特先生交谈过，他对我们的计划很感兴趣。
（非限制性定语从句中不能用代替）, I , .两个人来到我的办公室，我以前从未见过他们。
（在介词后面不用）C．人、物皆可，做定语，后面要紧跟被修饰的名词，先行词和后面的名词之间往往是从属关系。
有些人，他们的脸你永远难以忘怀。
（定语从句修饰先行词）I .我看见一些树的树叶由于空气污染而发黑。
（定语从句修饰行词）D．1．指物，在定语从句中做主语或宾语。
做宾语时常可省略。
高中英语定语从句讲解及练习较全面
高中英语定语从句讲解与练习定语从句在句中做定语，修饰一个名词或代词，被修饰的名词词组或代词即先行词。
定语从句通常出现在先行词之后，由关系词〔关系代词或关系副词〕引出。
关系代词有：who, whom, whose, that, which等。
关系副词有：when, where, why等。
18.1 关系代词引导的定语从句关系代词所代替的先行词是人或物的名词或代词，并在句中充当主语、宾语、定语等成分。
关系代词在定语从句中作主语时，从句谓语动词的人称和数要和先行词保持一致。
1〕who, whom, that 这些词代替的先行词是人的名词或代词，在从句中作主语和宾语。
例如：Is he the man who/that wants to see you? 他就是你想见的人吗？He is the man whom/ that I saw yesterday. 他就是我昨天见的那个人。
2〕whose 用来指人或物，〔只用作定语, 假如指物，它还可以同of which互换〕。
例如：They rushed over to help the man whose car had broken down.Please pass me the book whose 〔of which〕cover is green. 3〕which, that所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等。
例如：A prosperity which / that had never been seen before appears in the countryside. The package 〔which / that〕you are carrying is about to e unwrapped.18.2 关系副词引导的定语从句关系副词可代替的先行词是时间、地点或理由的名词，在从句中作状语。
1〕关系副词when, where, why的含义相当于\"介词+ which\"结构，因此常常和\"介词+ which\"结构交替使用。
(word完整版)高中英语语法定语从句讲解及练习
高中英语语法：定语从句定语从句在句中做定语，修饰一个名词或代词，被修饰的名词词组或代词即先行词。
定语从句通常出现在先行词之后，由关系词（关系代词或关系副词）引出。
关系代词有：who, whom, whose, that, which等。
关系副词有：when, where, why等。
注意：关系代词和关系副词处在先行词和定语从句之间，起着连接主从句、指代先行词和在从句中作句子成分的三重作用。
一、关系代词that, which, who引导的定语从句二、关系代词whose引导的定语从句关系代词whose为关系代词who的所有格形式，用作名词的限定语，whose引导的定语从句既可为限制性的，也可为非限制性的。
先行词既可为人，也可为物，whose和它所修饰的名词在定语从句中可作主语及动词或介词的宾语。
例如：This is the scientist whose name is known all over the world.The room whose window faces south is mine.He has written a book whose name I’ve forgotten.=He has written a book the name of which I’ve forgotten.四、判断关系代词与关系副词先把主句和定语从句分开，再找出定语从句所修饰的名词/代词（即先行词），然后放入定语从句中，看看这两者的搭配情况。
1）如果定语从句和该先行词可以直接相连，且在从句中充当主语/宾语/表语的话，则用关系代词。
This is the city (which/that) you visited last year.2）如果定语从句和该先行词无法直接相连，必须另外多加上介词，并在定语从句中充当状语时，则使用关系副词。
This is the city where you stayed last year.选择：1. Is this museum ___ you visited a few days age?A. whereB. thatC. on whichD. the one2. Is this the museum ____ the exhibition was held.A. whereB. thatC. on whichD. the one五、限制性和非限制性定语从句1）定语从句有限制性和非限制性两种。
复习专题定语从句考点+例题-全面解析
复习专题定语从句考点+例题-全面解析一、定语从句1．Ant Forest is a popular mobile app_____ allows people to plant real trees in the desert by collecting “green energy points’’.A．what B．who C．whom D．which【答案】D【解析】【详解】蚂蚁森林是一款允许人们通过收集绿色能量在沙漠里种植真的树木的流行的手机应用软件。
考查定语从句。
本句为定语从句，先行词是a popular mobile app指物，关系词用which，故选D。
2．The movie ______ we saw last night was fantastic.A．that B．what C．whose D．Who【答案】A【解析】【详解】句意：我们昨晚看的那场电影好极了。
考查定语从句引导词。
本句定句从句的先行词The movie是物，并且关系代词在定语从句中作宾语，可知使用关系代词that或which；故选A。
3． The dog _______ played with you just now is _______.A．which; mine B．which; myC．what; mine D．what; my【答案】A【解析】【详解】句意：刚才和你一起玩的那条狗是我的。
Which哪一个；what什么；mine名词性物主代词，我的；my形容词性物主代词，我的。
形容词性物主代词在句只用作定语；名词性物主代词则不能用作定语，但可以用作主语、宾语、表语、连用of作定语。
先行词dog在定语从句中作主语可用关系代词which代替。
所以选A。
4．My mother doesn't like stories _____have sad endings.A．that B．who C．where D．those【答案】A【解析】【详解】句意：我妈妈不喜欢有悲伤的结局的故事。
定语从句讲解+例句例题
一、只用that不用which主句已有疑问词who或which先行词既有人又有物时（先行=人+物）先行词为不定代词：thing系列(something, everything, anything, nothing), all, much, few, little, none先行词+形容词最高级/序数词先行词由以下修饰：The系列（the very, the only, the same）,any, few, little, no, all, one of, some（与3中all的区别）有两定从时，一用which，则另一用that先行前有such、the same修饰，先行词和关系代词指同一物时（有例题，such的意思不是“像…一样的”，与as 用法做区别）There be结构，修饰主语的定从宜用that1、Which of the cars that are in front of the hotel belongs to you?2、He talked about the schools and teachers that he had visited.3、We haven’t got much that we can offer you.All that you need is…4、This is the most interesting film that I’ve seen.5、This the very room that I slept in that evening.6、Edison built up a factory which produced things that had never been seen before.7、She is wearing the same dress that she wore yesterday.Tom is such a strange boy __as__ no one can understand.8、There is another reasonable alternative(选择) that you can choose.只用which不用that非限定从关系代词前有介词先行词后有插入语有两定从时，一用that，则另一用which（无例句）先行词本身是that1、The fish, which I bought this morning, was very fresh.2、This is the hotel in which you will stay.3、Here is the English book which ,as I’ve told you, will help improve your English5、What’s that which flashed in the sky just now?二、分隔定从在先行词和定语从句之间插入另一个定语短语(先行词+次定语+主定语)在先行词和定语从句之间插入另一个状语短语做主语的先行词后带一个定语从句,而句子的谓语又比较短(比如是被动语态,不及物动词),此时,常将定语从句移到句子后面,以避免头重脚轻,保持句子平衡在先行词和定语从句之间插入一个插入语（无例句）The village has developed a lot ____ we learned farming two years ago.A. whenB. whichC. thatD. where D1、Do you remember one afternoon ten years ago when I came to your house and borrowed a diamond necklace?2、There are many thousands of stars in the sky that are like the sun.3、All is not gold that glitters(发光).The day will come when the Chinese set foot on the moon.三、介词;关系代词；关系副词；whose1.介词+关系代词（要点：介词的确定）(1)根据介词和定语从句中谓语动词的习惯搭配(2)根据定语从句意思的需要, 此时不但要注意其前的搭配也要注意其后的搭配注意1) 介词后面的关系词不能省略2) that前不能有介词3) （要点2）某些在从句中充当时间，地点或原因状语的“介词+关系词“结构可以同关系副词when，where和why 互换2.介词+which与关系副词在定语从句中, 当先行词是表示时间、地点或原因的名词时, 就要分别用关系副词when, where, why来引导, 在从句中作状语。
超全的定语从句的讲解和练习
定语从句知识结构图解概念：定语可以由形容词,名词,代词,分词,不定式以及介词短语等来担任，也可以由一个句子来充当，充当定语功能的句主,宾，表，定先行词与定语从句之间有逗号隔开)(可以省略that)which且不能省略）修饰等There are many young menwho are against him.Tom, who is my best friend, has gone abroad to study.Let me show you the novel that I borrowed from the librarywhich is newly open to us.①先行词是不定代词如②先行词被This is the very book that I want.She described in her compositions the people and用that④先行词前有序数词或形容词最高级修饰时。
This is the best book that I have ever read.This is the first film⑤定语从句中套定语从句，其中一个关系词以用He built a factory which produced thingsthat had never been seen before.定Who is the person that is standing at the gate?语定语从句从★Such/so句Taiwan is an inseparable part of China, as is known to all.①WhenI still remember the day when I first came to Beijing.②Where① way在定语从句中做状语时的三种引导方式that / in which / 不填The way in which / that / 不填he explains the sentence to us is quite simple.比较: The way which /that/不填he told to us was quite simple.（★way在定语中作tell的宾语）③先行词reason①⒎介词+④Here is the money定注意:语定语从句10从句①当先行词是⒐定语从句的注意：Ⅰ.关系代词whose的用法。
定语从句详解及经典习题
定语从句1. 定语从句的结构及理解2. 定语从句的关系词的使用3. 定语从句的简化表达知识总结归纳（一）定语从句的结构：在复合句中，修饰某个名词或代词的句子（做这个名词或代词的定语）叫定语从句，定语从句一般放在被修饰的名词或代词后面，被修饰的名词或代词叫做定语从句的先行词，它与定语从句之间要有一个词连接，这个词指代先行词的内容叫做关系词（关系代词或关系副词：that, which, who, whose, when, where, why）。
先行词在定语从句中充当主语，宾语，时间，地点，原因状语。
结构：先行词+关系词+定语从句。
1. There she saw a wall of water that was quickly advancing towards her.2. In Japan, someone who sees another person making the gesture will think it means money.3. A theme park is a collection of rides, exhibitions or other attractions that are based on a common theme.4. The park has a conservation center that helps protect marine animals and their habitats in the rivers and coastal waters of Asia.5. Visitors can go on exciting rides where they can feel what it is like to do the things they have seen their heroes do in the movie.6. Oprah Winfrey is a black woman whose rise to fame is an inspiring story.（二）定语从句分为限定性定语从句和非限定性定语从句：限定性定语从句：从句对先行词进行必要的描述或说明，缺少它，则句义显得不完整，从句与先行词紧密相连。
定语从句最细致讲解，附练习题（值得收藏）
定语从句最细致讲解，附练习题（值得收藏）定语从句（安徽中考不考，但平时月考会考到）（一）1.定语从句的概念：在复合句中，修饰某一名词或代词的从句叫定语从句。
2.先行词：被定语从句修饰的名词或代词叫先行词。
3.关系词：引导定语从句的连词叫关系词。
如that、which、who、whom、whose、where、when等。
4.由that、which、who、whom、whose引导的定语从句。
that指人也指物which指物who指人whom指人，做宾语whose指人或物，做定语二、定语从句（二）1.先行词是物时，一般情况既可用that也可用which.但下列情况下，只能用that不用which。
1).当先行词为指物的不定代词，如all、everything、something、anything、nothing、none、the one等时，只能用that。
There is nothing ______ I can do for you .2).当先行词被the only、the very 、the last、all、no、little等词修饰时，只能用that。
This is the very book ______ I’m looking for .3).先行词被序数词修饰时，只能用that 。
This is the first nextbook ______ I studied in the middle school .4).先行词为最高级或被最高级修饰时，只能用that。
This is the most beautiful mountain ______ I have ever seen .=I have _____ seen _____ a beautiful mountian .5).先行词既有人也有物时，只能that 。
He told us many interesting things and persons _______ we had .2.先行词是物时，一般情况既可用that也可用which.但下列情况下，只能用which不用that。
英语定语从句讲解及练习
英语定语从句讲解及练习一、什么是定语从句定语从句是英语中一种常见的复合句结构，用来修饰名词或代词。
它通常由一个关系词引导，用来限定或描述先行词的属性、特征或状态。
定语从句的引导词有：who, whom, whose, which, that等。
二、定语从句的结构定语从句一般由三部分组成：1. 关系词：引导定语从句的词，如who, which等。
2. 先行词：定语从句所修饰的名词或代词。
3. 从句：包含主语和谓语，并与先行词之间存在关系的句子。
定语从句的位置可以是先行词之前或之后，具体位置取决于引导词的属性。
下面是一些定语从句的例子：- The man who is wearing a blue hat is my brother.who is wearing a blue hat is my brother.- The book which I bought yesterday is very interesting.which I bought yesterday is very interesting.- This is the house that Jack built.that Jack built.三、练请根据所给情景，完整地填入合适的定语从句。
1. The girl whose father is a doctor studies medicine at university.whose father is a doctor studies medicine at university.2. I have a friend who lives in London.who lives in London.3. This is the house that was built in the 18th century.that was built in the 18th century.4. The car which was stolen has been found by the police.which was stolen has been found by the police.5. The student whom I met yesterday is very friendly.whom I met yesterday is very friendly.四、小结英语定语从句是一种常见的句子结构，用于修饰名词或代词。
（完整版）定语从句全面详细讲解附练习题加答案
（完整版）定语从句全面详细讲解附练习题加答案定语从句详细讲解（一）定义及相关术语1．定语从句：修饰某一名词或代词的从句叫定语从句。
定语从句一般紧跟在它所修饰的先行词之后。
2．先行词：被定语从句修饰的词叫先行词。
3．关系词：引导定语从句的词叫关系词。
关系词有关系代词和关系副词。
关系代词有that, which, who, whom, whose, as等；关系副词有when, where, why等。
关系词通常有下列三个作用：A、引导定语从句；B、代替先行词；C、在定语从句中担当一个成分。
例如：The man who is shaking hands with my father is a policeman. 该句中，who is shaking hands with my father 是定语从句，修饰先行词the man，“who”是引导定语从句的关系词，代替先行词the man，在定语从句中作主语。
（二）关系代词引导的定语从句1．who 指人，在定语从句中作主语。
The boys who are playing football are from Class One. 正在踢足球的男孩是一班的。
Those who want to go to the museum must be at the school gate at 7 tomorrow morning. 想去博物馆的人必须在明晨7点到大门口集合。
Yesterday I helped an old man who had lost his way. 昨天我帮助了一位迷路的老人。
That is the teacher who teaches us physics. 那就是教我们物理的老师。
2．whom 指人，在定语从句中做宾语，常可省略。
Mr Liu is the person ( whom ) you talked about on the bus. 刘先生就是你们在公共汽车上谈论的那个人。
【英语】英语定语从句解题技巧讲解及练习题(含答案)含解析
【英语】英语定语从句解题技巧讲解及练习题(含答案)含解析一、定语从句1．The teenagers like the musician ____ different kinds of music.A．who play B．which plays C．who plays D．that play【答案】C【解析】【分析】【详解】试题分析：句意：青少年喜欢演奏不同种类音乐的音乐家。
The musician是先行词，后面跟的是它的定语从句。
先行词musician指人，用who、that引出定语从句，Ｂ错；关系词在定语从句中作主语，定语从句的谓语与先行词保持一致。
musician是单数，谓语用单数：plays。
故选C。
2．—Have you watch the TV play ＂ In the name of people＂（人民的名义）?—Yes. It’s the most popular play _________ shows our Party’s trying to struggle against corruption（反对腐败）.A．where B．whether C．that D．who【答案】C【解析】句意：——你看电视剧“人民的名义”了吗？——是的，它是表现我们的党尽力反对腐败的最受欢迎的电视剧。
这是一个定语从句的句子，先行词是play，所以引导词用that/which；故选C3．Music is the only thing ______ can help me to relax after a long day of hard work. A．which B．that C．who【答案】B【解析】【详解】句意：音乐是可以在努力工作的一天后，帮助我放松的唯一一件事。
which修饰事物，引导定语从句；that修饰事物，引导定语从句；who修饰人，引导定语从句。
此处修饰先行词thing，有the only修饰，故用that引导定语从句。
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定语从句基本知识所谓从句，就是一个主谓结构相当于整个句子(这样的句子叫复合句)的一个成分，因此，从句不能单独使用。
在复合句中修饰名词或代词、作定语的句子叫定语从句。
定语从句是中国人学英语的难点之一。
其实定语从句很有规律，总结如下:在关系代词中that既可指人又可指物、既可作主语又可作宾语，因此，除了在非限定性定语从句中，用that一般不会出问题。
关系副词的用法比较单一，它们从句中只起状语的作用，表示时间的就用when，表示地点的就用where，而why只修饰一个词，即reason。
定语从句所修饰的词叫“先行词”，因为它总是处在定语从句的前头，比定语从句先行一步。
引导定语从句的词叫关系词，包括关系代词和关系副词。
关系代词：who，which，that作从句的主语whom，which，that作从句的宾语(可省略)whose从句中作定语关系副词：When, where, why 在从句中作状语一、关系代词引导的定语从句1. That:代表的先行词为人或物，在从句中做主语，宾语和表语。
He is the man that is good at English.There are some films that I’d like to see.He isn’t the boy that he used to be.注意：that引导定语从句时：1）作宾语时that可省略。
2）That前不可用介词。
在定语从句中，下列情况的关系词宜用that而不用which1) 当先行词被all, every, no , some, few , little, much, both等修饰时，例如：This is all that I want to say at the meeting.2) 当先行词被the last , the very 和the only修饰时。
例如：This is the very pen that I am looking for.3) 当先行词有序数词时。
例如：You are the first person that I want to ask for.4)当先行词为anything、everything、nothing时，例如：Everything that can be done has been done.5) 先行词有最高级形容词修饰时，例如：Edison was one of the greatest inventors that ever lived.6) 当先行词既指人又指物时。
例如：The professor and his achievement that I heard about are admired by them .2.which: 代表的先行词为物，在从句中做主语，宾语The film which I saw last night was wonderful.Guilin is a city which has a 200-year history.注意：1）作宾语时，which可以省略。
2）Which 也可以代替前面的一个句子或句中的一部分定语从句中用用which而不用that的情况1). 在非限制性定语从句They have three houses, which are built of stone.2). 当关系代词前有介词时This is the factory in which we once worked.3). 当关系代词后面带有插入语时Here is the English grammar book which, as I have told you, will help improve your English.I've bought you some books which I think may interest you.3.who; :代表的先行词为人，在从句中做主语和宾语。
Where is the man who was here?He is the man who I talked with just now.4.whose; 代表的先行词为人或物，在从句中做定语。
I saw the man whose face is red.This is the window whose glass was broken.5.whom: 代表的先行词为人，在从句中做宾语.Where is the man whom I met this morning ?只用who, whom.而不用that的情况如果先行词是anyone, anybody, everyone, everybody, someone, somebody, those, ones等时，关系代词应该用who 或whom，例如：Is there anyone here who will go with you?6. 在same, so和such之后，定语从句用as引导，例如：I’ve never heard such stories as he tells. 我从来没听说过他讲的这种故事。
I shall be surprised if he does this in the same way as I do.注意：1). 当先行词由the same修饰时，偶尔也用that引导定语从句，但是和由as所引导的定语从句意思不同①She wore the same dress that she wore at Mary’s wedding.②She wore the same dress as her young sister wore.2). So/ such … as 与so/ such … that 的区别This is so interesting a book that I can't put it down.This is so interesting a book as I can't put down.二、关系副词引导的定语从句关系副词引导定语从句在从句中分别表示时间．地点或原因。
关系副词when在从句中充当时间状语，where 充当地点状语，why充当原因状语。
1. when指时间，在定语从句中做时间状语The time when we got together finally came.注意：当先行词为by the time ,any time , the way, every time, the first time ,the last time 时，关系词不用when而用that或者省略This is the last time that I shall give you a lesson.By the time he was 14 he had learned advanced mathematics2. where指地点，在定语从句中做地点状语Shanghai is the city where I was born.3. why指原因，在定语从句中做原因状语Please tell me the reason why you missed the plane.是用关系代词还是用关系副词：用关系代词还是用关系副词；一要看关系词在从句当中作什么成分；二要看关系词所代表的是人、物、时间、地点还是原因；三要看所引导的是限定性定语从句还是非限定性定语从句。
所以同样的先行词会有不同的关系词，这是因为关系词在从句当中担当的作用不同而决定的。
This is the room where/in which we’ll celebrate the New Year.这是我们将要在里面庆贺新年的房间。
（充当地点状语）This is the room(that /which)we’ll celebrate the New Year in.这是我们将要在里面庆贺新年的房间。
（充当介词宾语，可省略。
）This is the room which /that will be used for the celebration of the New Year.这是那个将要被用来庆贺新年的房间。
（充当主语）This is the room (which/that) we’ll use for the New Year dinner party.这是我们将要用来举行新年晚宴的房间。
（充当宾语，可省略。
）三、一些特殊形式1. 以the way为先行词的定语从句通常由in which, that引导，而且通常可以省略。
The way in which/ that/./ he answered the question was surprising.2. 先行词是situation，stage，case，point等名词，强调一个特定的地点或场合时，关系副词用where We're just trying to reach a point where both sides will sit down together and talk.Can you think of a situation where this phrase can be used.四、非限制性定语从句定语从句有时跟先行词的关系并不十分密切，只是作一些附加说明，不起限制作用，这种从句称为非限制性定语从句。
这类从句往往用逗号与主句分开。
China, which was founded in 1949, is becoming more and more powerful.2. as和which指整个主句的内容，引导非限制性定语从句的区别as和which指整个主句的内容，引导非限制性定语从句有时可以通用。
1）as引导的定语从句可以位于句首、句中；which 引导的定于从句一般只位于句中，不置于句首。
As we have seen, oceans cover more than 70％of the earth.China is a country which has a long history.2）as用于引导定语从句时，具有“正如……、像……、由……而知”等语义。
如：He was strongly against the plan, as could be expected.As he hoped, he saw the girl.3）as引导的定语从句常与know, see, report, say, expect, announce等动词连用______ we all know ,China is a country with a long history.China is a country with a long history, _______is known to us all.Tom did not pass the exam, ________ made his mother very angry.The road was too slippery, _______ caused lots of accidents.五、"介词+关系代词"引导的定语从句"介词+关系代词"引导的定语从句是同学们学习定语从句中的难点之一.这种定语从句多用于正式文体中,其使用的关系代词一般是which, whom,间或是whose,它既可以引导限制性定语从句,又可以引导非限制性定语从句.常见的有以下几种结构:1. "介词+关系代词".例如:In Barcelona the Chinese team got 16 gold medals, of which 12 were won by women.2. "名词+介词+关系代词".这种结构常可替换为"whose +名词"结构.例如:I have a dictionary, the cover of which is black.(= I have a dictionary of which the cover is black.)(= I have a dictionary whose cover of black.)我有一本字典,它的封面是黑色的。