关于定语从句关系词(连接词)的比较完整版
关于定语从句关系词（连接词）的
where引导的定语从句的先行词
where在定语从句中引导的先行词 一、where定语从句修饰抽象名词point You reach a point where medicine can’t help. 你已到了药物无法治疗的地步。The crisis has reached a point where the receiver will have to be called in. 危机已达到非把破产管理人叫来不可的地步。 We have reached a point where a change is needed. 我们到了必须改一改的地步。 注：有时point也可以是具体的地点： Let the point where AB cuts CD be called E. 设AB线与CD线的相交点为E。The accident happened at the point where the A15 joins the M1. 事故发生在A15与M1交叉的十字路口。 二、where定语从句修饰抽象名词case There are cases where the word “mighty” is used as an a dverb. 在一些情况下，mighty一词可用作副词。 Today, we’ll discuss a number of cases where beginners of English fail to use the language properly. 今天，我们将讨论一些英语初学者对英语使用不当的问题。 三、where定语从句修饰抽象名词activity Those successful deaf dancers think that dancing is an activity where sight matters more than hearing. 那些失聪的成功舞蹈演员们认为，舞蹈是一种让人看胜过让人听的活动。 四、where定语从句修饰抽象名词situation He got into a situation where it is hard to decide what is right and wrong. 他陷入一种难以分辨是非的局面。 If you risk something important, you cause it to be in a dangerous situation where you might lose it. 你如果拿重要的东西去冒险，那你就是将它置于一种可能会失去它的危险境地。 五、where定语从句修饰抽象名词position
定语从句中介词+关系词
“介词+关系词”的用法 1、关系代词在从句中作介词的宾语时，介词常可以提前，但介词提前时，关系代词只能用which 或whom。 如：The school (that/which) he once studied in is very famous. →The school in which he once studied is very famous. Tomorrow I will bring here a magazine (that/which) you asked for. →Tomorrow I will bring here a magazine for which you asked. We'll go to hear the famous singer (whom/that/who) we have often talked about. →We'll go to hear the famous singer about whom we have often talked. 2、关系副词when, where, why 和介词+which之间的关系。 关系副词when, where, why可以用适当的介词+which来替代。介词的位置非常灵活，有时放在关系代词之前，有时放在动词之后。如：when=in/on/at…+which, where=in/on/at…+which, why=for+which ） 如：I won’t forget the date when( on which) I was born. This is the room where (in which) I lived. = This is the room which I lived in.
语法高一英语必修一定语从句专项练习题定语
语法高一英语必修一定语从句专项练习题定语 TTA standardization office【TTA 5AB- TTAK 08- TTA 2C】
【语法】高一英语必修一定语从句专项练习题定语从句专项练习题E x e r c i s e1:默写定语从句的相关知识点定语的基本感念: 定语在句中位置: 定语的表现形式: 从句的基本概念: 定语从句: 先行词: 引导词: 关系词的作用: 关系代词: 关系副词: Exercise 2: 指出下列句子中的定语由什么担当，并说明与修饰词的位置关系。T h e b l a c k b i k e i s m i n e.形容词b l a c k作名词b i k e的前置定语W h a t’s y o u r n a m e I h a v e5b o o k s.
T h e r e i s a s l e e p i n g b o y i n o u r c l a s s r o o m. T h e y m a d e p a p e r f l o w e r s. T h e b o y i n t h e r o o m i s J a c k. I h a v e s o m e t h i n g t o d o. I t i s a s w i m m i n g p o o l. T h e r e i s s o m e t h i n g w r o n g. T h e l e s s o n wh i c h w e s t u d i e d y e s te r d a y w a s h a r d to u n d e r s t a n d. T h i s i s t h e g i r l w h o m I m e t i n t h e s t r e e t. E x e r c i s e3:指出下列句子中关系词的三个作用 1. He is the man whom I met yesterday.他是我昨天在街道上遇见的那个人。 关系代词whom，引导后面的定语从句，代替先行词the man在定语从句I met ( ) y e s t e r d a y.中作m e t的宾语。 k n o w t h e m a n w h o l i v e s n e x t d o o r.我认识住在隔壁的那个人。 will never forget the day when she got married. 她永远不会忘记她结婚的这一天。 showed me the article that he had written.他把他写的文章拿给我看。
定语从句中关系副词的用法
定语从句中关系副词的用法 关系副词，顾名思义，是联系先行词和定语从句的词，属于副词。定语从句中的关系副词有三个：when, where和why，它们在定语从句中分别作时间、地点和原因状语。其句法结构如下： 表时间的名词+ when + 定语从句 when指时间，在定语从句中作时间状语。 例句：I still remember the day when I first came to Beijing. I’ll never forget the day when I joined t he army. 表地点的名词+ where + 定语从句 where指地点，在定语从句中作地点状语。 例句：The factory where his father works is in the west of the city. This is the house where I lived two years ago. 表原因的名词reason + why + 定语从句(why只用于reason之后的限制性定语从句中,在定语从句中作原因状语。) 例句：That is the reason why I did the job.(在现代英语中why可以省略) 上句也可以这样表示： That is the reason I did the job. 又如：This was the reason (why )we raised the temperature. 关系副词在定语从句中的用法看似简单，以下注意点不可忽视： 1）“when”、“where”和“why”的运用取就于表时间的名词、表地点的名词和表原因的名词reason在定语从句中所作的成分，比较下面的几组句子： *I will never forget the day when I first met you on the seashore. *I will never forget the days which/that we spent together in Xueyao Middle School. **This is the hospital where my mother works. **This is the hospital which/that we visited the day before yesterday. ***The reason why he did not go to school is that he was ill. ***This is the reason which/that he gave his boss in the office . 2) “when”、“where”和“why”都可以替换成“介词+ which”，介词的选用取就于先行词和定语从句中的动词。例如： Do you still remember the day on which we first met in Nantong?(on which= when) This is the room in which we lived last year.(in which=where) Do you know the reason for which he refused to go to Mary’s birthday party. (for which=why) 有时定语从句中介词短语和动词有意义紧密的修饰关系，尤其在非限制性定语从句中，常使用“介词+ which”结构，而不使用关系副词。例如： My mother works in a factory, in front of which there is a small river. At night the soldiers got to a small hill, at the foot of which stood a farmhou se. 3) 关系副词“when”、“where”既可引导限制性定语从句，也可引导非限制性定语从句。
如何正确选用定语从句关系词
如何正确选用定语从句关系词 关系词的选用让许多学生摸不找头脑，下面我将介绍我的经验。我把关系词的选用分为两个步骤： 第一步、看定语从句中缺少什么成分以确定是选用关系代词还是关系副词。如果定语从句中缺少主语、宾语、定语或表语时，则这个关系词应是关系代词；如果定语从句中缺少时间状语、地点状语或原因状语，那么我们应该选用关系副词。如： This is the book ____ I want. 此句定语从句是I want，经分析，want 是个及物动词，须带宾语，也就是说，定语从句中缺少宾语，由此我们可知空上所填应是关系代词。这就是第一步，确定关系代词还是关系副词。 第二步、看先行词。要弄明白先行词是指人还是指物以及是否受到序数词、最高级等词的修饰以进一步圈定先行词。如在上面例句中，先行词是the book, 是指物且无其他的修饰词，由此我们可以判断关系代词可用which 或that。 通过以上这两个步骤我们就可以确定关系词，但有一点要注意，这两个步骤的顺序不可以弄错，一旦弄错很容易陷入误区。如：This is the reason ____he explained to us. 如果学生先看先行词很容易选用why,而实际上从句中缺少宾语应选用关系代词，这一点就可以排除关系副词why。比较下面两个句子：
○1. Do you still remember the chicken farm ____ we visited three months ago? ○2. Do you still remember the chicken farm ____ we stayed three months ago? 这两个句子看似无差异，但答案不一样。我们按照以上所说步骤顺序来进行分析：在例1 中，定语从句的谓语visited, 是及物动词，其后应接宾语，换句话说，定语从句中缺少宾语应选用关系代词，然后看先行词，the chicken farm 指物且无序数词、最高级等特殊修饰词修饰，所以关系代词应是that 或which；而例2 中，定语从句的谓语是不及物动词stayed，不能接宾语，也就是从句中缺少状语，且先行词是表示地点的名词，所以它的答案是关系副词where。如果我们先看先行词来进行选择，很可能会走进误区。 总而言之，我们同学需要在以后的学习中逐步掌握它的用法，细细体会它的精髓。
定语从句分类详解
定语从句 一、限制性与非限制性定语从句 （一）限制性定语从句与非限制性定语从句的区别 限制性定语从句对先行词起修饰限制作用；而非限制性定语从句是对先行词起补充说明作用。非限制性定语从句中，先行词与定语从句往往有逗号割开。非限制性定语从句相当于并列句、状语从句等。如： I want this man, who (=for he) can speak English. He gave up the plan, which (=though it) was a very good one. I met John, who (=and he) told me the news. I will take this one, which (=for it) seems to be the best one. He has two sons, who work in the same pany. (He has only two sons.) He has two sons who work in the same pany. (Perhaps he has more than two sons.) (二)非限制性定语从句中关系代词和关系副词的用法 1、关系代词和关系副词在任何情况下都不能省略； 2、Who（主语），whom（宾语），which（主语、宾语）不能用that代替，也不能互相替 换； 3、介词+which/whom+从句结构中，介词不能移到从句的后面； 4、when, where可用于非限制性定语从句。 二、关系代词的用法 （一）关系代词的作用和分类 1、关系代词的作用有三个： （1）连接作用：关系代词引导从句，把它和主句连接起来； （2）替代作用：关系代词在从句中替代它前面的先行词； （3）成分作用：关系代词在从句中总是充当句子成分。 2、关系代词的用法分类 关系代词的用法与分类有三点依据： （1）根据所引导的从句的限制性和非限制性； （2）根据所替代的先行词是指人还是指物； （3）根据它在从句中所充当的成分----主语、宾语、表语或者定语。 （二）关系代词that和which的用法 1、限制性定语从句中，必须用关系代词that的情况： （1）当先行词是不定代词all, much, little, something, everything, anything, nothing, the one时。如：
定语从句之关系词的选择
定语从句之关系词的选择 一、复习： 1.定语从句的定义:在复合句中，修饰某一名词或代词的从句叫做定语从句。 2.先行词：被修饰的名词或者代词叫做先行词。 3.关系词：引导定语从句的词叫做关系词。 4.关系词：关系代词：which,that,who,whom,whose 关系副词：when,where,why Eg. This is the book___________my father bought for me.（物，宾语） This is a book________has 199 pages.(物，主语) He is the man__________bought a book for me.（人，主语） The boy_________his father bought a book for is Bob.（人，宾语） The boy_________father bought a book for him is Bob.（人，定语） The book________color is red is Bob’s.(物，定语) The visited the town________I lived.(地点状语) They visited the town________I liked.(物，宾语) I will never forget the day_______Obama met Bao Zheng.(时间状语) I will never forget the time________I spent on campus.(物，宾语) That was the reason_______he gave me yesterday.(物，直接宾语) That was the reason________I began to learn photoshop.(原因状语) 关系代词和关系副词用法总结 关系词先行词关系词在定语从句中的成分which 物主语，宾语（可省略） that 人，物主语，宾语（可省略） who 人主语 whom 人宾语（可省略） whose 人，物定语 when 时间状语 where 地点状语 why 原因状语 二、关系词选择两步骤。 1.看先行词是人还是物。 2.看先行词在从句中所处的地位：主语，宾语，定语——关系代词；状语-----关系副词
定语从句先行词
定语从句确定先行词 最简单的方法：看从句缺什么成分。 比如： 1.He is the policeman who caught the thief the other day. 去掉who后，从句缺主语：caught the thief the other day.所以who充当主语。 2.He is the policeman that I met yesterday. 去掉that后，从句缺宾语：I met yesterday.所以that充当宾语。 3.I like the book whose cover is dark green. 去掉whose后，从句缺定语：(Its) cover is dark green.故whose充当定语。 4.The temple where he used to live has been destroyed. 去掉where后，从句缺状语：He used to live (in the temple).故where充当状语。 如果仅仅是想区分主语或宾语，还有一种简便的方法，就是看关系词后是什么词性的词，后面是名词（主语）的话先行词就是宾语，是动词（谓语）的话先行词就是主语。 如： 1.Father is talking to the man that has stayed here for a long time. 句中that后是谓语动词，所以that就充当主语，可以用who来代替。
2.Father is talking to the man that we are afraid of. 句中that后是名词（主语），所以that就充当宾语，可以用whom来代替。
定语从句关系代词选择例句
This is a date that we are all proud of. This is a place ( where) my father has worked. This is a place ( which) my father has lived in for 12years. This is a place (which ) my father has visited several times.
1. This is the ring (on which) she spent 1000 dollars. 2. I can’t remember the age (at which)he won the prize. 3. be clear about the job for which you are applying.
4.This is the house (about which) I wrote to you. 2.There are two doors, one of which leads to the living room. This is the book /which that I bought yesterday. This is the book ( whose )cover is
colorful. 1. The news (that)was reported in the article is incorrect. 2. The news (that)he was resigning is incorrect.
高一英语必修一定语从句1
定语从句 一、基本概念 1．定语从句：在一个主从复合句中修饰某一个名词、代词或修饰整个主句的从句叫定语从句。换句话说，定语从句就是用来作定语的句子。 2．先行词：被定语从句修饰的名词或代词叫先行词。先行词前一般用the ，但在指“一个”概念时可用 a , an 。 3．关系代词 / 关系副词：连接先行词和定语从句的词叫关系词，根据其在从句中作用分为关系代词或关系副词。若先行词在从句中作主语、宾语和定语等，应用关系代词引导定语从句；若先行词在从句中作时间状语、地点状语和原因状语等，应用关系副词引导定语从句。4．定语从句的位置：一般紧跟在先行词后面。但有时因句子结构的需要，定语从句和先行词被某些成分隔开。 5．引导定语从句的关系词分为二类： 关系代词：that, which ,who, whom ,whose , as 关系副词：when, where, why 二、基本用法 1．关系代词的基本用法（见下表）：
2．使用关系代词时应注意的几个问题： a. 在以下几种情况下只使用that不用which。 1.先行词是不定代词时，如: all, anything, everything, nothing, something, little, few, much。 told him all (that) I know. gave her everything (that) he had. 2.先行词被all, every, any, the very, the only, the just等修饰时。 have read all the books (that) you gave me. can take any book (that) you like. 3.先行词被序数词和形容词的最高级修饰时。 1. This is the best book (that) I have ever read. 2. The second place (that) I want to visit is Shanghai. 4.先行词既有人又有物时。 talked about the persons and things (that) we remember in the school. people and the animals that were killed in the earthquake have all been found. 5.在Who, Which引起的疑问句中。 1. Who is the boy that helped you? 2. Which is the book (that) you bought yesterday? 6. 若有两个定语从句，一个用which引导，另一个须用that引导。 He bought a book which could give him knowledge and that could help to kill the time. 7.当先行词在定语从句中作表语时。 Mary is no longer the girl (that) she used to be. b.在以下几种情况下只使用which 不用that。 1. 引导非限制性定语从句时。 I have lost my pen, which I like very much. (which 作宾语，指代主句中的pen) New concept English is intended for foreign students, which is known to all of us. (which作主语，指代整个主句) 2. 若有两个定语从句，其中一个关系代词是which，另一个须用that。 The book (that) he bought yesterday was the one (which) he liked best. 3. 先行词在句中作介词宾语且介词前置时。 This is the house in which Lu Xun once lived. c.当先行词为指人的关系代词时,引导词只用who 不用that。 1.先行词为all, anyone, one / ones, those, people 时，须用who。 1. Anyone who knows how to do it can do it now. 2. Those who want to see the film please put up your hands. 3. He, who does not reach the Great Wall, is not a true man. 2. 在非限制性定语从句中，须用who。 Tom’s father, who is over sixty, still works hard.
定语从句关系代词的具体用法
锐思教育学科教师辅导教案 辅导科目: 英语学员姓名：年级: 学科教师：韩海霞课时数：第次课 授课主题定语从句中关系代词的具体用法 1，复习定语从句的基本结构和关系词的用法 教学目标 2，掌握定语从句中关系代词的具体用法 授课日期及时段 教学内容 一，导入 复习上节课的学习的定语从句的基本内容，关系词的选择以及做题方法。 1，定语从句的基本结构：先行词+关系词+定语从句（关系代词一般位于定语从句的句首） 2，关系词可以分为关系副词和关系代词： 关系副词共有三个，在定语从句中作状语。when 表示时间，在定语从句作时间状语；where 表示地点，在从句中作地点状语；why 表示原因，在定语从句中作原因状语，其先行词只有表示原因的reason 一词。 关系代词that 、which 、who 、whom 、whose 、as 的具体用法 人物主语宾语that √√√√ which ×√√√ who √×√√ whom √××√ whose 只能在从句中作定语，可以指人也可以指物。As 用在一些特定的结构中，as you know 3，选用关系词的做题方法，一“找”，二“还”，三“替换”。 一“找”：就是先把句子分为主句和从句两部分，再找出先行词和关系词。 二“还”：根据先行词提示的意思，大胆地把定语从句还原为完整的一句话。（可以添词） 三“替换”：用关系词替换定语从句中还原后添加的部分，作主语和宾语用关系代词，作状语用
关系副词。（时间状语用when ，地点状语用where, 原因状语用why ） 练习： 1，【2014 湖南】I am looking forward to the day C my daughter can read this book and know my feelings for her. A. as B. why C. when D. where 2，【2011 陕西】I walked up to the top of the hill with my friend, B we enjoyed a splendid view of the lake. A. which B. where C. who D. that 3，【2013 山东】Finally he reached a lonely island C was completely cut off from the outside world. A. when B. where C. which D. whom 二，关系词只能有that 的情况（关系副词不受以下规则影响） 考点一：先行词是anything, something, nothing, everything 等不定代词时 1，He never reads anything is not worth reading. A. which B. as C. who D. that 2【，2010 全国2】I refuse to accept the blame for something was someone else ’s fault. A. who B. that C. as D. what 考点二：先行词是all, much ，l ittle, none 或先行词被all, much, little, no, any 修饰时 3，【2014 陕西】Please send us all the information you have about the candidate for the position. A. that B. which C. as D. what 4，You can take any seat is free. A. that B. / C. which D. it 考点三：先行词被序数词的最高级以及the first, the last, the very, the only, the same 修饰时5，The most important thing D we should pay attention to is the first thing I have said. A. which; that B. that; which C. which; which D. that; that 6，It’s the third time C late this month.
定语从句 之 先行词 (含答案解析)
定语从句之先行词 综合练习 一、句子翻译（本大题共4小题，共8.0分） 1.分析再翻译：看下面的句子，分别找出各句的先行词和关系代词，并指出引导词在 句子中作什么成分，然后将句子译成汉语 (1)This is the stranger who helped us yesterday. 先行词：________；关系代词：________；关系代词在从句中作________。 译文： ______________________________________________________________________ (2)The boy whom the teacher often praises is their monitor. 先行词：________；关系代词：________；关系代词在从句中作________。 译文： ______________________________________________________________________ (3)Fruit trees which once grew only in China can be found in many parts of the world. 先行词：________；关系代词：________；关系代词在从句中作________。 译文： ______________________________________________________________________ (4)The gold medal which she won has been given to her old school. 先行词：________；关系代词：________；关系代词在从句中作________。 译文： ______________________________________________________________________ (5)The woman that I read about in the newspaper has just won a gold medal. 先行词：________；关系代词：________；关系代词在从句中作________。 译文： ______________________________________________________________________ (6)The report that was handed in by Mr Turner was about the motor race. 先行词：________；关系代词：________；关系代词在从句中作________。 译文： ______________________________________________________________________
定语从句关系词的选择方法
定语从句关系词选择方法 彭玉翠 选题背景： 定语从句为高中教学中的一个重点，也是学生在语法填空或改错题中容易遇到的一个难点。在老师讲解完定从后，学生对关系词的选择似懂非懂，特别是中下等程度的学生。为此，今天特意挑选定语从句中关系词的选择方法为我上课的主要内容，希望有助于学生选择定从中正确的关系词。 教学目标 1. Knowledge aim: review the attributive clause 2.2. Ability aim:To develop the skills to choose correct relative words in the attributive clause 3.3. Emotional aim: let students realize the importance of relative words in the attributive clause 教学重难点 (1) Teaching important point 4.Help Ss to understand realize the importance of relative words in the attributive clause (2) Teaching difficult point 5.How to teach Ss’ to choose correct relative words in the attributive clause 教学过程： Step1:Revision :定语从句是在复合句中起定语作用，修饰某一名词或代词的从句。被定语从句修饰的词叫________。引导定语从句的关系词有关系代词（_____ _____ _________ ______ _____等）
定语从句之先行词(含答案解析)
. 定语从句之先行词 综合练习 一、句子翻译（本大题共4小题，共8.0分） 1.分析再翻译：看下面的句子，分别找出各句的先行词和关系代词，并指出引导词在 句子中作什么成分，然后将句子译成汉语 (1)This is the stranger who helped us yesterday. 先行词：________；关系代词：________；关系代词在从句中作________。 译文： ______________________________________________________________________ (2)The boy whom the teacher often praises is their monitor. 先行词：________；关系代词：________；关系代词在从句中作________。 译文： ______________________________________________________________________ (3)Fruit trees which once grew only in China can be found in many parts of the world. 先行词：________；关系代词：________；关系代词在从句中作________。 译文： ______________________________________________________________________ (4)The gold medal which she won has been given to her old school. 先行词：________；关系代词：________；关系代词在从句中作________。 译文： ______________________________________________________________________ (5)The woman that I read about in the newspaper has just won a gold medal. 先行词：________；关系代词：________；关系代词在从句中作________。 译文： ______________________________________________________________________ (6)The report that was handed in by Mr Turner was about the motor race. 先行词：________；关系代词：________；关系代词在从句中作________。 译文： ______________________________________________________________________
高中英语如何选择定语从句的引导词
如何选择定语从句的引导词 *限制性定语从句 限制性定语从句修饰先行词，对先行词起修饰作用，紧接先行词之后，无逗号，若省去，原句意思不完整。引导定语从句的关系代词有who,whom,whose,which,that等。 who,whom,whose用于指人，whose有时也可指物，相当于of which；which用于指物；that 既可指人也可指物，但只用于限制性定语从句中。关系代词除了引导定语从句，替代先行词外，还在从句中担任主语、宾语、定语等。 *非限制性定语从句 非限制性定语从句既可修饰先行词，也可修饰整个主句，起补充说明作用，与主句之间有逗号隔开，若省去，原句意思不受影响。不可用that引导非限制性定语从句。关系词不可省略。 一、定语从句的引导词有关系代词who，whom，whose，which，that，as；关系副词when，where，why。定语从句中引导词的选用主要看先行词在定语从句中作什么成分或者是定语从句中缺什么成分。 1．定语从句中缺主语，修饰人时用who ／that，修饰物时用which ／that引导。如： Is this the factory which ／that makes TV sets？ The man who ／that visited our school is from Australia． 2．从句中缺宾语，修饰人时用who ／whom ／that或省略引导词；修饰物时用which ／that或省略引导词。如： Gone are the days which ／that we spent together in the village． He is the man who ／whom ／that I think to be worthy of our praise． 3．从句中缺时间状语，用when或介词＋which引导。如： The day finally came when ／on which I was given a job． We'll put off the outing until next week，when we won't be so busy． 4．从句中缺地点状语，用where或介词＋which引导。如： Please put the letter on the desk where ／on which he can easily find it． 5．从句中缺原因状语或先行词是reason时，引导词用why ／for which ／that。如：This is the reason why ／for which ／that he didn't come to the meeting．
如何判断定语从句关系词
如何辨别定语从句的关系词 塘桥中学包小波 同学们，你们知道以下这些谚语吗？ It’s the first step that costs. 万事开头难。 Not all that glitters is gold. 闪光的未必都是金子。 He who would climb that ladder must begin at the bottom. 千里之行，始于足下。 A good book is a best friend who never turns back upon us. 好书如挚友，情谊永不变。 在这些句子中，你发现什么共同点了吗？对了，这些句子都运用了定语从句。定语从句在复合句中的作用相当于形容词，在句中作定语，修饰前面的名词或代词。斜体加粗的单词都被称为关系词，也叫引导词。被定语从句修饰的词称为先行词，就是上述谚语中有下划线的单词，定语从句一般放在先行词的后面。 要想掌握定语从句，就必须了解引导定语从句的关系词。关系词分为关系代词和关系副词。关系代词有who，whom，whose，that，which和as，关系副词有when，where和why，他们在先行词和定语从句之间起联系作用，同时在意义上代表先行词，并在定语从句中担任某个成分。 我们要辨别定语从句中不同的关系词，必须掌握以下的方法。 一、关系代词的用法 1．普通代词与关系代词的区别 例如： I have a brother. He likes playing the piano.（合并为一句） I have a brother who/that likes playing the piano. 简单句中的普通代词he起了指代前一句中brother的作用，并且是本句的主语，两个句子都是独立的。而两句合并后，句中的关系代词who/that除了代替先行词brother之外，它还在定语从句中担任了一定的成分，同时连接先行词与它引导的定语从句。 2．who指人,做主语。 例如：The person who is in blue will go to the concert with me tomorrow. 本句中的who充当从句中的主语, 划线部分是从句。当who作为定语从句的关系代词在句中充当主语或宾语时，都可以用that来替代。 3．who/whom指人,做宾语。 例如：The man who/whom I look after is my father. 在例句中，who/whom做从句中介词with的宾语，这个句子也可以写成The man with whom I talked is our teacher. 如果从句中介词提前，那么就不能用who或that，只能用whom引导从句了。这