who, which引导的定语从句在复合句中，修饰某一名词或代词的从句叫定语从句。它的作用相当于一个形容词。定语从句通常位于它所修饰的名词或代词之后，这一名词或代词叫先行词，引导定语从句的关联词为关系代词（副词）。这里主要介绍关系代词who与which的用法。
关系代词who（whom）和which均可引导定语从句，who用来指人，而which指物，在从句中充当主语或宾语。请看例句：
We shall never forget Mr Li who taught us English in the middle school. 我们永远不会忘记中学时教我们英语的李老师。(who在从句中作主语)
The man who(m) you saw last week has left the town. 上周你看见的那
个人已离开这个城镇了。（whom也可用who, 在从句中作saw的宾语）
【温馨提示】关系代词在从句中作宾语时，常可省略。如：
He told a story which moved us deeply. 他讲了一个使我们深受感动的故事。（which在从句中作主语）
This is a reason which we must not forget. 这是我们不能忘记的一个原因。（which在从句中作宾语）
需要指出的是关系代词which和that都可指物，一般情况下可以互换。如：
The house which / that you lived in is a very old building. 你住的那个房子是座古老的建筑。
但在下列情况中，通常用which, 不用that。
当先行词有指示代词修饰时。如：
The lady did not want that one which smelt terrible. 那位夫人不要气味难闻的那个。
当关系代词前有介词时。如：
The room in which my family live used to be a garage.我家住的房间以前是个车库。
当先行词本身为that时。如：
That which you told him about is what we want to know. 你告诉他的正是我们想知道的。
关于which引导从句的小结： 关系代词which 一般指物，在定语从句中作主语、宾语或定语，既可引导限制性定语从句，又可引导非限制性定语从句。 1. 引导限制性定语从句 A shop should keep a stock of those goods which sell best. [ stock存货] 商店应存有最畅销的货物。 This is the family which is planning to move to the city 这是要搬进城里的一家。 2. 引导非限制性定语从句。 （1 ）用来指代一个句子。 Internet is so interesting, which makes all possible happen. 因特网是如此有趣，它使任何事都有可能发生。 （2 ）用来指代句子的一部分。 When deep in thought, which he often was, he would forget all around him. 他常常陷入沉思，这时他就会忘掉周围的一切。 （3 ）如果要引导两个非限制性定语从句，第二个which 前要加and. He bought a book, which was written by LuXun, and which he decided to give to his friend. 他买了本鲁迅写的书，他决定送给朋友。
练习1. [1. board董事会 2. data资料,数据 3. shareholder 【英】股东 4. on behalf of代表 5. guard保护] The ability to guard customer data is the key to market value, which the board is responsible for on behalf of shareholders. which的先行词是谁？ 译文：保护客户资料的能力是市场价值的关键，董事会代表股东对市场价值负有责任。 【难点小结：1.介词短语 2.which 的先行词 3. 非限制性定语从句有时要翻译成一句话】 例2. 【1.semiconductor半导体 2. casualty伤亡，灭亡，覆灭 3.< A sit at the heart of B> A是B的核心】
which, who引导的定语从句 看下面的几个例句： It successfully shows the rich culture which makes Beijing so famous. 它成功地展示了使北京闻名遐迩的悠久文化。 The photo which we liked best was taken by Zhao Min. 我们最喜欢的照片是赵敏照的 先行词是物 It successfully shows the rich culture which makes Beijing so famous. 引导词在从句中作主语 先行词是物 The photo which we liked best was taken by Zhao Min. 引导词在从句中作宾语 由此，我们可以看出：which引导的定语从句修饰的是无生命的东西。which 在从句中的成分是可以作主语，也可以作宾语。 下面我们再看一个句子： 先行词是人 His father is the person who will be most unhappy. 引导词在从句中作主语 由此，我们可以看出： 如果先行词是人，那么定语从句的引导词就可以是who。 注意：当who 在从句中作宾语时，在现代语法规则简化为大多数情况下都可用who了。 如：Do you know Mr Zhang who(m) they like very much? 在先行词是物的定语从句中，一般情况下that和which都可以通用, 但在下列情况下, 一般用that而不用which。 (1)先行词为all, everything, nothing, something, anything, little, much 等不 定代词时。 I am sure she has something that you can borrow. (2).先行词被all, little, much, every, no, 等修饰时。 I’ve read all the books that are not mine. (3)先行词被序数词或最高级修饰时。 This is the first book that he has read (4)先行词被the only, the very, the same, the last修饰时。 This is the very book that belongs to him. (5)先行词为人和物的组合。 They talked for an hour of things and persons that they remembered in the
when 和 where 引导定语从句的用法 定语从句既是英语语法的一个重点，同时又是一个难点。说它是难点，主要难在两点上：一点是如何正确判断什么样的汉语句子要译为英语的带定语从句的复合句；另一点是定语从句的引导词较多(包括关系代词who, that, which, as 和关系副词when, where, why)，而且其用法也较复杂。那么到底什么情况下用when和where来引导定语从句呢？它们又该怎么用呢？下面就举例说明： 一、when：当主句中的先行词(即主句中被后面定语从句修饰的词)是表示时间意义的名词时，它只能作定语从句的时间状语，放在定语从句句首。如果定语从句的引导词是作该定语从句的主语或宾语，则要改用关系代词that或which来引导。例如： The days when we used foreign oil are gone. 我们用洋油的日子一去不复返了。 I'll never forget the day when I was born. (=I'll never forget my birthday.) 我永远不会忘记我出生的日子。 It happened in November when the weather was wet and cold. 这事发生在天气又湿又冷的十一月。 In the years that (which) followed, Marx kept on studying English and using it. 在这之后的几年中，马克思继续学习和使用英语。(that作定语从句"that followed"的主语) The day (that) I always remember in all my life is my birthday. 我一生中最难忘的日子是我的生日。(that作定语从句"that I always remember in all my life"的宾语，that可以省略)
定语从句中which和that用法 在定语从句中，which 和that 在指代事物时，一般可以互换使用，但并非在任何情况下都是这样。 一、宜用that, 而不宜用which 的情况. ①先行词为不定代词all,much,something,everything,anything,nothing,none,the one 等 1. We should do all that is useful to the people. 2. There's nothing that can be said about it. 3. Do you mean the one that was bought yesterday ②先行词被only, any, few, little, no, just, very, one of等词修饰时。 1 .The only thing that we could do was to wait. 2 .That's the very word that is wrongly used. 3 .The last place (that) we visited was the chemical works. 4 .You can take any (=whichever) seat that is free. 5 .I hope the little that I can will be of some help to them. ③先行词是序数词时或被序数词修饰时。 1. When we talk about Wuxi, the first that comes into mind is Tai Lake. 2. This is the third film that has been shown in our school this term. ④先行词是最高级或被最高级修饰时。 1. This is the best that can be done now. 2. The most important thing that should be done right now is how to stop him from going on. ⑤先行词既有人又有物，用which和who都不适合，这时宜用that. 如： writer and his novel that you have just talked about is really well known . rider and his bike that had run over an old woman were held up by the police. ⑥被修饰词为数词时. 1. Yesterday I caught two fish and put them in a basin of water .Now you can see the two that are still alive .
一、从句是如何出题的？ 1. 时态 2. 考连接词 3. 考语言顺序 二、学好从句的两个基本条件 1. 时态 2. 从句的三个必须:①必须是句子；②必须有连接词；③必须是陈述句 三、状语从句、宾语从句、定语从句重点 1.如何判断何种从句 2. 从句的时态 3. 从句的连接词与扩展 4. 经典单选、从句与选词、长句子分析 四、如何判断三种从句 1. 状语从句无先行词 2. 宾语(表语)从句无先行词有动词或词组 3. 定语从句先行词多为名词或代词 一、When引导的定语从句与时间状语从句的区分 1. when的译法不同。在时间状语中，when 翻译成“当……的时候” I want to be a teacher when I grow up. 当我长大的时候，我要做一名老师。在定语从句中，when不翻译。I won't forget the day when he says he loves me. 我不会忘记他说爱我的那一天。 2. 在时间状语中，when从句前面或后面是句子；定语从句中，when 从句不能位于句首，且通常when前为表示时间的名词day、year等。 3. when在从句的作用不同。在时间状语从句中，when是连词，只起连接主句和从句的作用，不做从句的任何成分。不过when引导的时间状语从句修饰主句的谓语，做主句的时间状语。 在定语从句中，when是关系副词，在从句中代替先行词做从句的时间状语，修饰从句的谓语。 例1 I will always remember the days when I lived with my
grandparents in the country. 例2 I always remember the days in the country when I see the photo of my grandparents. 点评：例1意为“我会永远记得跟我祖父母一起住在乡下的那些日子”，其中when 引导的是一个定语从句, 修饰the days, when在从句中作时间状语。例2意为“当我看到祖父母的照片时，总是会想起在乡下的那些日子”，其中when 引导的从句并不修饰前面的名词the country，因此可判定为时间状语从句。 例1中的when可用in which替代，即从句可改为...in which I lived with my grandparents in the country. 例2中从句前有名词，但根据句意可 知并不是从句所修饰的对象，也不能用“介词+ which”来替代。 二、判断关系代词与关系副词 方法一：用关系代词，还是关系副词完全取决于从句中的谓语动词。及物动词后面无宾语，就必须要求用关系代词；而不及物动词则要求用关系副词。例如： This is the mountain village where I stayed last year. 这是我去年呆过的山村。 I'll never forget the days when I worked together with you. 我永远不会忘记与你共事的日子。 判断改错： 1. This is the mountain village where I visited last year. 2. I will never forget the days when I spent in the countryside. 3. This is the mountain village （which）I visited last year.
定语从句中that与who的用法区别 1. 两者均可指人，有时可互换（包括当先行词为all, anyone, someone等，同时也包括先行词受the only 等的修饰时）： All that [who] heard him were delighted. 所有听了他讲话的人都很高兴。 He is the only one among us that [who] knows Russian.他是我们中间唯一懂俄语的人。 Anyone who [that] is over sixteen is allowed in. 任何超过十六岁的人都允许进去。 It is impolite to turn your back on someone who [that] is speaking to you. 人家跟你说话，你把背朝人是不礼貌的。 2. 但是在下列情况，通常要用that： ①当先行词是一个既指人又指物的并列词组时： I made a speech on the men and things that I had seen abroad. 我就我在国外所见到的人和事作了报告。 ②当先行词是who时(为避免重复)： Who was it that won the World Cup in 1982? 谁赢得了1982年的世界杯？ ③当关系代词在定语从句中作表语时(可省略)： Tom is not the boy (that) he was. 汤姆这孩子已不是以前那个样子了。 3. 但是在下列情况，通常要用who： 当先行词为those 且指人时，英语习惯上要用who 来引导定语从句。如： Those who do not wish to go need not go. 不愿去的人不需要去。 Those who couldn’t walk were carried on stretchers. 那些不能走的人都用担架抬着。 It is said that those who eat the most are the least healthy. 据说吃得最多的人身体最差。 Only those who had booked in advance were allowed in. 只有那些预先订票的人可以进去。 The plan was supported by those who wished to listen to more good English. 这计划受到想多听好英语的人的支持。 Let us spend a few moments in silence so that / in order that we remember those who died to preserve our freedom. 让我们默哀片刻，以缅怀那些为维护我们的自由而牺牲了的人们。 注：偶尔也可见到在 who 之后用that 引导定语从句的用例，但相当少见。如： The danger is that people who pay their bills on time will be lumped in with those that don’t. 危险的是那些及时付账的人将会同那些不及时付账的人混在一起。
江苏朱姝 关系代词 which 一般指物，在定语从句中作主语、宾语或定语，既可引导限制性定语从句，又可引导非限制性定语从句。下面就进行归纳总结： 1. 引导限制性定语从句 A shop should keep a stock of those goods which sell best. 商店应存有最畅销的货物。 This is the family which is planning to move to the party. 这是要搬进城里的一家。 2. 引导非限制性定语从句。 （ 1 ）用来指代一个句子。 Internet is so interesting, which makes all possible happen. 因特网是如此有趣，它使任何事都有可能发生。 （ 2 ）用来指代句子的一部分。 When deep in thought, which he often was, he would forget all around him. 他常常陷入沉思，这时他就会忘掉周围的一切。 （ 3 ）如果要引导两个非限制性定语从句，第二个 which 前要加 and. He bought a book, which was written by LuXun, and which he decided to give to his friend. 他买了本鲁迅写的书，他决定送给朋友。 3. 名词＋ of ＋ which （＝ of which ＋名词＝ whose + 名词）通常放在先行词的后面。
I'd like a room the window of which looks out over the sea. / I'd like a room of which the window looks out over the sea. / I'd like a room whose window looks out over the sea. 我要一间窗户面临大海的房间。 4. 介词＋ which 的替代作用。 （ 1 ）作时间状语替代 when 。 There used to be a time at which / during which （ = when ） the Chinese people struggled for freedom. 中国人曾有一段为自由而斗争的日子。 （ 2 ）作地点状语替代 where 。 This is the office in which （ = where ） I used to work. 这是我过去工作过的办公室。 （ 3 ）作原因状语替代 why 。 I'd like you to explain the reason for which （＝ why ） you were absent. 我想让你解释一下缺席的原因。 （ 4 ）作方式状语替代 that 或省略。 There are many ways in which （＝ that / 省略） we can solve the problem. 解决这个问题有很多方法。 5. which, when, where 关系词的选择。 关系副词 when 与 where 用于引导定语从句时，往往修饰句中表示地点或时间的名词。但是，有时候在表示时间或地点的名词后面却不能用 when 或 where ，而该用 which 或 that 。 Is this the factory which / that produces all kinds of washing machines （ which / that 在定语从句中作主语，指代前面的 the factory ）这就是生产各种洗衣机的那家工厂吗
定语从句中的that和which的用法 引导定语从句的关系代词有：that（指人或物）,which （指物）,who (指人）.指人时可用that或who ；指物时可用that 或which 。 That和which在从句里都可以做宾语和主语，做宾语时可以省略。指物时，两者一般可以互换，但在下列情况下只能用that： 1）当先行词是all ,any ,anything ,everything ,nothing 或被它们修饰时.例如： Is there anything that I can do for you 有什么可以为你做的吗? All that can be done must be done . 凡是能做的都必须做. 2）当先行词被形容词的最高级或序数词修饰时.例如：That is one of the most interesting books that are sold in the bookshop . 那是这家书店出售的最有趣的书之一. The first thing that we should do is to get some food . 我们该做的第一件事是弄点吃的. 3）当先行词有：the only ,the very ,the same ,the last 等修饰时.例如：
My necklace is not the only thing that's missing . 我的项链不仅是丢掉的东西. 4）当主句以who或which开头时,定语从句中引导词用that ,不用which 或who .以避免重复.例如： Who is the girl that is wearing a red coat 正穿一件红色外套的女孩子是谁? 5）当先行词既有人又有物时,用that .例如： The writer and his novel that you have just talked about are really well known . 你刚才谈起的那位作家以及他的小说确实很著名. 请注意: 以下几种只能使用which的情况: 1.引导非限制性定语从句，用which。 2.在“介词＋关系代词”结构中，关系代词必须用which。 如：The house in which we live is very large. 我们住的房子非常大。 This is the reference book of which the teacher is speaking. 这就是老师正在谈及的那本参考书。 注意：如果介词不放在修饰事物的限定性定语从句的句首，which就可换为that，例如：This is the question which/that we've had so much discussion about. =This is the question about which we've had so much discussion.
初中英语语法who which和that引导的定语从句 初中英语语法who, which和that引导的定语从句 【链接中考】 ( ) 1. Is that the man ______ helped us a lot after the earthquake? (2009浙江杭州) A. whose B. which C. when D. who ( ) 2. Sorry, we don’t have the c oat ______ you need. (2009河北) A. what B. who C. whom D. which ( ) 3. I’ve found some pictures of the most interesting places _______ you can visit during the winter holidays. (2009山东烟台) A. where B. which C. what D. that 【概念】在复合句中作定语的从句叫定语从句。 先行词：被定语从句修饰的名词或代词称为先行词。 关系词：引导定语从句的词叫关系词，也叫引导词。关系词包括关系代词和关系副词。关系代词有that, which, who, whom, whose等，关系副词有where, when, why等。 【关系代词的功能】 关系代词在从句中的功能 that 作主语或宾语(指人或物) which 作主语或宾语(指物，可与that互换) who 作主语或宾语(指人，可与that互换) 【温馨提示】 ◆that和which在从句中作宾语时常可省略。 ◆以下情况的定语从句常用that引导而不用which： (1) 先行词是不定代词all, few, little, much, everything, nothing, anything等时; (2) 先行词被形容词最高级修饰时; (3) 先行词被序数词修饰时; (4) 先行词被the very, the only, the last等修饰时; (5) 先行词被all, every, any, little, no等修饰时; (6) 先行词既有人又有物时。 ◆先行词在从句中作介词的宾语且介词前置时，只能用which或whom引导。 【语法闯关】用适当的关系代词填空。 1. I prefer shoes ______ are cool. 2. My necklace is not the only thing ________ is missing. 3. These are the best stamps _______ Kate has given me. 4. The building in ______ you live is comfortable. 5. —Is everything ______ we need to do done? —Yes. You needn’t worry about it. 6. The man ______ stands over there is my Chinese teacher. 7. I want to read all the books ______ were written by Guo Jingming. 8. The book ______ has a red cover is a storybook. Key： 【链接中考】1-3 DDD 【语法闯关】
定语从句中where和which的区别
定语从句中where和which的区别 1.This is the factory_________we visited yesterday. 2.This is the stable__________Jesus Chirst was born. 1,which 2.where 分析：关键是看从句中的动词。如果是及物动词（顾名思义，就是必须要接物做宾语的动词，或能用做被动的动词），则表明从句缺宾语，修饰人用who/whom/that。修饰物用that/which. 如动词是不及物（顾名思义就是不需要接物做宾语的或要接宾语时前面必须要加介词的，即用介宾的动词），则说明从句不缺宾语，可能是状语(或介宾）。表地点用where.时间用when. 如题1：从句的动词是visit，我们说参观某个地方说：visit some place。而不说visit in the place所以visit是及物动词。所以缺宾语，修饰物故用which. 如题2，我们说出生于某地用be born in，如：i was born in beijing 而不说i was born
beijing.故说明born 后不直接跟宾语，应用介宾，或关系副词（where/when)所以此处填in which 也是正确的。 所以在平时的练习中应注意动词的及物于不及物性1这是解决这类题的关键之一。扩展练习： 1.These are the days ____ I spent with my mom. (when） 2.These are the times _____ I experienced .（which） 英语定语从句that ,where ,which 的区别 例如：(1) I love places ____ the people are really fridendy A.that B.which C.where D.who (2) This is the place ____ I have ever visited there B.whom C.he D.which (3).This is the house ____ I want to buy A.In which B.that C.what D.that (4)this is the museum ____ we visited last year A.where B. in which C.which D.in that
定语从句中用Which的几种情况 Abstract :Generally, when talking about the differences between “that”and “which”in the Attributive Clauses, teachers like to emphasize the uses of “that”. So most students are familiar with them and know how to use “that”.But many of th e students don’t know the relative pronoun “which” also has many uses .In the past few years, “which”appeared more frequently in NMET than “that”.So in this article , the author mainly show us when to use “which” and give a complete conclusion of “which”. Key words: which 定语从句指代物指代人 通常，在讲定语从句关系代词“that”与“which”的区别时，老师喜欢强调“that”的用法，大部分学生对其比较熟悉，也知道如何使用“that”。然而，关系代词“which”的用法同样比较多。它既可以指物，也可以指人（这一点可能许多同学不太熟悉和了解）：既可以引导限制性定语从句，也可以引导非限制性定语从句。近几年来，高考对“which”的考查越来越多。请看下面几个高考题： 1 . The factory produces half a million pairs of shoes every year, 80%_______ are sold abroad . (2004年辽宁卷, 答案:A .which指代物) A. of which B. which of C. of them D. of that 2 . The journey around the world took the sailor nine months ,________ the sailing time was 226 days .(2004年广西卷,答案A . which 指代物) A. of which B. during which C. from which D. for which 3 . Frank’s dream was to have his own shop ______ to produce the workings of his owm hands. (2005年湖南卷答案：B which 指代物) A. that B. in which C. by which D. on which 4 . The English play _______my students acted at the New Year’s party was great success .(200 5 年全国I卷答案:C which指代物) A. for which B. at which C. in which D. on which 5 . Her sister has become a lawyer , _______ she wanted to be . ( 2005年湖北卷答案D which指代人) A. who B. that C. what D. which 因此，掌握“which”在何种情况下使用是非常有必要的。那么，“which”到底有那些用法呢？笔者在多年的教学实践中将“which”的用法进行了较全面的总结。现将其一些较特殊的和不常见的用法予以展示, 希望可对各位同仁和英语爱好者有所帮助。 一、先行词表物时下列情况只用which;不能用that： 1、在定语从句中,当关系代词紧跟介词,作介词宾语时 Eg：①.The table under which the boy crawled was put up for aution. 男孩在下面爬的那张桌子被拿去拍卖了。 ②.Light is the fast thing in the world , the speed of which is 300,000 kilometers per second. 世界上光的速度是最快的,其速度是每秒三十万公里。 ③.He once participated the investigation the result of which will be soon published. 他参加了结果不久就将公布的那项调查。 另外，还可以在不定式作定语的结构中作介词宾语。此时不定式短语相当于一个定语从句。 Eg : ①. The key with which to open the door has been lost. 开这扇门的钥匙不见了。
关系代词who引导定语从句作句子的主语、宾语。定语从句由关系代词who、whom、whose、which、what、as和关系副词where、when、why等引导。 who的用法 1.who引导的定语从句的先行词是表示人的名词或代词。例如： （1）The student who is answering the question is John. 正在回答问题的那个学生是约翰。 （2）Anybody who breaks the laws will be punished. 任何违反法律的人都将受到惩罚。 2.who是主格，在定语从句中作主语，此时不能省略。例如： （1）The person who was here yesterday is a musician. 昨天来这儿的那个人是位音乐家。 在非正式英语中，who亦可作宾语，且可以省略。例如： （2）The man（who）I saw just now is Mr Li.我刚才见到的那个人是李先生。 3.在定语从句中，who在人称、数上和其前面的先行词保持一致。如： Do you know the boy who is standing over there? 你认识站在那边的那个男孩吗？ 4.若先行词中既有人又有物，关系代词用that而不用who。例如： He watched the children and boxes that filled the car. 他看见了塞满汽车的孩子和箱子。
5.若先行词前面有形容词最高级、序数词修饰，关系代词用that而不用who。例如： （1）Yao Ming is the best basketball player that I know. 姚明是我知道的最好的篮球运动员。 （2）Tom is the first boy that left the room. 汤姆是第一个离开这个房间的男孩。
定语从句which 历年高考真题----定语从句which讲解，分为6部分；可作为专项练习用。 (1985)4. In fact the Swede did not understand the three questions__________ were asked in French. (A)where (B)who (C)in which (D)which 答案解析：从句部分缺主语，排除A,D； 从句代指的先行词为the three question, 所以排除B. (2004京春)23. Luckily, we’d brought a road map without __________ we would have lost our way. A. it B. that C. this D. which 答案解析：从句部分缺状语，排除A,C; 从句是介词+which的类型, 所以排除B. (2013山东) 31. Finally he reached a lonely island __________ was completely cut off from the outside world. A. when B. where C. which D. whom 答案解析：从句部分缺主语，排除A,B,D.
(2003北京）24．York, ___________last year, is a nice old city. A．that I visited B．which I visited C．where I visited D．in which I visited 答案解析：非限制性定语从句，排除A; 从句中，缺个宾语，排除C,D (2005湖北) 29．Her sister has become a lawyer, __________she wanted to be. A．who B．that C．what D．which 答案解析：从句部分缺表语，排除C; 从句为非限制性定语从句，排除B； 从句代指的先行词为a lawyer(此处为职业), 所以排除A. (1990）24.He paid the boy $ 10 for washing ten windows ,most of__________ hadn't been cleaned for at least a year. A.these B.those C.that D.which 答案解析：从句为非限制性定语从句，排除A,B,C； (1991）24. She heard a terrible noise, __________brought her heart into her mouth. A.it B.which C.this D.that 答案解析：从句为非限制性定语从句，排除A,C,D； (2005沪春）40.The United States is made up of fifty states, one of __________ is separated from the others by the Pacific Ocean. A. them B.those C. which D.whose 答案解析：从句为非限制性定语从句，排除A,B； 从句部分的主语one of (宾语fifty states)，排除D(whose作定语)，如whose book;
非限定性定语从句起补充说明作用，缺少也不会影响全句的理解，在非限定性定语从句的前面往往有逗号隔开，如若定语从句有限制性和非限制性两种。限制性定语从句是先行词不可缺少的部分，去掉它主句意思往往不明确；非限制性定语从句是先行词的附加说明，去掉了也不会影响主句的意思，它与主句之间通常用逗号分开，将非限定性定语从句放在句子中间，其前后都需要用逗号隔开。 which引导的非限制性定语从句。 关系代词which在非限制性定语从句中所指代和修饰的可以是主句中的名词、形容词、短语、其他从句或整个主句，在从句中作主语、动词宾语、介词宾语或表语。 ① which指代主句中的名词，被指代的名词包括表示物、婴儿或动物的名词、表示单数意义的集体名词以及表示职业、品格等的名词。 如：These apple trees，which I planted three years ago，have not borne any fruit. 这些苹果树是我三年前栽的，还没有结过果实。 She is an artist，which I am not. 她是一位艺术家，而我不是。 Water，which is a clear liquid，has many uses. 水是一种清澈的液体，有许多用途。 The two policemen were completely trusted，which in fact they were. 那两个警察完全受到信任，事实上，也真是如此。 ② which指代主句中的形容词。 如：She was very patient towards the children，which her husband seldom was. 她对孩子们很耐心，她丈夫却很少这样。 She is always careless，which we should not be. 她总是马虎大意，我们可不应该这样。
when，where，why引导的定语从句 when，where，why作为定语从句的引导词，总称为关系副词。下面用句子合并的方法分析它们的使用。 一、where引导的定语从句 请分析下面两个简单句： 句①I know a garden. 句②You can find wild strawberries there. 把句②变为句①的定语从句，句①中的agarden做定语从句的先行词。在句②中there指句①中提到的agarden也就是定语从句的先行词，there在句中做地点状语，因此要用where 引导定语从句，代替句②中的there，也就是说there就不能出现在定语从句中了。由此得到句③I know a garden where you can find wild strawberries. 句②还可以写作句④You can find wild strawberries in it(it指句①中的garden，“在花园中”要使用介词短语in the garden)。把句④变为句①的定语从句，因为it做介词in 的宾语，先行词是agarden，指物。在这种定语从句中介词常常提到定语从句的开始，这时关系代词只能使用which替代it，it就不能在定语从句中出现了。由此得到句⑤即：I know a garden in which you can find wild strawberries. 请把下面每组的两句话合并为一句，把第二句话变为第一句的定语从句。 第一组： This is the village. I was born there. →This is the village where I was born. 第二组： The lab is not far from here. The chemist often does experiments there. →The lab where the chemist often does experiments is not far from here.