高中语法定语从句讲解
as 引导的非限制性定语从句
It The earth is round._____ is known to all.
The earth is round,________ is known to all which/ as 在引导非限制性定语从句时可以指代一句话。
As _____ is known to all, the e末，而which It is known to all 引导定语从句不能 ______ that the earth is 放在句首.as译为正如，好像。， round. which 则没有此义。
as 引导的定语从句 (1)
Please compare:
This is the same pen as I lost. 这本书和我丢的那本一模一样。 This is the same pen that I lost.
as object
object (宾语) attribute （定语）
that/as which
who whom whose
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1. that 在从句中作主语或宾语，指人和物。 1) A plane is a machine that can fly. (主语) 2) The noodles that I cooked were delicious. (宾语) 3) Let’s ask the man that is reading the book over there. (主语) 4) The girl that we saw yesterday is Jim’s sister. (宾语)
Jack 穿红裤子的baby是Jack。
whose trousers are red The baby
the trousers of whom are red is of whom the trousers are red
Jack.
whose+n =the+n+of + which/whom
= of + which/whom+ the+n
定语的位置
单个词做定语前置 短语作定语一般后置 修饰some，any，no，every等词构成 的不定代词的定语都后置 定语从句一般放在所修饰名词的后面， 也可以分开
定语从句是 怎么来的呢？
Declan is a famous singer. He sings the song tell me why. Declan is a famous singer who sings the song tell me why.
(4)先行词被the only, the very, the same, the last修饰时。 This is the very book _____ belongs that
to him.
(5)先行词既有人又有物时。 The famous writer and his works _____ the (that) radio broadcast are popular to the students. (6) 先行词是who或which引导的主句。
He is a little boy. He is eating. He is a little boy who is eating.
He is a popular singer whose song is popular among young people. He is a famous singer who is from Taiwan.
2. Which 在从句中作主语或宾语，指物。 1) They planted the trees which didn’t need much water. (主语) 2) The fish which we bought were not fresh. (宾语) 在引导非限制性定于从句时，可以指代一 句话。 Michel Jackson suddenly died , which made his fans very sad.
关系词
定 语 从 句
The Restrictive Attributive Clause 限制性定语从句 （无逗号）
The Non-Restrictive Attributive Clause 非限制性定语从句 （有逗号）
When can they be left out？
定语从句关系代词：
指人 指物 subject (主语)
3、只用who的情况 who One ____ has nothing to fear dares to tell the truth. The ones ____ laugh at the disabled are not who good students. Anyone ____ fails to finish the task should who be punished. Those ____ want to go to The Great Wall who sigh up here.
定语从句中的几个概念
定语从句：是指在复合句中， 修饰名词或 代词的从句. 被定语从句所修饰的名词或代 词叫做“先行词 ”. 引导定语从句的词叫“关系词 ” 定语从句还叫做嵌入句，因形容 词定语，所以又称之为形容词性 从句。
e.g. This is the car which he bought last year. 先行词 定语从句
house caught fire last week. 2) This is the boy whose composition
the teacher talked of.
3) This is the book whose cover is blue.
难用的 whose
The teacher praised the student. His English is the best in our class. The teacher praised the student whose English is the best in our class. whose =the student’s
I’ve read all the books _____ you lend me. (that)
(3)先行词被序数词或最高级修饰时。 This is the first book _____ he has (that) read.
(that) It is the most beautiful city _____ I’ve ever seen.
This is the ring __________ she spent 1000 on which dollars.
(2) 在非限制性定语从句中。 which Football, ______ is a very popular game, is played all over the world.
一些重要的事情 something important 穿红衣服的女孩 a girl in red 一个站在树下的男孩 a boy standing under the tree 第一个来的小孩 the first child to come
Proverbs
谁笑到最后谁笑得最好。 He who laughs last laughs best. 结局好, 一切都好。 All is well that ends well.
真正的友谊犹如健康的身体, 失去时 方知其可贵。 Friendship is like health, the value of which is seldom known until it is lost.
定语是用来修饰、限定、说明名词或代词 的品质与特征的。主要有形容词此外还有 名词、代词、数词、介词短语、动词不定 式（短语）、分词、定语从句或相当于形 容词的词、短语或句子都可以作定语。汉 语中常用‘……的’表示。定语和中心语 之间是修饰和被修饰、限制和被限制的关 系。中心语与定语二者之间有的需要用结 构助词“的”，有的不需要，有的可要可 不要。 “的”是定语的标志。
先行词是one, ones, anyone, those时用who.
4 关系代词whose还可以在从句中
与它所修饰的词一起作介词宾语。 The boss in whose company my
father worked is a very kind person.
as 即可引导限制性定语从句也可以引导 非限制性定语从句。在定语从句中，即 可指人也可指物。引导限制性定语从句 时经常出现的结构有 the same ··as, such ··as, as ··as, · · · so ··as · Such people as have made great contributions to the world should be greatly respected. Let’s meet at the same place as we did yesterday.
关系词whose实际上是先行词的 所有格
难用的 whose
The house is mine. The window of the house is broken. The house whose window is broken
is mine. whose=the house’s window
Which baby is Jack?
Who is the girl _____ drove the car? that
2、只用which不用that的情况
(1) 关系代词在限制性定语从句中紧跟介词作宾语 （介词提前）。 under which There are many trees __________ they can have a rest.
高中英语语法定语从句总结全
高中英语定语从句详解Ⅰ、概念:(１) 定语从句:在主从复合句中用作定语得从句叫定语从句。
定语从句一般紧接在先行词（antｅcedｅｎt)后面。
(2) 先行词:被定语从句修饰得成份。
先行词可以为一个词,短语，或整个主句。
(3)引导定语从句得词叫关系词,分为关系代词与关系副词。
关系词得作用:1) 引导定语从句，连接主句与从句,相当于一个连词;２) 必在从句中作某个句子成份(可以做主语,宾语,表语,定语，状语)常用得关系代词: ｔhat、wｈｉcｈ、wｈo、whom、wｈosｅ,当关系代词在定语从句中做宾语时，关系代词可以省略。
常用得关系副词(在从句中只作状语): when(时间状语）、why(原因状语)、wｈe ｒｅ（地点状语）可以修饰人得关系代词:thａt, ｗho，wｈｏｍ,whosｅ可以修饰事得关系代词:tｈat, whｉcｈ, as，whose,The studeｎt who answerｅd ｔhe ｑuestion was John、Ｉkｎow thｅｒeasoｎwhy he wａｓso angｒy、The bｏy （wｈom) ｙou are taｌkｉnｇｔo is myｂrotｈｅｒ、Ｉ'd likｅ a ｒoｏｍwhose window fａｃesｔｈe sea、定语从句三步：第一找出先行词;第二瞧先行词在定语从句中得语法功能（做主语、宾语、表语或状语);第三选择合适得关系词。
Ⅱ、几个关系代词得基本用法:●tｈat:可指人或物；在定语从句中作主语,宾语,表语。
(指人时,相当于whｏ或wｈｏｍ;指物时,相当于whiｃh)（一般不用于非限制性定语从句；不可置于介词后作宾语) 如:1、A lｅtteｒthaｔ／which is wrｉtｔen in peｎcｉl is diffiｃult ｔo ｒead、（主语)2、Do yｏu kｎｏw tｈe gentleman ｔhａｔ/ｗｈｏspoke just ｎｏw?3、Ｙou can takｅａnything ( ｔhat)you like、(宾语)4、Whaｔｉs thｅquestiｏｎ(ｔhat/whｉｃh) they aｒｅｔalｋing about?5、Hｅreｉs theｍan （wｈo／whom/ｔhat) yｏu want tｏsee、6、Ｓhe＇s no longeｒthe girl( that) sｈeｕsｅd to ｂe befｏre、（表语）7、Ｏuｒhometｏwn iｓno ｌonger ｔhｅoｎe (thａt)it usｅｄto ｂe、(=Ｏｕr homeｔｏｗn iｓｎot tｈe sａｍe as it uｓed tｏｂe、= Our hｏmｅtｏwn is diffeｒenｔfrom what iｔｕｓｅｄtｏｂe。
定语从句高一知识点总结
定语从句高一知识点总结定语从句是高中英语中一个重要的语法知识点。
它能够为主句提供修饰成分，使得句子更加准确、丰富。
下面是对定语从句的高中英语知识点总结：一、定语从句的定义和作用定语从句是一个句子，用来修饰一个名词或代词。
它提供了更多的描述和信息，以使主句更加明确。
定语从句可以用来修饰人或物，而且在句子中可以作为主语、宾语、表语或定语。
二、定语从句的引导词1.关系代词：who, whom, whose, which, that2.关系副词：when, where, why三、定语从句的位置定语从句通常紧跟在所修饰的名词或代词之后。
四、关系代词的用法和例句1.用who或that代替修饰人的名词，作为定语从句的主语。
例句：The boy who is reading in the library is my brother.2.用whom或that代替修饰人的名词，作为定语从句的宾语。
例句：The girl whom you met yesterday is my best friend.3.用which或that代替修饰物的名词，作为定语从句的主语或宾语。
例句：The book which I borrowed from the library is very interesting.4.用whose表示所修饰名词的所有关系。
例句：The man whose car was stolen reported it to the police.五、关系副词的用法和例句1.用when表示时间，修饰修饰时间的名词，作为定语从句的状语。
例句：Yesterday was the day when we won the championship.2.用where表示地点，修饰修饰地点的名词，作为定语从句的状语。
例句：Do you remember the place where we had our first date?3.用why表示原因，修饰修饰原因的名词，作为定语从句的状语。
高中英语定语从句语法讲解(推荐)
高中英语定语从句语法讲解【概念】定语从句,也称为关系从句或形容词性从句,由关系代词或关系副词引导,用来限制,描绘或说明主句中的某一个名词或代词(有时也可以说明整个主句或主句中的一部分),即句子作定语.定语从句所修饰的对象被称为先行词.定语从句按其作用可分为限制性定语从句和非限制性定语从句.关系代词和关系副词的作用有:①连接作用:引导从句并同时连接主句和从句②替代作用:在从句中替代它前面的先行词③作成分:在从句中充当句子成分.如:主语(who,that,which);宾语(who,whom,which,that);表语(that,as);定语(whose,...of whom/which);时间状语(when),地点状语(where)和原因状语(why).说明:关系代词在从句中宾语时可省略,作其他成分时一般不可省略.(一)关系代词的用法1.关系词用法分类2.关系代词that和which的用法⑴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,none等时.Do you have anything that you want to say for yourself?You should hand in all that you have.②当先行词被the only,the very,any,few,little,no,all等词修饰时.This is the very person that I'm waiting for.The only thing that we can do is to give you some advice.③当先行词是形容词最高级或先行词的前面有形容词最高级修饰时.This is the best way that has been used against pollution.This is the most interesting film that I've ever seen.④当先行词是序数词或它前面有序数词修饰时.This train is the last that will go to Suzhou.What is the first American film that you have seen?⑤当先行词既有人又有物时.Do you know the things and persons that they are talking about?⑵当先行词指物时,定语从句中关系代词必须用which的情况:①在非限制性定语从句中,只用which,不用that.Helen was much kinder to her youngest son than to the others,which,of course,made the others envy him.②当定语从句中的介词提前时,只用which,不用that.This is the school in which I once studied.3.关系代词who/that,whom和whose的用法.当先行词指人: ①在定语从句中作主语时,用who/that,不可省略②在定语从句中作宾语时,用whom/who/that,可以省略③在定语从句中作定语时,用whose,不可省略She is the girl who/that lives next door.(先行词在定语从句中作主语)That's the girl(whom/who/that)I teach.(先行词在定语从句中作宾语)This is the scientist whose achievements are well known.(先行词在定语从句中作定语)This is the house whose window broke last night.=This is the house,the window of which broke last night.=This is the house,of which the window broke last night.4."介词+关系代词"引导的定语从句⑴当介词放在关系代词的前面时,关系代词常用which或whom,关系代词不能省略.Is this the house in which Shakespeare was born?He paid the boy ＄10 for washing ten windows,most of which hadn't been cleaned for at least a year. In the dark street,there wasn't a single person to whom she could turn for help.⑵在限制性定语从句中,当介词位于定语从句的末尾时,可用that/which(指物),that/whom/who(指人)作介词的宾语,而且作介词宾语的关系代词可以省略.thatThis is the hero who we are proud of.whom(可省略)thatThis is the pen which I wrote the letter with.(可省略)⑶"介词+which/whom+不定式"结构The beggar has no money with which to buy food.=The beggar has no money to buy food with.=The beggar has no money that he can buy food with.5.关系代词as引导的定语从句关系代词as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,as在从句中作主语,宾语或表语.as引导限制性定语从句时常用于下列句式:such+名词+as...像....一样的,像....之类的⑴the same+名词+as...和....一样的其中关系代词as在从句中担当主语,宾语或表语.We have found such materials as are used in their factory.(as作主语)These houses were sold at such a low price as people expected.(as作宾语)He is not the same man as he was.(as作表语)⑵...such as..such为代词,意为"这样的人或物",as引导定语从句并在从句中担当成分,定语从句修饰先行词such. This book is not such as I expect.(as作宾语)6.关系代词as与which引导非限制性定语从句时的区别as引导的非限制性定语从句,既可在主句前,又可在主句后,有时还可插入主句中,而which引导的非限制性定语从句只能置于主句之后.相同的是两者都可替代整个主句的内容.The weather turned out to be very good,which was more than we could expert.As is known to everybody,the moon travels round the earth once every month.=The moon travels round the earth once every month,as/which is known to everybody.(二)关系副词的用法1.当关系词在定语从句中作状语时,要用关系副词.其中when=表时间的介词(in,at,on,during)+which;where=表地点的介词(in,at,on,under)+which;why=表原因的介词(for)+which.I still remember the day when I first came to Beijing.(when=on which)Can you tell me the office where he works?(where=in which)Do you know the reason why he is absent?(why=for which)2.有时先行词为抽象名词situation,stage,point等,表示模糊化的地点,可用where引导定语从句. The accident has reached a point where both their parents are to be called in.(三)定语从句用法的其他要点1.定语从句中的谓语动词与先行词保持一致当引导定语从句的关系代词在从句中作主语时,定语从句中的谓语动词在人称,数方面应该与先行词保持一致.⑴one of+复数名词+关系代词+动词复数形式.Titanic is one of the most wonderful movies that have been produced in Hollywood.⑵the only one of+复数名词+关系代词+动词单数形式Titanic is the only one of these wonderful movies that has been produced in Hollywood.⑶当关系代词as与which引导非限制性定语从句,修饰主句内容时,若as与which作主语,则从句的谓语动词用单数形式.Great changes have taken place in China,as is known to all.2.注意way和time后接定语从句的情况⑴当先行词是way(意为"方式,方法"),定语从句中缺宾语时,引导定语从句的关系词有下列三种形式:thatThe way which he explained to us was quite simple.不填而当定语从句中缺状语时,引导定语从句的关系词有以下三种形式:。
高中数学定语从句语法讲义
高中数学定语从句语法讲义1. 什么是定语从句？定语从句是一个从句，在句中做修饰限制主句中名词或代词意义的作用。
它通常紧跟在被修饰的名词或代词之后。
2. 定语从句的构成定语从句由关系代词或关系副词引导，关系代词包括：that、which、who、whom、whose；关系副词包括：where、when、why。
3. 关系代词的使用3.1 that- 用来引导限制性定语从句，修饰人和事物。
- 既可以修饰名词，也可以修饰整个句子。
- 不能在定语从句中作主语。
- 可以用于修饰指示代词this、that、these、those。
3.2 which- 用来引导限制性定语从句，修饰事物。
- 不能引导修饰人的定语从句。
- 不能用于修饰指示代词this、that、these、those。
3.3 who/whom- 用来引导限制性定语从句，修饰人。
- who作主语，whom作宾语。
- 可以用于修饰指示代词this、that、these、those。
3.4 whose- 用来引导限制性定语从句，表示所属关系。
- 修饰名词或代词。
4. 关系副词的使用4.1 where- 用来引导限制性定语从句，修饰地点名词。
4.2 when- 用来引导限制性定语从句，修饰时间名词。
4.3 why- 用来引导限制性定语从句，修饰原因名词。
5. 定语从句的位置- 定语从句可以放在被修饰名词的前面或后面，取决于具体语境。
6. 例句1. The book that I borrowed from the library is very interesting.2. The house where they used to live is now for sale.5. This is the car whose owner is my neighbor.以上是关于高中数学定语从句的语法讲义。
定语从句在句子中起着修饰限制作用，通过使用不同的关系代词或关系副词来引导，对名词进行补充说明。
英语语法高中定语从句知识点归纳总结
英语语法高中定语从句知识点归纳总结定语从句是英语语法中的一个重要概念，它在句子中起到修饰名词或代词的作用。
在高中英语学习中，掌握定语从句的使用方法和规则对于提高语言表达能力和理解能力非常关键。
本文将对高中英语定语从句的知识点进行归纳总结。
一、定语从句的定义和作用定语从句是一个句子，它修饰一个名词或代词，用来给出更多的信息，进一步描述或限定该名词或代词的特定内容。
定语从句可以用来修饰人、事、物、地点等。
它在句子中的作用是为主句提供更多的信息，使句子更具体、更有表达力。
二、定语从句的引导词1.关系代词：定语从句中常用的关系代词有：- 人：who，whom，whose- 物：which，that，whose- 人或物：as，where，when2.关系副词：定语从句中常用的关系副词有：- 地点：where- 时间：when- 原因：why三、定语从句的基本结构定语从句的基本结构为：关系代词/副词 + 主句。
其中，关系代词或副词在定语从句中担任主语、宾语、表语或定语的作用。
四、定语从句的几个常见类型1.限制性定语从句：限制性定语从句用来对先行词进行进一步的限定，它的信息是先行词不可或缺的一部分。
限制性定语从句与主句之间没有逗号隔开，通常使用关系代词that，也可使用which或who。
例子:The book that you borrowed from me is very interesting.你从我这里借的那本书非常有趣。
2.非限制性定语从句：非限制性定语从句用来对先行词进行附加说明，它的信息只是对先行词的附加补充，可以省略而不影响句子的整体意思。
非限制性定语从句与主句之间用逗号隔开，通常使用关系代词which，也可使用who。
例子:The weather, which was sunny and warm, made our picnic very enjoyable.天气晴朗温暖，使得我们的野餐非常愉快。
高中定语从句语法讲解 优质课件
从句结构不完整，缺成分！用关系代词！
先行词+关系词+句子 定语从句的结构
关系代词
人：who whom that 物：which that xx的：whose
I like those books whose topics are about history.
先行词是物，关系代词作从句的定语， 译为“....的”,在这里是“书的（主题）”。
12. I’ll never forget the day _w_h_e_n_ she won the game.
Summary and Homework
listen to the music and find out all attributive clause:
#1 My Love -Westlife #2 Rhythm of the Rain - The Cascades #3 Valder Fields - Tamas Wells #4 All Too Well - Taylor Swift
I came to the city where you live.
①找出句中的先行词（时间/地点/原因），关系词和从句， ②判断从句结构是否完整。
I came to the city where you live. I will never forget the autumn when I met Tom. Tell me the reason why you like math!
This is the place that/whic（h we visited last time.）
从句缺少宾语，关系代词在从句中作宾语
This is the place where（we visited my grandparents last time.） 从句不缺少句子成分
高中英语语法复习——定语从句(共45张ppt)
2、先行词：被定语从句修饰的名词或 者代词叫做先行词。定语从句通常 置于它所修饰的成分之后。
eg: The boy who is playing basketball is my younger brother.
3、关系词：引导定语从句的关联词就叫关系 词。
A. 把从句和主句中被修饰的先行词连接在 一起．
2. I think the day will finally come______ air pollution can be put under control. A. that B. which C. when D. as
3. This is the store______ we visited the famous shop assistant. A. where B. there C. that D. which
结构分析： 系词所指代的先行词在句中作 know的宾语。
4. I don’t like the way _____ you speak to her. A. / B. that C. in which D. all A, B and C
特别注意!（5）
在实践中会遇到很多形似定语从句的句子，要 注意定语从句与其它从句的结构上的细微差别, 能够正确区分使用它们.
couldn’t be found.
A. that
B.where C. in which D. in that
The places couldn’t be found.可知关 系词所指代的先行词在句中作主语。
结构分析：
3. This is the reason ______ he has always been eager to know for these years. A. which B. why C. for which D. because He has always been eager to know the reason for these years.可知关
高中英语语法定语从句总结全
高中英语定语从句详解Ⅰ.概念:(1) 定语从句: 在主从复合句中用作定语的从句叫定语从句。
定语从句一般紧接在先行词()后面。
(2) 先行词：被定语从句修饰的成份。
先行词可以为一个词, 短语, 或整个主句。
(3) 引导定语从句的词叫关系词, 分为关系代词和关系副词。
关系词的作用:1) 引导定语从句, 连接主句和从句, 相当于一个连词；2) 必在从句中作某个句子成份（可以做主语, 宾语, 表语, 定语, 状语）常用的关系代词: 、、、、,当关系代词在定语从句中做宾语时, 关系代词可以省略。
常用的关系副词（在从句中只作状语）: （时间状语）、（原因状语）、（地点状语）可以修饰人的关系代词: , , ,可以修饰事的关系代词: , , , ,.I .() .I'd a .定语从句三步:第一找出先行词；第二看先行词在定语从句中的语法功能（做主语、宾语、表语或状语）；第三选择合适的关系词。
Ⅱ.几个关系代词的基本用法:●: 可指人或物；在定语从句中作主语, 宾语, 表语。
(指人时, 相当于或；指物时, 相当于)(一般不用于非限制性定语从句; 不可置于介词后作宾语) 如:1.A .(主语)2.3. ( ) .（宾语）4. ()5. ( ) .6.'s ( ) .（表语）7. () .（= .= 。
= .）●: 指物；在定语从句中作主语, 宾语。
如:1. .（主语）2. () I .（宾语）●, , :: 主格, 在从句中作主语, 只可指人: 宾格, 在从句中只能作宾语; 只可指人: 表所属关系, 在从句中作定语。
译为: 某人的, 某物的+ 名词 + n.+ (某物的)+ n.+ (某人的)I .（主语）( / ) .I a .( = )A .（指人）( = )I'd a .（指物）( )关系代词作介词宾语 (在定语从句中, 介词提前时, 介词后: 表人用；表物用 )关系代词在定语从句中用作介词宾语时, 介词可放于从句之首, 也可放于从句之末.但以放于句首较为正式.（介词前置，必须注意不影响动词词组的含义。
高中英语语法讲解定语从句课件(共53张PPT)
关系代词的实质
Join the following sentences:
The girl is Mary. We saw her yesterday.
The girl her we saw
yesterday is Mary.
关系代词的实质
Join the following sentences:
1.that 与which
1.This is the best TV _______ that is made in China. that he 2.The first museum _______ visited in China was the History Museum.
先行词被形容词最高级 或序数词修饰时，引导 定语从句多用that 。
引导定语从句用that .
1.that 与which 1.Who that _______ you have ever
know can do it better ?
Who做先行词时， 引导定语从句用 that
1.that 与which
1.Her bag, in ________ which she put all her money, has been stolen. which she 2.This is the ring on ________ spent 1000 dollars. 3.Xiao Wang , with ________ I went whom to the concert, enjoy it very mue is such a lazy man_____ nobody wants to work with______. A. as; him B. that; / C. as; / D. whom; him 2. Mrs. Black took the police back to____ place ____ she witnessed the robbery. A. the same; as B. the same; where C. the same ; that D. as the same; as
高中英语定语从句总结
高中英语定语从句总结高中英语定语从句总结定语从句是修饰名词或代词的从句，用来对被修饰词进行进一步的说明或限定。
在高中英语中，定语从句是一个非常重要的语法知识点，掌握定语从句的使用方法对于正确理解和使用英语具有重要的作用。
下面是关于高中英语定语从句的总结。
一、定语从句的引导词定语从句通常由关系代词和关系副词引导。
常用的关系代词有：that, which, who, whom, whose, as等；常用的关系副词有：when, where, why。
1. 关系代词：(a) that 用来修饰人或物，常可省略；用来引导非限制性定语从句时，前面要加逗号。
(b) which 用来修饰物，常可省略；用来引导非限制性定语从句时，前面要加逗号。
(c) who 用来修饰人，不可省略；用来引导非限制性定语从句时，前面要加逗号。
(d) whom 用来修饰人，作宾语时不可省略；用来引导非限制性定语从句时，前面要加逗号。
(e) whose 用来修饰人或物，不可省略；用来引导非限制性定语从句时，前面要加逗号。
(f) as 用来修饰人或物，引导非限制性定语从句时使用，相当于which。
2. 关系副词：(a) when 引导时间定语从句，相当于“at/in/on which”。
(b) where 引导地点定语从句，相当于“in/at/to which”。
(c) why 引导原因定语从句，相当于“for which”。
二、定语从句的种类定语从句分为限制性定语从句和非限制性定语从句。
1. 限制性定语从句是对被修饰词起限定作用的从句，如果去掉定语从句，主句的意思会不完整或不明确。
限制性定语从句使用关系代词that, which, who等引导。
关系代词在定语从句中可以作为主语、宾语、表语或定语。
例句：This is the book that I bought yesterday.这是我昨天买的书。
2. 非限制性定语从句则是对被修饰词进行进一步补充说明，如果去掉定语从句，主句的意思仍然是完整的。