高一英语语法难点--定语从句
高一英语语法归纳--定语从句
定语从句一．几个基本概念1.定语从句的定义：用作定语的从句叫定语从句。
2.先行词：被定语从句所修饰的名词或代词。
3.定语从句的位置：紧跟先行词（名词或代词）之后。
4.引导词：引导定语从句的词（包括关系代词和关系副词）。
﹙1﹚关系代词：that/who/whom/which/as﹙2﹚关系副词：when/where/why5.引导词的位置：位于定语从句之前（先行词之后）。
【as除外】6.引导词的功能（作用）：﹙1﹚连接先行词和定语从句。
﹙2﹚在定语从句中充当一定的成分（关系代词充当主语或宾语，关系副词充当状语）。
7.定语从句的类型：﹙1﹚限定性定语从句（主句和定语从句之间无逗号）。
①直接由引导词引导定语从句The man who you’re talking to is my friend.②由介词+关系代词（whom/which）引导The man to whom you’re talking is my friend.I need a pen with which I can write a letter.=I need a piece of paper on which I can write a letter.介词的选用可根据从句中的相关词组确定，该介词通常可以放在关系代词之前，也可放在从句之尾。
例如：The man (who/whom/that) I talked about at the meeting is from Beijing University.=The man about whom I talked at the meeting is from Beijing University.The palace (which/that) I often pay a visit to was built in the 17th century.=The palace to which I often pay a visit was built in the 17th century.﹙2﹚非限定性定语从句（主句和定语从句之间用逗号隔开）。
高一英语重点语法英语笔记--定语从句
高一英语重点语法英语笔记--定语从句高一英语重点语法英语笔记--定语从句定语从句是高中英语第一大语法内容，必需清楚把握。
接下来我为大家整理了高一英语学习的内容，一起来看看吧!高一英语重点语法--定语从句01定语从句基本概念在复合句中，修饰名词或代词的从句叫定语从句。
引导定语从句的词叫关系词。
被修饰的名词或代词叫先行词。
定语从句一般放在先行词的后面。
02定语从句的关系词引导定语从句的关系词有关系代词和关系副词。
常见的关系代词包括that， which， who(宾格whom，全部格whose)，as 等。
关系副词包括where， when， why等。
关系代词和关系副词放在先行词及定语从句之间起连接作用，同时又作定语从句的重要成分。
03定语从句的分类依据定语从句与先行词的关系，定语从句可分为限制性定语从句及非限制性定语从句。
1. 限制性定语从句紧跟先行词，主句与从句不用逗号分开，从句不行省去。
例如：Any man that / who has a sense of duty wont do such a thing.任何有责任感的人都不会做这样的事。
2. 非限制性定语从句主句与从句之间有逗号分开，起补充说明作用，如省去，意思仍完整。
例如：The house,which we bought last month,is very nice.这幢房子很美丽,是我们上个月买的.留意：非限定性定语从句中不能使用关系代词 that。
04关系代词的用法1. thatthat既可以用于指人，也可以用于指物。
在定语从句中作主语、宾语或表语，作宾语可省略。
例如：Mary likes music that is quiet and gentle.玛丽喜爱轻柔的音乐。
(that作主语)The coat (that) I put on the desk is blue.我放在桌子上的那件外套是蓝色的。
(that作宾语)2. whichwhich 用于指物，在句中作主语、宾语或表语，作宾语可省略。
高中英语2025届高考语法难点非限制性定语从句知识讲解
高考英语语法难点非限制性定语从句一、非限制性定语从句1.非限制性定语从句的构成非限制性定语从句对先行词进行补充说明，去掉不会影响主句的意思，通常用逗号与主句隔开。
先行词可以是主句中的某个名词或名词词组，也可以是主句中的谓语部分，或者是整个主句。
如：My grandmother,who is over eighty years old, still does housework on her own.(先行词为My grandmother)The plane was delayed,which made the passages very angry.(先行词为整个主句The plane was delayed)He sang us a folk song,which he had learned during his stay in the countryside.(先行词为a folk song)Mrs.Zhang is extremely popular amongstudents, as is common knowledge.(先行词为整个主句，从句对主句内容进行评述)2.非限制性定语从句的关系词非限制性定语从句由关系代词which、who、whom、whose或关系副词when、where等引导。
1) who、which引导非限制性定语从句并在从句中作主语。
如：Bob lent me a thousand dollars,which was exactly the amount I need.鲍勃借给我一千美元，正好是我所需要的数目。
The children,who wanted to play football, were disappointed when it rained.想踢足球的孩子们因下雨而感到失望。
The computer,which seems to play the role of a human brain, is often called an electronic brain．计算机似乎起着人脑的作用，所以常被称为电脑。
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。
高一英语语法-定语从句
定语从句--Attributive Clauses1．定语从句：在复合句中起起形容词的作用,用来修饰名词、名词性成分或代词的从句，所以又称为形容词性从句。
相关概念：先行词——定语从句中所修饰的名词、名词性成分或代词叫做先行词。
关系词（引导词）——引导一个定语从句的词。
Eg: She is an English teacher (who likes singing songs).I still remember the day when I first came to Beijing.2.关系词(引导词)：引导定语从句的关联词称为关系词，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where, when, why等。
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。
关系词先行词所指关系词在句中作用that人/物主、宾(可省) 、表关系代词which物主、宾(可省)who人主、宾(可省)whom人宾Whose/of which人/物定as人/物/事情主、宾、表when时间时间状语关系副词where地点地点状语why原因原因状语关系词常有3个作用：1，引导定语从句。
2，代替先行词。
3，在定语从句中担当一个成分。
3.定语：定语用来限定、修饰名词或代词的，是对名词或代词起修饰、限定作用的词、短语或句子，汉语中常用‘……的’表示。
主要由形容词担任。
此外，名词，代词，数词，分词，副词，不定式以及介词短语也可以来担任，也可以由一个句子来担任．单词作定语时通常放在它所修饰的词之前，作前置定语。
短语和从句作定语时则放在所修饰的词之后，作后置定语。
4. 定语从句有限制性和非限制性两种1)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，例如：This is the house which we bought last month. 这是我们上个月买的那幢房子。
高中英语语法重点难点回顾：定语从句
高中英语语法重点难点回顾――定语从句用来说明主句中某一名词或代词(有时也可说明整个主句或主句中一部分而起定语作用的句子叫作定语从句。
一.词引导的定语从句1. 关系代词用来指代先行词是人或物的名词或代词句子成分用于限制从句或非限制性从句只用于限制性从句代替人代替物代替人或物主语Who which that主语Whom which that宾语Whose(=of whom whose(=of which例1:This is the detective who came from London.例2:The book which I am reading is written by Tomas Hardy.例3:The desk whose leg is broken is very old.例4:This is the room that Shakespeare was born in.2.关系代词的用法(1 如果先行词是all, much, anything, something, nothing, everything, little, none 等不定代词,关系代词一般只用that,不用which。
例如:All the people that are present burst into tears.(2 如果先等词被形容词最高级以及first, last, any, only, few, mush, no, some, very等词修饰,关系代词常用that,不用which, who,或whom。
例如:(3 非限制性定语从句中,不能用关系代词that,作宾语用的关系代词也不能省略。
例如: There are about seven million people taking part in the election, most of whom、are well educated. (4 which还有一种特殊用法,它可以引导从句修饰前面的整个主句,代替主句所表示的整体概念或部分概念。
高考重难点语法-定语从句的经典归纳
定语从句1.定语从句基本概念定语从句：在复合句中，修饰名词或代词的从句叫定语从句。
关系词：引导定语从句的词叫关系词。
先行词：被修饰的名词或代词叫先行词。
定语从句一般放在先行词的后面。
2.定语从句的关系词引导定语从句的关系词有关系代词和关系副词。
常见的关系代词包括that，which，who（宾格whom，所有格whose），as 等。
关系副词包括where，when，why等。
关系代词和关系副词放在先行词及定语从句之间起连接作用，同时又作定语从句的重要成分。
7.注意事项：2. 定语从句中的主谓一致①定语从句中的谓语动词由先行词决定。
例如：I, who am your good friend, will try my best to help you.②当“one of +复数名词”后接定语从句时，从句中的谓语动词和复数名词一致，用复数；而“the only one of +复数名词”后接定语从句时，从句中的谓语动词和the only one一致，用单数。
例如：Susan is one of the students who have won the prize three times.Susan is the only one of the students who has won the prize three times.3. 定语从句中的插入语现象定语从句中的关系词后面有时会加入一些句子作插入语，如I think, I believe, I expect, I guess, I am sure等。
解题时，去掉插入语，会使句子简单化。
例如：Mr Lee made another discovery, which (I think) is very important.4. 通常只用that，不用which, who或whom的情况：①当先行词为all, everything, nothing, anything, little, few, much, none等不定代词时。
高三英语一轮复习语法专题---定语从句知识点梳理与题库
定语从句知识点梳理1.定语从句：定语从句是由关系代词或关系副词引导的从句，其作用是作定语修饰主句的某个名词性成分，相当于形容词，所以又称为形容词性从句，一般紧跟在它所修饰的先行词后面。
2.关系词：引导定语从句的关联词称为关系词，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where, when, why等。
关系词常有3个作用：1.引导定语从句2.代替先行词3.在定语从句中担当一个成分。
3. 先行词：被定语从句修饰的名词、代词称为先行词。
一、关系词的用法(一)关系代词who, whom, whose, that, which（在句中作主语、宾语或定语）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，在从句中所起作用如下：Is he the man who/that wants to see you?他就是你想见的人吗？（who/that在从句中作主语）He is the man whom/ that I saw yesterday.他就是我昨天见的那个人。
（whom/that在从句中作宾语）2) Whose 用来指人或物，(只用作定语, 若指物，它还可以同of which互换）, 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它们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 come unwrapped.4) asAs用于先行词前有as, so, such, the same修饰的限制性定语从句.You can take as many books as you need.(二) 关系副词when, where, why（在句中作状语）1. when指时间，在定语从句中做时间状语(1) I still remember the day when I first came to the school.(2) The time when we got together finally came.2. where指地点，在定语从句中做地点状语(1) Shanghai is the city where I was born.(2) The house where I lived ten years ago has been pulled down.3. why指原因，在定语从句中做原因状语(1) Please tell me the reason why you missed the plane.(2) I don’t know the reason why he looks unhappy today.注意：关系副词引导的从句可以由“介词+关系代词”引导的从句替换(1) The reason why/ for which he refused the invitation is not clear,(2) From the year when/in which he was going to school he began to know what he wanted when hegrew up.注意：介词+关系代词引导的定语从句关系代词在定语从句中做介词宾语时1. 含有介词的动词短语一般不拆开使用，如：look for, look after, take care of等(1) This is the watch which/that I am looking for. (T)(2) This is the watch for which I am looking. (F)2. 若介词放在关系代词前，关系代词指人时用whom，不可用who或者that；指物时用which，不能用that；关系代词是所有格时用whose(1) The man with whom you talked is my friend. (T)(2) The man with that you talked is my friend. (F)3. “介词+关系代词”前可有some, any, none, both, all, neither, most, each, few等代词或者数词(1) He loved his parents deeply, both of whom are very kind to him.(2) In the basket there are quite many apples, some of which have gone bad.4. 介词后面的关系词不能省略。
高考英语语法定语从句考点突破
高考英语语法定语从句考点突破一、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。
1.I told him all (that) I know.2.He gave her everything (that) he had.2.先行词被all, every, any, the very, the only, the just等修饰时。
1.I have read all the books (that) you gave me.2.You 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。
高一英语必修一定语从句总结
定语从句一、三个概念1.定语从句：2.先行词：3.关系词：例：The boy who is singing at the stage is only nine years old.先行词关系词定语从句Anyone that is willing to help others is welcome to our group.先行词定语从句关系词二、关系词的用法关系代词: who/whom/that/which/whosewhose：表所有格，先行词既可以是人，也可以是物The worker whose arm was broken was sent to hospital.The river whose banks are covered with trees is very long.关系副词：when/where/why1. when: 指时间，其先行词表示时间，在句中作时间状语。
例：This was the time when he arrived.I will never forget the day when I met my favorite star.2. where指地点，其先行词表示地点，在句中作地点状语。
例：This is the factory where he works.Nanjing is the place where I was born.3. why 指原因，其先行词是原因，起原因状语作用。
例：Nobody knows the reason why he is often late for school.Is this the reason why he refused our offer?注意：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。
例：I will never forget the day on which I met my favorite star.【when】Nanjing is the place in which I was born.【where】Is this the reason for whic h he refused our offer?【why】四、关系代词that的特殊用法只用that 的情况1.先行词被序数词或形容词最高级所修饰，或本身是序数词、基数词、形容词最高级时，只能用that，而不用which.例如：He was the first person that passed the exam.2.被修饰的先行词为all, any, much, many, everything, anything， none， the one等不定代词时，只能用that，而不用which.例如：Is there anything that you want to buy in the shop？3.先行词被the only， the very， the same， the last， little， few 等词修饰时，只能用that，而不用which.例如：This is the same bike that I lost.4.先行词里同时含有人或物时，只能用that，而不用which.例如：I can remember well the persons and some pictures that I saw in the room.5..以who或which引导的特殊疑问句，为避免重复，只能用that.例如：Who is the girl that is crying？6.主句是there be 结构，修饰主语的定语从句用that，而不用which.例如：There is a book on the desk that belongs to Tom.7.先行词在主句和从句中都作表语时，只能用that.例如：He is not the man that he once was.8.先行词是the way时，只用that不用that 的情况1.先行词为that, those时，用which，而不用that.例如：What’s that which is under the desk？2.关系代词前有介词时，一般用which，而不用that.例如：This is the room in which he lives. 这是他居住的房间。
定语从句-高一英语语法专题
高一英语语法专题定语从句一、概念1.定语从句：定语从句是由关系代词或关系副词引导的从句，其作用是作定语修饰主句的某个名词性成分，相当于形容词，一般紧跟在它所修饰的先行词后面。
2.关系词：引导定语从句的关联词称为关系词，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where, when, why等。
关系词常有3个作用：1引导定语从句、2代替先行词、3在定语从句中担当一个成分。
注：关系代词有主语、宾语之分。
一般whom作为宾语。
3.先行词：被定语从句修饰的名词、代词称为先行词。
二、限制性定语从句和非限制性定语从句（一）限定性定语从句（没有逗号）（1）关系代词（在句中作主语、宾语或定语）1. that既可代表事物也可代表人which代表事物。
注：that和which在从句中作宾语时常可省略。
e.g. The number of the people that come to visit the city each year rises one million.e.g. Football is a game which is liked by most boys.2.代表物时多用which，但在带有下列词的句子中用that而不用which：当先行词是anything, everything, nothing , none等不定代词时，或者是every, any, all, some, no, little, few, much等修饰时等，或者是有序数词或形容词最高级修饰时、既有人又有物时、句中前面有which时都只能用that。
3. who和whom引导的从句用来修饰人，who作从句中的主语,whom作宾语e.g. The boys who are playing football are from Class One.e.g. Mr. Ling is just the boy whom I want to see.e.g. The man who/whom you met just now is my friend.4. whose是关系代词，修饰名词作定语，相当于所修饰成分的前置所有格。
定语从句是高中英语三大类从句中最难的一类其难点主要在
定语从句是高中英语三大类从句中最难的一类，其难点主要在于很多学生在学习时分不清先行词，不能正确使用关系代词、关系副词。
因此在学习定语从句时，务必搞清定语从句的概念、关系词的正确选择和使用情况等。
2018年高考定语从句的考查还将是对关系代词和关系副词的考查。
对定语从句的考查仍将不会单纯考查其语法结构，而是将其融入一定的语境中来考查考生的实际综合运用能力。
定语从句是高考的热点，对于定语从句考纲要求掌握以下内容：1.引导限制性定语从句的关系词；2.引导非限制性定语从句的关系词；3.限制性与非限制性定语从句的区别；4.介词+关系代词的用法；5.不定代词/数词+of which/whom引导的非限制性定语从句及其该结构与并列句的判断；6.关系词之间的异同现象及选用。
考点1：关系代词一览表关系词先行词从句成分例句备注关系代词who人主语Do you know the man who is talkingwith your mother?whom, which和that在从句中做宾语时，常可以省略，但介词提前时后面关系代词不能省略，也不可以用that whom 人宾语Mr. Smith is the person with whom I amworkingThe boy (whom) she loved died in thewar.whose 人，物定语I like those books whose topics are abouthistory.The boy whose father works abroad ismy desk mate.that 人，物主语宾语A plane is a machine that can fly.She is the pop star (that) I want to seevery much.考向预测考点定位which 物主语宾语The book (which) I gave you was worth$10.The picture which was about theaccident was terrible.as 人，物主语宾语He is such a person as is respected by allof us.This is the same pen as I lost yesterday.as做宾语一般不省略关系副词when 时间时间状语I will never forget the day when we metthere.可用onwhich where 地点地点状语This is the house where I was born. 可用in which why 原因原因状语I can’t imagine the reason why he turneddown my offer.可用forwhich【典例】In 1963 the UN set up the World Food Programme, one of ________ purposes is to relieve worldwide starvation.A. whichB. itsC. whoseD. whom【答案】C【解析】考查定语从句。
高一英语定语从句归纳整理
高一英语定语从句归纳整理一、定语从句的定义定语从句是修饰名词或代词的从句，通常放在所修饰的名词或代词之后，被称作后置定语。
定语从句主要分为限定性定语从句和非限定性定语从句两种类型。
二、关系代词的种类及用法关系代词在定语从句中用作宾语或主语，起到指代先行词的作用。
常见的关系代词有that、which、who、whom和whose。
1.That：用于修饰人或物，指代某个特定的事物。
在从句中，that可作主语或宾语。
2.Which：也用于修饰人或物，指代某个特定的事物。
在从句中，which通常作主语或宾语。
3.Who：用于修饰人，指代某个人的身份或特征。
在从句中，who通常作主语。
4.Whom：用于修饰人，指代某个人的身份或特征。
在从句中，whom通常作宾语。
5.whose：用于修饰人或物，指代某个事物的归属或特征。
在从句中，whose通常作定语。
三、关系副词的种类及用法关系副词在定语从句中用作状语，起到修饰整个从句的作用。
常见的关系副词有when、where和why。
1.When：用于修饰时间，指代某个特定的时间点或时间段。
在从句中，when可作时间状语。
2.Where：用于修饰地点，指代某个特定的地点或场所。
在从句中，where可作地点状语。
3.Why：用于修饰原因，指代某个特定的情况或事实。
在从句中，why可作原因状语。
四、限定性定语从句和非限定性定语从句的区别1.限定性定语从句：限定性定语从句与主句的关系十分紧密，缺之不可，对先行词起限定、修饰的作用。
如果将其去掉，会影响句子完整性，甚至意义不明。
限定性定语从句的先行词前面不可加其他定语修饰词，并且不用逗号隔开。
2.非限定性定语从句：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，它与主句之间通常用逗号隔开。
非限定性定语从句前面可以加其他定语修饰词。
非限定性定语从句先行词为专有名词或者具有特指性的名词时，一般不用that。
非限定性定语从句还可以由as引导。
高一定语从句的知识点英语
高一定语从句的知识点英语定语从句是英语语法中的一个重要部分，它在句子中担任修饰名词或代词的功能。
通过使用定语从句，我们可以更加准确地表达我们的意思，增加句子的信息量，并使语言更加丰富多样。
在高中英语学习中，定语从句是必不可少的一部分，因此我们需要对其知识点进行深入学习和理解。
首先，我们来看一下定语从句的构成。
定语从句通常由关系代词或关系副词引导，并且与主句通过先行词相连接。
关系代词包括that, which, who, whom, whose等等，而关系副词则包括when, where, why等等。
关系代词在定语从句中除了作为主语和宾语的功能外，还可以作为介词的宾语。
举个例子来说明这个概念。
假设我们有一个句子“Tom is the student. I interviewed him yesterday.”我们可以将其合并为一个定语从句来改写：“Tom is the student whom I interviewed yesterday.”在这个例子中，先行词是student，关系代词whom在从句中作为宾语，并与主句中的I interviewed相连接。
接下来，让我们来看一下定语从句的分类。
定语从句可以分为限制性定语从句和非限制性定语从句。
限制性定语从句提供了对先行词的必要限制，去除定语从句将导致句子的意义不完整或产生歧义。
非限制性定语从句提供了对先行词的额外信息，去除定语从句不会改变句子的主要意义。
举个例子来说明这个分类。
假设我们有一个句子“John, who is my best friend, is coming to visit me.”这个句子中的定语从句“who is my best friend”是非限制性定语从句，因为即使去除了定语从句，主句“John is coming to visit me.”的意义仍然完整。
而如果我们将句子改为“The boy who is wearing a red hat is my brother.”这个句子中的定语从句“who is wearing a red hat”是限制性定语从句，因为去除了定语从句，主句“The boy is my brother.”的意义就变得不完整了。
突破高一语法之一---定语从句
定语从句一、【基础知识】学习who/whom/whose/which/that 引导的定于从句，理解并熟悉其结构。
1)先行词和关系词主句中被定语从句修饰的词叫做先行词，定语从句一般位于先行词之后。
关系词有关系代词和关系副词，用来指代先行词。
关系代词有that/which/who/whom（宾格）/whose（所有格）/as,关系副词有when/where/why2）关系代词的用法*who 指人，是主格，在定语从句中作主语或宾语都可以。
e.g. The girl who is singing is John’s sister. 正在唱歌的女孩是约瀚的姐姐。
（girl是先行词，关系代词who在从句作主语。
在这种情况下也可用that）注：关系代词在定语从句作主语时，其人称和数要与先行词一致。
*whom指人，是宾格，在定语从句只作宾语。
e.g. The man (whom)we talked about will come tomorrow. 我们谈论的那个人明天来。
（先行词是man，关系代词whom在从句作talk about的宾语，在英语口语中可以省略。
在这种情况下也可以用who或that，它们都能指代人，作主语或宾语都可以）*whose多指人，也可指物，指物时。
在指物时可与of which换用，whose是所有格, 在定语从句中作定语。
e.g. Aunt Wang is looking after the little child whose parents have gone to Shanghai.王姨在照看父母都去了上海的那个小孩。
(先行词是the little child, 关系代词whose在定语从句作parents的定语)He lives in the room whose windows ( the windows of which) face south.他住在窗户朝南的那个房子里(the room是先行词, 关系代词whose在定语从句作windows的定语)* that: 指人或物，在定语从句中担任主语或宾语。
高一级英语定语从句讲解
高一级英语定语从句讲解一、定语从句1．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、宾语或状语）；第三选择合适的关联词。
2．定语从句在选择关联词that 与which时，常常容易出错，所以应记住什么时候只能用that，什么时候只能用which.（1）．只能用that 的情况归纳4种：即先得词被序数词最高级修饰过；先行词为all 、everything、nothing等不定代词；先行词同时是人和物并列时；最后先行词分别被the only 、the very the same、the last 修饰。
请看下列四组例句，注意其先行词：①．The first thing that we should do is to work out a plan .②．I t almost seemed as if the good man were trying to teach us all that he knew at this lesson .③．Later my father and Mr. Crosset talked for about half an four of things and persons that they remembered in school.④．This is the very dictionary that I want to find .（2）．只用which is 情况有两种情况：一是非限制性定语从句，关联词要用which；二是做介词宾语时只能用which。
请看下列两组例句：I said nothing , which made him more angry .I have the book about which you are talking .三、在定语从句的非限制性定语中，which 和as 是容易混淆的。
在很多情况下两者兼可互换，但在下列情况中不可互换：1、通常As 可以放在整句的句首，而which，只能在逗号之后，as 本身含有“正如”，as 在定语从句中既可是主语也可做宾语As appear from her paper ,she has read widely in Romantic literature.She is remarkable, as I have told you .2、which 在做非限制性定语从句关联词时可以无明确先行词，指前句整个的意思，如：She has married again, which surprises us .四、在定语从句中，许多人往往分不清all that 和what, what 实际上只引导名词性从句，它相当于all that两个字，例如：All that I know is that he has made up his mind to heave the country for a new place.= what I know is that ……定语从句知识要点：一、限定性定语从句：注：先行词是time, minute, moment, next tim 很少用关系副词when,可用that 但通常省去。
高中英语最难语法
一、定语从句（Adjective Clause）定语从句是在一个句子中修饰名词或代词的从句。
它通常由关系代词或关系副词引导，用来修饰前面的名词或代词，并且在句子中充当定语的角色。
定语从句是英语语法中最具挑战性的一部分之一，也是高中英语中常出现的难点之一。
定语从句的引导词主要有关系代词who, whom, whose, which和关系副词when, where, why。
在选择合适的引导词时，我们需要根据先行词的不同特点来决定。
1. 关系代词who/whom关系代词who用于指人作主语，whom用于指人作宾语。
例如：- The girl who is standing over there is my best friend.（那个站在那边的女孩是我最好的朋友。
）- The man whom you met yesterday is my brother.（你昨天见到的那个男人是我兄弟。
）2. 关系代词whose关系代词whose用于指人或物，表示所属关系。
例如：- The book whose cover is red belongs to me.（那本封面红色的书是我的。
）- The boy whose sister is a doctor is very smart.（那个姐姐是医生的男孩非常聪明。
）3. 关系代词which关系代词which用于指物作主语或宾语，常用于修饰句子中的非限定性从句。
例如：- I have a dog which is very cute.（我有一只非常可爱的狗。
）- The car which I bought last month is very expensive.（我上个月买的那辆车很贵。
）4. 关系副词when, where, why关系副词when用于指时间，where用于指地点，why用于指原因。
例如：- That was the day when we had a great party.（那一天是我们举办盛大派对的日子。
【高中英语】高中英语定语从句难点总结讲解
【高中英语】高中英语定语从句难点总结讲解【编者按】该句的意思是“学生们通常是在大厅开会”，单独看这一句，无论是其意思还是其语法均没错，但若将其与上文联系起来看、、、具体内容请进入大学频道高中英语定语从句难点总结讲解（1）一、强调句型与定语从句1. “Where did you find the professor who made the speech yesterday?” “It was in the hall ______ the students often have a meeting.”A. whereB. whichC. thatD. when【分析】假若选C，即有 It was in the hall that the students often have a meeting，该句的意思是“学生们通常是在大厅开会”，单独看这一句，无论是其意思还是其语法均没错，但若将其与上文联系起来看，则不通，因为上文的意思是“你是在哪儿找到昨天作报告的那位教授的?”假若将答句改为 It was in the hall that I found the professor，则完全可以。
其实，此题的最佳答案是A，where the students often have a meeting 为定语从句，用以修饰其前的名词 the hall，句意为“是在学生们经常开会的那个大厅(找到教授的)”，这样语意就通顺了2.It was in the small house ______ was built with stones by his father______ he spent his childhood.A. which, thatB. that, whichC. which, whichD. that, where【分析】答案选A，第一空填 which，用以引导定语从句;第二空填that，为强调句的结构词，被强调部分为 in the small house (以及修饰它的定语从句 which was built with stones by his father)。
高一英语语法重难点讲解
高一英语语法重难点讲解—高一英语必备定语从句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。
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定语从句定语从句：defining and non-defining 限制性和非限制性定语从句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(antecedent)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: that、which、who、whom、whose、as 、but (文语, 置于否定词之后=that/who…not…, "没有……不……", 在从句中作主语，宾语)常用的关系副词（在从句中只作状语）: when、why、whereThe student who answered the question was John.I know the reason why he was so angry.The boy (whom) you are talking to is my brother.I'd like a room whose window looks out over the sea.Relative Clause with where, when and why, where, when, why 引导的定语从句关系副词where, when 引导的定语从句可提供时间和地点的信息，在reason后可用why 引导的定语从句。
介词+ which /whom 引导的定语从句关系代词可做介词的宾语，通常在which和whom前加介词即介词+which/whom 结构This is the book for which he is looking.可以根据定语从句所修饰的名词或代词来选介词，也可以依据从句的相关动词来选用。
但在日常英语中，通常是吧介词放在从句句末，省略关系代词which 和whomThe train(which /that) I’m travelling on is for Shanghai.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：●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 letter that/which is written in pencil is difficult to read. (主语)2. Do you know the gentleman that/who spoke just now?3. You can take anything ( that) you like. （宾语）4. What is the question (that/which) they are talking about?5. Here is the man ( who/whom/that ) you want to see.6. She's no longer the girl ( that) she used to be before.（表语）7. Our hometown is no longer the one (that) it used to be.= Our hometown is not the same as it used to be.= Our hometown is different from what it used to be。
= Our hometown is not what it used to be.●which: 指物；在定语从句中作主语，宾语，表语，定语。
如：1. The book which/that was on the desk was bought by my father.（主语）2. The book (which/that) I bought yesterday is very interesting.（宾语）3. The factory in which his father works is far from here.4. He was proud, which his brother never was. （表语）5. Tom spent four years in college, during which time he learned French.（定语）6. He may be late, in which case we ought to wait for him.●who, whom, whose:who: 主格, 在从句中作主语，在口语或非正式用法中作宾语; 只可指人whom: 宾格，在从句中作宾语; 只可指人whose: 属格，在从句中作定语，可指人也可指物。
I like the students who/that work hard. （主语）All who heard the story were amazed. (代词如he, they, any, those, all, one等后多用who.) Chaplin, for whom life had once been very hard, was a success as an actor. （宾语）He's a man from whom we should learn.= He's a man (whom/who/that) we should learn from.比较：He is the student whom you think to be worthy of your praise.He is the student who you think is worth praising.A child whose parents are dead is called an orphan.（指人）I'd like a room whose window faces south. （指物）=I'd like a room of which the window faces south.=I'd like a room the window of which faces south.There is a teapot shaped like a Chinese duck, out of whose mouth tea is supposed to come关系代词作介词宾语: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。
关系代词who 和that 用作介词宾语时, 介词必须放在句末.）This is the book for which you asked.=This is the book (that/which) you asked for.Do you know the person with whom I shook hands？= Do you know the person (whom/who/that) I shook hands with?The beginning of agriculture was a big step in human progress with which nothing could compare until our information age.In the dark street, there wasn't a single person to whom she could turn for help.Is this the factory to which you paid a visit last week?Is this factory the one to which you paid a visit last week?This is the girl whom they are looking after. (介词after与look构成固定词组，不可前置。
look at, look for, look after, take care of等)●as 的用法:(as 引导定语从句, 在定语从句中作主语、宾语、表语)①如为限制性的，多用于the same …as ; the same as；such …as …; as many/much as；so …as等结构中。
如：※I have the same book as you (have). 我有一本和你的一样的书。
Her attitude to him was quite the same as it had always been. (关系代词as和指示代词same连用, 在从句中用作表语, 先行词是same.).---Why didn't you mention that in face of the police just now?--- I thought it was such a minor detail as was hardly worth mentioning.We will only discuss such problems as have something to do with our own interests.Don't do such things as you are not sure about.There is no such place as you dream of in all this world.比较：I live in the same house that he used to live in.I'm wearing the same shirt as you wore yesterday.比较：Here is so big a stone as no one can lift. （定语从句）Here is so big a stone that no one can lift it.（结果状语从句）②如为非限制性的，多单独引导一个定语从句，这种定语从句可置于句首，句中或句尾，译为"正如，这一点"。