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1、功能：相当于形容词，修饰名词或代词，在句中作定语一：先行词：被定语从句所修饰的词二：关系代词：用来连接定语从句，并在从句中代表先行词的代词。
先行词是物：which that先行词是人：who whom that在从句中充当的成分：主语、宾语（1）先找关系词，看先行词指的是什么。
（2）看关系词在从句中所充当的成分。
e.g. 把下列每对句子合并成含有定语从句的主从复合句1. They had a radio. It could send out messages.They had a radio which/ that could send out message. (主语)2. The girl is my best friend. She spoke just now.______________________________________________________3. He always buys some books. He never read them.______________________________________________________注意点：1.）定语从句一般直接跟在先行词的后面：e.g. 4. The man who lives next door sells vegetables.The man sells vegetables who lives next door. ( × )5. The car which my uncle just bought was destroyed in the earthquake.The car was destroyed in the earthquake which my uncle just bought. ( × )2．）关系代词在从句中作宾语时可以省略：e.g. 6. The young man ( whom ) you saw was our manager.7. There is something ( that ) we must keep in mind.找出句中的从句并圈出先行词说出关系代词在从句中的成分1. The man who told me the news refused to give me the name.2. The airline has a booklet which will tell you most of the important things about a trip to Europe.3. He found a dollar bill that he had forgotten in a suit .4. He is the man whom we all respect.5. There is somebody who wants to see you.6. The house I would like to buy is not for sale.7. The bicycle my uncle gave me was very expensive.whose 的用法：关系代词与其后的名词构成所有格，即“的”时，它既可以修饰指人的先行词，也可以修饰指物的先行词。
定语从句1、功能：相当于形容词，修饰名词或代词，在句中作定语一：先行词：被定语从句所修饰的词二：关系代词：用来连接定语从句，并在从句中代表先行词的代词。
先行词是物：which that先行词是人：who whom that在从句中充当的成分：主语、宾语（1）先找关系词，看先行词指的是什么。
（2）看关系词在从句中所充当的成分。
e.g. 把下列每对句子合并成含有定语从句的主从复合句1. They had a radio. It could send out messages.They had a radio which/ that could send out message. (主语)2. The girl is my best friend. She spoke just now.______________________________________________________3. He always buys some books. He never read them.______________________________________________________注意点：1.）定语从句一般直接跟在先行词的后面：e.g. 4. The man who lives next door sells vegetables.The man sells vegetables who lives next door. ( × )5. The car which my uncle just bought was destroyed in the earthquake.The car was destroyed in the earthquake which my uncle just bought. ( × )2．）关系代词在从句中作宾语时可以省略：e.g. 6. The young man ( whom ) you saw was our manager.7. There is something ( that ) we must keep in mind.找出句中的从句并圈出先行词说出关系代词在从句中的成分1. The man who told me the news refused to give me the name.2. The airline has a booklet which will tell you most of the important things about a trip to Europe.3. He found a dollar bill that he had forgotten in a suit .4. He is the man whom we all respect.5. There is somebody who wants to see you.6. The house I would like to buy is not for sale.7. The bicycle my uncle gave me was very expensive.whose 的用法：关系代词与其后的名词构成所有格，即“的”时，它既可以修饰指人的先行词，也可以修饰指物的先行词。
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。
定语从句一.关系代词：1、who, whom, that三.辨析限制性与非限制性定语从句：1.China, which was founded in 1949, is becoming more and more powerful.2.The teacher told me that Tom was the only person that I could depend on. 。
3.China is a country which has a long history.4.His mother, who loves him very much, is strict with him.5.In the street I saw a man who was from Africa.st summer I visited the People’s Great Hall, in which many important meetings are held every year.四.限制性定语从句中只能用that 引导定语从句的情况1．当先行词是everything, anything, nothing ,something , all, none, few, little, some等不定代词时，或当先行词受every, any, all, some, no, little, few, much等代词修饰时。
如：There seems to be nothing that is impossible to him in the world.All that can be done has been done.He stayed in the library and looked up any information that they needed. 。
注意：当先行词指人时，偶尔也可用关系代词who，如：Any man that / who has a sense of duty won’t do such a thing.2．当先行词被序数词修饰时。
高一必修一定语从句知识点在英语学习中，掌握定语从句是非常重要的一个知识点。
定语从句可以用来修饰名词，使句子更加丰富多样，表达更加准确。
而限定从句则是其中的一种形式，它用来限定或修饰先行词，进一步描述或解释其特定的信息。
首先，定语从句的引导词包括关系代词和关系副词。
常见的关系代词有：that, which, who, whom, whose，以及关系副词有：when, where, why。
关系代词在从句中除了作为主语或宾语使用外，还有时充当介词宾语，即用来修饰一个介词。
例如：The book that/which I borrowed from the library is very interesting.这个从句修饰先行词"book"，关系词"that/which"充当从句中的主语。
其次，定语从句有两种类型：限定性定语从句和非限定性定语从句。
限定性定语从句是先行词的必要信息，去掉它句子结构就不完整，从句不可省略。
而非限定性定语从句则是先行词的附加信息，对句子的主要内容并没有太大的影响，从句可省略。
例如：The girl who is sitting over there is my sister.（限定性定语从句）这个从句修饰先行词"girl"，限定了是"who is sitting over there"这个特定的女孩。
例如：Tom, whose mother is a doctor, is my best friend.（非限定性定语从句）这个从句修饰先行词"Tom"，是对Tom的附加说明，可省略。
此外，需要注意定语从句中的一些特殊情况和用法。
比如，当先行词是表示时间的名词时，定语从句中的关系副词可以使用"when"或"that"引导；当先行词是表示地点的名词时，定语从句中的关系副词可以使用"where"或"that"引导；当先行词是表示原因的名词时，定语从句中的关系副词可以使用"why"或"that"引导。
必修一Unit4 语法定语从句定语可以由形容词、名词、代词、数词、分词(现在分词或过去分词)、副词、不定式(短语)以及介词短语等来充当,也可以由一个句子来充当。
充当定语功能的句子称为定语从句。
定语从句所修饰的名词或代词叫作先行词。
定语从句一般用关系代词或关系副词来引导,关系词放在先行词与定语从句之间起连接作用,同时在从句中充当某种成分。
1.关系词引导定语从句的关系代词和关系副词具体见下表:2.关系代词的用法关系代词指代先行词,在定语从句中作主语、宾语、表语、定语。
在从句中作宾语时,关系代词常可省略。
(1)that的用法that 指人或物,在从句中作主语、宾语或者表语,但that不用于引导非限制性定语从句。
Campers, in my eyes, were people that/who enjoyed insect bites, ill- cooked meals, and uncomfortable sleeping bags.在我看来,露营者是喜欢蚊虫叮咬、难吃的饭菜和不舒服的睡袋的人。
( that/who在从句中作主语,不能省略)John is no longer the person ( that/who/whom) I knew five years ago.约翰不再是我五年前认识的那个约翰了。
(that/who/whom在从句中作宾语,可以省略) When the time came to make the final decision for a course , I decided to apply for the one that/which reflected my interest.到了最后决定修一门课程的时候,我决定申请那门能反映我兴趣的课程。
(that/which在从句中作主语,不能省略) The city is no longer the one ( that ) it used to be.这座城市不再是它原来的样子了。
定语从句1、功能：相当于形容词，修饰名词或代词，在句中作定语一：先行词：被定语从句所修饰的词二：关系代词：用来连接定语从句，并在从句中代表先行词的代词。
先行词是物：which that先行词是人：who whom that在从句中充当的成分：主语、宾语（1）先找关系词，看先行词指的是什么。
（2）看关系词在从句中所充当的成分。
e.g. 把下列每对句子合并成含有定语从句的主从复合句1. They had a radio. It could send out messages.They had a radio which/ that could send out message. (主语)2. The girl is my best friend. She spoke just now.______________________________________________________3. He always buys some books. He never read them.______________________________________________________注意点：1.）定语从句一般直接跟在先行词的后面：e.g. 4. The man who lives next door sells vegetables.The man sells vegetables who lives next door. ( × )5. The car which my uncle just bought was destroyed in the earthquake.The car was destroyed in the earthquake which my uncle just bought. ( × )2．）关系代词在从句中作宾语时可以省略：e.g. 6. The young man ( whom ) you saw was our manager.7. There is something ( that ) we must keep in mind.找出句中的从句并圈出先行词说出关系代词在从句中的成分1. The man who told me the news refused to give me the name.2. The airline has a booklet which will tell you most of the important things about a trip to Europe.3. He found a dollar bill that he had forgotten in a suit .4. He is the man whom we all respect.5. There is somebody who wants to see you.6. The house I would like to buy is not for sale.7. The bicycle my uncle gave me was very expensive.whose 的用法：关系代词与其后的名词构成所有格，即“的”时，它既可以修饰指人的先行词，也可以修饰指物的先行词。
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。
定语从句一. 定语从句中的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。
二. 引导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。
三. 定语从句的分类根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，从句不可省去。
例如：Any man that / who has a sense of duty won’t 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. 这幢房子很漂亮,是我们上个月买的.注意：非限定性定语从句中不能使用关系代词 that。
四. 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.玛丽喜欢轻柔的音乐。
（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。
例如：The building which stands near the train station is a supermarket.位于火车站附近的那座大楼是一家超市。
GRAMMAR定语从句（一）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先行词。
引导定语从句的关系词有关系代词（that, which, who, whom, whose等）和关系副词(where, when, why等)。
关系词在先行词和定语从句之间起着三个作用：①连接主句和从句；②指代先行词；③在从句中作句子成分。
本单元我们先来学习关系代词引导的定语从句。
【语境展示】观察下面句子，并试着归纳关系代词引导的定语从句的用法。
1. The people who / that called yesterday want to buy the house.2. The man (whom / who / that ) I have to phone lives in Canada.3. She was not in the train which / that arrived just now.4. This is the book (which / that) you wanted.5. The girl whose work got the prize is the youngest in her class.6. It’s the house whose door is painted red.【自我归纳】①关系代词who指人，在定语从句中作主语或宾语（句1、句2）。
②关系代词whom指人，在定语从句中作宾语, 在口语和非正式文体中可用who或that替换（句2）。
③关系代词which指物，在定语从句中作主语或宾语（句3、句4）。
④关系代词that既可以指人也可以指________，在定语从句中作主语或宾语（句1—句4）。
⑤关系代词whose既可指人也可指物，在定语从句中作________（句5、句6）。
注意：关系代词在从句中作宾语时，在口语中可省略（句2、句4）。
