定语从句语法复习资料
高考英语复习6.定语从句（语法）
高考英语复习6.定语从句（语法）语法讲座：定语从句一、先行词、关系代词和关系副词1．先行词(antecedent)就是被定语从句所修饰的名词。
在英语中，定语从句跟在被修饰词之后，所以被修饰词就是“先行”的词。
2．连接定语从句，要用关系代词(relative pronoun)和关系副词(relative adverb)。
关系代词和关系副词与连接词不完全相同，因为它们除了连接主句和定语从句，还在定语从句中代替一定的成分。
二、关系代词1．who先行词是“人”，在从句中代替主语。
注意：代替从句中的主语，who不能省略。
who的单复数由先行词决定。
但是要注意“one of +先行词”与“the only one of +先行词”的情况。
2．whom先行词是“人”，在从句中代替宾语。
whom在从句中经常可以省略，但如果在介词后面，则不能省。
3．which先行词是“物”，在从句中可以代替主语或宾语。
which代替主语时，不能省略，它的单复数由先行词决定。
which 代替宾语时则经常省略，但如果在介词后面，那么也不能省略。
which的先行词有时还可以是前面的整个句子，这时它总是看成单数，也不能省略。
4．that先行词可以是“人”，也可以是“物”，在从句中可以代替主语或者宾语。
that代替主语时，不能省略，代替宾语时则经常省略。
that不能用在介词之后。
在以下三种情况时，我们一般不用关系代词who, whom, 和which，而只用that：1）先行词是不定代词如anything, something, all等词，或由all, every, little, any, much, the very 等词所修饰；2）先行词前有最高级形容词或序数词所修饰；3）先行词是由and连接的两个词，分别指“人”和“物”。
5．whose先行词可以是“人”，也可以是“物”，在从句中代替定语。
whose不能省略。
如果先行词是“物”，我们也可以用sth. of which代替whose。
(完整版)定语从句知识点大全
(完整版)定语从句知识点大全什么是定语从句？定语从句是英语中常用的一种修饰句子成分的从句形式。
它通常用来修饰名词或代词，在句子中起定语的作用。
定语从句一般由关系代词或关系副词引导，并且与被修饰的名词或代词有一定的关系。
关系代词的用法关系代词用来代替先行词，并引导定语从句。
常用的关系代词有：- who: 指人，作主语- whom: 指人，作宾语- which: 指物，作主语或宾语- whose: 所有格，指人或物- that: 指人或物，作主语或宾语关系副词的用法关系副词用来引导定语从句，并表示地点、时间、原因等关系。
常用的关系副词有：- where: 表示地点- when: 表示时间- why: 表示原因定语从句的形式定语从句可以是限制性的，也可以是非限制性的。
限制性定语从句限制性定语从句是对先行词进行限定和修饰的从句，如果去掉，整个句子的意思就不完整或失去了关键信息。
限制性定语从句通常使用关系代词和关系副词引导，关系代词在从句中作主语或宾语。
非限制性定语从句非限制性定语从句是对先行词进行补充说明，它对整个句子的意思并不具有限制作用，就算去掉也不会影响主句的表达。
非限制性定语从句通常使用逗号将其和主句隔开，关系代词在从句中作主语或宾语。
定语从句的位置定语从句可以放在先行词之后，也可以放在先行词之前。
定语从句的例句- I have a friend who lives in New York.（非限制性定语从句）- The book that you borrowed is on the desk.（限制性定语从句）以上就是关于定语从句的一些基本知识点。
定语从句在英语语法中是一个重要的内容，掌握好定语从句的用法可以有效地提升我们的写作水平。
希望本文对您有所帮助！。
定语从句复习
( D ) 1. At that time I didn’t know _________. A. to go to which school B. to go which school C. which school to go D. which school to go to ( B )2. —I don’t know _____ remember the new English words. —Don’t worry! Try to think about their pronunciations A. what to B. how to C. where to D. when to ( C )3 .They arrived at the hotel just now. They don’t know which room_________. A. to live B. for living C. to live in D. to living
Choose the correct word to fill in the blanks.
when, which, how, whether, where 1. ----Please tell me ________ to get to the TV station. how ----Follow me, please. I’ll go there soon. which 2. There are so many beautiful flowers. I can’t decide ______one to buy. 3. I don’t know _______ where to find my book. The room is so large. when to leave for Shanghai? 4. ----Could you tell me ______ ----Tomorrow evening. 5. ----I can’t decide whether _______ to go to the party or not. ----I wish you could go there.
定语从句相关知识点总结
定语从句相关知识点总结一、定语从句的概念。
1. 在复合句中，修饰某一名词或代词的从句叫定语从句。
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。
- 例如：I like the book which/that is very interesting. 其中“book”是先行词，“which/that is very interesting”是定语从句，用来修饰“book”。
二、关系代词的用法。
1. that.- 既可以指人也可以指物，在从句中作主语或宾语。
- 当先行词是all, much, little, something, everything, anything, nothing, none等不定代词时，关系代词用that。
- 例如：All that can be done has been done.（先行词是“All”，关系代词“that”在从句中作主语）- 当先行词被序数词或形容词最高级修饰时，关系代词用that。
- 例如：This is the best film that I have ever seen.（先行词“film”被最高级“the best”修饰，关系代词“that”在从句中作宾语，可省略）- 当先行词被the only, the very, the same等修饰时，关系代词用that。
- 例如：This is the very book that I want.（先行词“book”被“the very”修饰，关系代词“that”在从句中作宾语）2. which.- 指物，在从句中作主语或宾语。
- 例如：The book which/that is on the desk is mine.（“which/that”在从句中作主语）；I like the book which/that you lent me.（“which/that”在从句中作宾语）- 在非限制性定语从句（从句与主句之间用逗号隔开）中，只能用which，不能用that。
定语从句知识点归纳
定语从句复习一、语法知识归纳定语从句( Attributive Clause) 句子作定语叫做定语从句。
定语从句放在先行词之后。
Ⅰ定语从句的引导词：关系代词和关系副词。
1. 关系代词(Relative pronoun)Do you still remember the chicken farm (that) we visited three months ago?I live in the house whose window faces the street. (＝I live in the house the window of which faces the street.)2. 关系副词We are living in an age when many things are done on computer.Ⅱ定语从句的分类：限制性定语从句和非限制性定语从句。
限制性定语从句（一）限制性定语从句的基本特征：限制性定语从句对被修饰的先行词有限定制约作用，使该词的含义更具体，更明确。
限制性定语从句不能被省略，否则句意就不完整。
从句与先行词之间没有逗号。
He has two sons who work in the same company. (Perhaps he has more than two sons.)（二）限制性定语从句中关系代词的用法1. that, which当先行词指物，并且关系代词在定语从句中充当主语或宾语时，用which/that引导定语从句。
在限制性定语从句中有些情况下只能用关系代词that，不用which。
(1) 当先行词是不定代词all, much, little, something, everything, anything, nothing, none, the one时。
You should hand in all that you have.(2) 当先行词前面被the only, the very, any, few, little, no, all等词修饰时。
定语从句(语法复习)
6. The house whose roof was blown away by the storm will be rebuilt soon.
四、关系代词which和that的区别：A.关 系代词必须用that的情形：
定语从句
The Attributive Clause
一、定语从句的定义：
用来修饰名词或代词的从句叫定语从句。 被定语从句所修饰的名词或代词叫先行词 （antecedent）。定语从句一般是由关系代词 或关系副词来引导的。相当于名词，形容词 和副词的作用。
1.Do you know the man who came to see Xiao Yang this morning?
He was late again, which made the
teacher very angry.
一些典型句子。1. Is this the factory that/ which you visited yesterday?
2. Is this factory the one (which/ that) you visited? 3. He is one of the students who work hard in his class. 4. He is the/only one of the students who works hard in
I will never forget the day which/that we spent together.
I will never forget the day when/ on which I first met you.
高中英语语法定语从句总复习
高中英语语法定语从句总复习一、关系代词引导的定语从句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主语Whom which that宾语Whose (=of whom) Whose (=of which) that例１：This is the detective who came from London.例２：The book which I am reading is written by Tomas Hardy.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 burst into tears.（所有人都迸出眼泪。
）(2) 如果先行词被形容词最高级以及first, last, any, only, few, most, no, some, very 等词修饰，关系代词常用that,不用which, who，或whom。
(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。
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。
在这种从句中，which可以作主语，也可以作宾语或表语，多数情况下意思是与and this 相似，并可以指人。
例如：He succeeded in the competition, which made his parents very happy.(5) that可指人或物，在从句中作表语，（指人作主语时多用who）仅用于限制性定语从句中。
高中英语语法——定语从句复习
3 关系副词——作状语
介词+which
Where
介词+which
When
地点状语
room, table, chair, place, factory, school...; 抽象名词: point, stage, situation, case...
时间状语
day, night, week, month, year, time, age....抽象名词 occasion
That building which stands in front of me is a library.
10
2 Exercise: Which V.S That
•1.Tom is the cleverest boy
___t_h_a_t____ I have ever
known.
•2.This is the ring on __w_h__ic_h_
on social media ________ expressed their sadness over his death.
A．which B．who C．where D．what
• 6．Li Ying is one of the girls _______ to college in the village.
2. This is the swimming pool __w__h_ic__h__ I used to swim in. This is the swimming pool _____in_____ __w__h_i_c_h__ I used to swim. This is the swimming pool __w_h__e_r_e__ I used to swim.
语法专项复习定语从句.
that。 e.g. A plane is a machine that can fly.
考点二：连接词which的用法
Which引导非限定性定语从句，其先行词可是一个词,也可是整 个主句或主句的某一部分。
e.g. 1. She heard a terrible noise, __ B ____ brought her heart into her mouth. A. it B. which C. this D. that
②as引导非限制性定语从句。as在从句中作主语、 表语或宾语，这个定语从句是说明整个句子， 它可以放在主句之前。
四、关系代词 which和as 在定语从句中的区别：
which-从句不能放在句首，而as-从句则能；在句中 时， as 有“正如”、“就象”之意，而 which 则 没有 。
eg：
I like the same book as you do .(as作宾语) I shall do it in the same way as you did.(as作状语) I want to have such a dictionary as he has. （as作宾语）
I happened to get thiatt in the bookstore yesterday. ④将关系词移至该句句首。－－成为从句。 ⑤把从句放在先行词之后。－－完成。
The book is very interesting. (that) I happened to get in the bookstore yesterday
e.g. 1. In the dark street, there wasn’t a single person ______D______ she could turn for help. A. that B. who C. from whom D. to whom 2. He paid the boy $10 for washing the windows, most of ____D____ hadn’t been cleaned for at least a year. A. these B. those C. that D. which
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
高考英语复习定语从句
语法复习四：定语从句（一）定语从句一般由关系代词和关系副词引导1、关系代词：who, whom, whose, which, that, as2、关系副词：when, where, why关系代词和关系副词必须位于从句之首，主句先行词之后，起着连接先行词和从句的作用，同时在从句中又充当句子成分。
e.g. She is the girl who sings best of all.（关系代词who在从句中作主语）The comrade with whom I came knows French.（whom在从句中作介词with的宾语）3、关系代词和关系副词的用法：1）当先行词为人时用who 作主语，whom作宾语；2）当先行词为物或整个句子时用which ，可作主语或宾语；3）先行词为人、物时用that ，可作主语或宾语；4）whose用作定语，可指人或物；5）关系副词when（指时间，在定语从句中作时间状语，where（指地点，在定语从句中作地点状语），why（指原因，在定语从句中作原因状语）。
（二）限制性定语从句与非限制性定语从句1、限制性定语从句：从句与主句关系密切，去掉从句，主句意义不完整，甚至不合逻辑。
e.g. I was the only person in our office who was invited.（去掉定语从句，意思就不完整）2、非限制性定语从句：从句对先行词关系不密切，去掉定从句，意思仍然完整。
形式上用逗号隔开，不能that用引导。
e.g. Tom’s father, who is over sixty, still works hard day and night.（who引导非限制性定语从句，整个句子可分成两句来翻译）（三）使用定语从句时特别注意的几个问题1、that与which的区别。
1）用that而不用which的情况：①先行词为不定代词all, anything, nothing, …；②先行词有最高级修饰，有序数词修饰；③先行词有only, very, any等词修饰；④先行词既有人又有物时。
定语从句考点复习
5. 定语从句内容为解释名词的性质、概念时， 需用that。（先行词作表语）
e.g. A plane is a machine that can fly.
考点二：连接词which的用法
known to us.
that
21.Einstein is such a great scientist a_s_we must learn
from.
that
22. The student _w_h_o_’_s book I had borrowed didn’t whose
come to school today.
13. Those at the desk want to buy tickets write down your names.w^ho
14. That was the reason b_e_c_a_u_s_e she looked old. why
15. Miss Chen is the only one of the few teachers who g__iv_e_ us wonderful English lessons in our school. gives
Which引导非限定性定语从句，其先行词可是一个词, 也可是整个主句或主句的某一部分。
e.g. 1. She heard a terrible noise, __B____ brought her heart into her mouth. A. it B. which C. this D. that
23. Who is the worker _w_h_o_took some pictures of the
定语从句复习
关系副词及相应介词 结构
when,during which time where, in which, from which why, that, for which
Shifang Vocational School
A
5. The train _____ she was travelling was late. A. Which B. Where C. On which D. In that
c
6. I like the second football match ____ was held last week. A. which B. Who C. That D. /
5) 当先行词为“人+物”时
Shifang Vocational School
语法学习——定语从句
注意二：限制性定语从句与非限制性定语从句 1. 限制性定语从句是句中不可缺少的组成部分， 如把它省去，先行词的意思不明确。主句也不完整。 从句和主句之间不可用逗号分开。 2. 非限制性定语从句是对先行词的附加说明， 如果省去，也不影响主句的意思。 它和主句之间往往用逗号分开。 The train which has just let is for Shanghai.
The book that I read just now is hers.
The people (that) you were talking to are Russians. (That 用作介词to的宾语，常省略， 介词to 紧随动词之后，不能放在that前面。) Shifang Vocational School
高中英语2025届高考语法复习定语从句知识讲解练习
高考英语语法复习定语从句知识讲解练习1.定语从句定义定语从句是用来修饰名词或代词的从句。
可分为限定性定语从句和非限定性定语从句。
1.限制性定语从句：对先行词起限定修饰作用He is a man who likes travelling and reading.和主句关系密切，不用逗号隔开，去掉主句,句子不完整。
2. 非限制性定语从句：对先行词起修饰作用(先行词与定语从句之间用逗号隔开)The house, which I bought last year, has a beautiful garden.也可以对主句起修饰作用He was late again, which made his teacher angry.和主句关系不密切，用逗号分开，去掉主句，句子完整。
2.先行词先行词是被定语从句修饰的成分。
先行词可以是名词、代词或整个主句。
先行词是指人时，可用that, who, whom, whoseThis is the person ( who/whom/that ) you want to see.先行词是指物时，可用which, that, whoseI like to live in a room that / which has a window facing south.3.关系词关系词：关系代词和关系副词两种关系代词：that, which, who, whom, whose, as在从句中作主语，宾语，表语，定语先行词是指人时，可用关系代词：that, who, whom, whoseThis is the person ( who/whom/that ) you want to see.先行词是指物时，可用关系代词：which, that, whoseI like to live in a room that / which has a window facing south.I like to live in a room whose window faces south.=I like to live in a room of which the window faces south.=I like to live in a room the window of which faces south.关系副词：when, where, why 在从句中作状语先行词是表示时间的名词时，可用when, in which, on which等；I never forget the day when / on which I came to this school.先行词是表示地点的名词时，可用where, in which, at which等；The factory where / in which his father works is far from here.This is the factory where /in which he works.如果定语从句修饰point，situation，part，condition和case等表示抽象意义的词，常用where 引导We have reached a point where a change is needed.区分：there’s one point that we must insist on.先行词是表示原因的名词时，可用why, for which等。
语法知识—定语从句的知识点总复习附解析
一、选择题1．一What kind of musician does Carmen like?一She likes musicians __________play different kinds of music.A．which B．who C．whom2．—Do you know the man is talking with our teacher?—Oh, he is Tony’s father.A．which B．who C．whose D．what3．Shirley is the girl ______ taught me how to use Wechat(微信).A．whom B．which C．who4．The painting by Picasso ________ is about people’s love for life is shown in the museum. A．who B．which C．what5．-Have you found the information about the famous people ______ you can use for the report? -Not yet. I’ll search some on the Internet.A．who B．what C．whom D．which6．This is the best movie_________ I have ever seen.A．that B．it C．which D．what7．Running man is a very relaxing TV program_______is hot among the young people.A．what B．which C．who D．whom8．---Have you found the information you can use for your report? ---Yes.A．who B．where C．what D．which9．The four tools _________ people use for Chinese handwriting are called“Four Treasures of Study”.A．that B．who C．what D．whom10．The movie ____ I have seen twice is The Wandering Earth.A．who B．that C．where D．when11．The foreigner teaches English in our school is from England.A．what B．which C．who12．Do you know the girl_______ is drawing a picture?A．when B．whose C．which D．who13．I’ll tell you everything __________ I know.A．which B．who C．that D．what14．My grandparents like stories __________ have happy endings.A．they B．who C．which D．/15．Do you like the music that you relaxed?A．make B．making C．makes16．—Do you know the girl is talking with our teacher?—Oh, she is my sister.A．which B．what C．whose D．who17．The boy _______won the first prize is called Joy.A．when B．whom C．which D．who18．—Do you like watching movies?—Yes. I prefer movies ________give me something to think about.A．that B．what C．when D．who 19．—Have you found the details of Yuan Longping ________ you can use for your report?—He is so famous that I’ve easily got plenty on the Internet.A．where B．which C．what D．who20．Rosa likes music ______ is quiet and gentle.A．when B．that C．where D．who21．The film brought the hours back to me ________ I was taken good care of in that far-away village.A．which B．who C．when D．where 22．—This is the reason ________he gave for his absence from school.—It is the least believable excuse ________I have ever heard.A．that; that B．why; / C．why; which D．for which; that 23．—Have you finished the book ______________you borrowed from the library?A．which B．where C．what D．whose24．—Do you know the boy ________ is talking to Mr. Smith?—Yes, he’s my brother.A．what B．which C．whose D．who25．Lots of people like Tale of Yanxi Palace, the most popular TV play________is based upon an online novel.A．what B．who C．which D．that【参考答案】***试卷处理标记，请不要删除一、选择题1．B解析：B【解析】【详解】句意：——卡门喜欢什么样的音乐家？——她喜欢演奏不同种类音乐的音乐家。
高中英语语法复习专题讲解-定语从句
高中英语语法复习专题讲解-定语从句一、定义及相关术语1．定语从句：修饰某一名词或代词的从句叫定语从句。
定语从句一般紧跟在它所修饰的先行词之后。
2．先行词：被定语从句修饰的词叫先行词。
3．关系词：引导定语从句的词叫关系词。
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when, where, why等。
关系词通常有下列三个作用：A、引导定语从句；B、代替先行词；C、在定语从句中担当一个成分。
例如：The man who is shaking hands with my father is a policeman.该句中，who is shaking hands with my father 是定语从句，修饰先行词the man，“who”是引导定语从句的关系词，代替先行词the man，在定语从句中作主语。
二、定语从句的种类以及区别定语从句分为限制性定语从句和非限制性定语从句，现将它们之间的用法及区别列表如下限制性：她有两个当解放军的儿子。
非限制性：她有两个儿子，他们都是解放军。
She has two sons，三、关系代词的用法区分1.修饰物体时关系代词that和 which的区分•只能使用that的情况：（1）当先行词即有人又有物时。
eg. I won’t forget the things and the persons that I saw.（2）当先行词被形容词最高级、序数词所修饰时。
eg. This is the first book that I bought myself.The biggest bird that I caught is this bird.（3）当先行词所在句子含疑问词who，which时。
eg. Which is the book that you bought yesterday？（4）当先行词被the very, the right, the next, the only 等强调词修饰时。
定语从句 高考英语考点-语法-词汇复习资料
They won the game, which we hadn’t expected.
As is well known, he is a famous film star in the 1980s.
the same... as和
②Mr Li has three daughters，but none of _____ is a dancer．
从结构上看，①小题是定语从句，故填whom；
②小题有并列连词but，是并列句，故填代词them。
定语从句
与
状语从句
定语从句的前面有名词作先行词，而状语从句没有先行词。
This is the place where we used to live a few years ago.
注意：the way做先行词时，定语从句可由that, in which引导或不用引导词。
IV.定语从句与其它从句（句型）的区别
类别
区别
例句
定语从句
与
并列句
定语从句与并列句的主要区别在于：并列句有像and，but，so等并列连词或两个句子用分号连接，这时就不能再用引导定语从句的关系词了。
①Mr Li has three daughters，none of _____ is an engineer．
2.I like the person to whom the teacher is talking.
3.Those who respect others are usually respected by others.
III. as、which和that的区别
从句
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定语从句复习资料
限定性定语从句复习资料
一，关系代词引导的定语从句
1.关系代词that的用法
A不用that的情况
（1）在引导非限定定语从句时
（2）介词后
B只能用that作为定语从句的关系代词的情况：
（1）在there be 句型中
（2）不定代词做先行词时
（3）先行词被the only，the very，the same，the last，just修饰时（4）先行词为序数词，数词，形容词最高级时
（5）先行词既有人又有物时
（6）先行词指物，在主句中做表语时
（7）先行词是the way时
（8）先行词前面有疑问代词时
（9）关系代词在定语从句中做表语时
二，关系代词的用法
1.who指人，在从句中做主语。
2.whom也指人，在定语从句中充当宾语（who和whom没太大区别，可通用，唯一区别是who可以做主语而whom不可以）。
3.which指物，在定语从句中做主语或宾语，做宾语时可以省略。
4.that指人时相当于who和whom，指物时，相当于which。
5.whose可以指人或物，在定语从句中做定语。
三，注意
1.含有介词的动词短语不能拆开使用
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that；指物时用which，不能用that；关系代词是所有格时用whose
3.“介词+关系代词”前可有代词或数词
四，关系副词引导的定语从句
1.when指时间，where指地点，why指原因
2.注意：关系副词引导的定语从句可以由“介词+关系代词”引导的定语从句替换
非限定性定语从句
非限定性定语从句的作用是对所修饰的成分进一步说明，通常是引导词和先行词之间用逗号隔开，将从句部分去掉后其他部分仍可成立1.which引导的非限定性定语从句用来说明前面整个句子的情况或主句的某一部分。
2.当先行词被专有名词或物主代词和指示代词所修饰的其后的定语
从句是非限定的。
3.非限定性定语从句还能将整个主句作为先行词，对其进行修饰，这时从句谓语要用第三人称单数形式。
4.有时as也可用作关系代词
5.在非限定性定语从句中，不能用关系代词that和关系副词why，而用who和whom代表人，用which，whose代表物。
6.as/which的特殊定语从句的先行成分
（1）形容词或形容词短语做先行成分，具有形容词意义的介词短语也可以充当先行成分
在一定的语言环境里，一些名词具有形容词的性质，这些名词主要是表示人的身份，状态的名词，在这些具有形容词词性的名词之后，应到定语从句的关系代词不能用who和whom。
（2）动词短语的先行成分
这种短语既可是限定形式也可是非限定形式，他们在从句中就一定有限定或非限定形式的替代动词do和as/which一起代替，do可以出现，也可以不出现，但不能用其他动词代替
（3）句子做先行成分
这句子可以是整个主句也可以是主句中的一个从句，有时是连续几个句子，有时甚至可以是一个完整的故事。
#学习定语从句重难点
一，as和which引导的限定性定语从句和非限定性定语从句有相同之处有不同之处。
1.as和which都可以在定语从句中做主语或宾语，代表前面整个句子
2.as引导的非限定性定语从句可放在主句前后，甚至可以切割一个主句；which引导的非限定性定语从句只能放在主句之后，另外，as有正如……正像的……的意思
注意：当主句和从句上存在逻辑因果关系时，常用which。
3.当先行词受such，the same修饰时，常用as
注意：当先行词受the same 修饰时，偶尔也可用that引导定语从句，但是和由as引导的定语从句意思不同
定语从句such……as……和结果状语从句such……that的区别：as 在所引导的定语从句中做主语，宾语，that在结果状语从句中不作成分
二，以the way为先行词的定语从句通常由in which，that引导，而且通常可以省略。
三，but有时可以作关系词引导定语从句。
学习定语从句还要结合语法书。