定语从句完整课件
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定语从句专题讲解课件（共53张PPT）
定语从句专题讲解课件（共53张PPT）whose作定语从句的定语.Iknowthegirlwhosemotherisateacher.分解Iknowthegirl.Thegirl’smotherisateacher.作定语that可以作定语从句的主语和宾语.注意:关系代词作动词宾语时可省略.Thewoman(whom/that)theywantedtovisitisateacher.有时只能⽤that,不⽤which,常见的情况有六种：当先⾏词是all,any,few,little,none,anything,everything,nothing,everybody,nobody,everyone,noone或被它们修饰时。
1).That’sallthatIknow.2).IsthereanythingthatIcandoforyou?3).Heans weredfewquestionsthattheteacherasked.2).Thefirstt hingthatIshoulddoistoreviewmylessons.3.当先⾏词有thevery,theonly,thesame等修饰时。
1).That’stheonlythingthatIcandonow.2).Thesearetheverywordsthatheused.2.当先⾏词被形容词最⾼级或序数词修饰时1).ThatisthemostinterestingbookthatIhaveeverread.5.先⾏词同时包括⼈或物时，关系词⽤that.ThemanandhisdogthatIalwaysmeeta restandingbythegate.Whoisthegirlthatspoketoyoujustnow?Whichisthepenthatyoulost?4.当主句以who或which开头时，定语从句的关系词⽤that,⽽不⽤which或who.关系代词只⽤which不⽤that情况1.关系代词前有介词。
定语从句PPTPPT课件
避免歧义
在构造定语从句时，要避免产生歧义， 确保读者能够准确理解句子的含义。
06
定语从句的练习和例句
选择题练习
01
02
03
选择题练习一
The book _____ was written by Smith is very interesting.
选择题练习二
The school _____ we visited last year is very famous.
详细描述
关系副词包括when、where、why等 ，用于引导定语从句，表示时间、地 点或原因等状语成分，修饰先行词。
特殊引导词引导的定语从句
总结词
特殊引导词用于引导定语从句，表示特定的含义或限定条件 。
详细描述
特殊引导词包括as、than、but等，用于引导定语从句，表 示特定的含义或限定条件，修饰先行词。
例句分析一
The book (that/which) I bought yesterday is very interesting.
例句分析二
The teacher (who/that) is very popular among students is from the United States.
选择题练习三
The person _____ you talked about just now is our teacher.
填空题练习
填空题练习一
The book _____ was written by the famous author is very popular.
填空题练习二
The school _____ has a beautiful campus is very popular.
在构造定语从句时，要避免产生歧义， 确保读者能够准确理解句子的含义。
06
定语从句的练习和例句
选择题练习
01
02
03
选择题练习一
The book _____ was written by Smith is very interesting.
选择题练习二
The school _____ we visited last year is very famous.
详细描述
关系副词包括when、where、why等 ，用于引导定语从句，表示时间、地 点或原因等状语成分，修饰先行词。
特殊引导词引导的定语从句
总结词
特殊引导词用于引导定语从句，表示特定的含义或限定条件 。
详细描述
特殊引导词包括as、than、but等，用于引导定语从句，表 示特定的含义或限定条件，修饰先行词。
例句分析一
The book (that/which) I bought yesterday is very interesting.
例句分析二
The teacher (who/that) is very popular among students is from the United States.
选择题练习三
The person _____ you talked about just now is our teacher.
填空题练习
填空题练习一
The book _____ was written by the famous author is very popular.
填空题练习二
The school _____ has a beautiful campus is very popular.
高中英语定语从句 课件(共23张ppt)
宾语
8. As many people as were present voted for the plan.
主语
Task2 参照task 1 中的有关内容，填写表格1：确定关系代词 的依据
关系代词 先行词（人、物） 在 从 句 中 所 作 的 成 分 （主语、宾语、定语）
that
人、物
主语、宾语
writing?
Point 2
宜用that不宜用which引导 定语从句的情况
1. 当先行词是all, little (少), few, much, any, everything, anything, nothing, none等不定代词或被这些词修饰时 2. 当先行词既包括人又包括物时 3. 当先行词被the only, the very, the last, the same 等修饰时 4. 当先行词被序数词或形容词最高级修饰时 5. 当主句是以who, which开头的特殊疑问句时
5. I know the person whose house was totally destroyed in the
earthquake.
定语
6. He lives in a house whose windows face south.
定语
7. Here is so big a stone as no one can lift.
holidays in Qingdao?
用that , when, why, where , which填空
1.I want to know the date, __w_h_e__n_you were born. 2.I have forgotten the date _th_a__t/_w_h__ic_h_ you told me. 3.Do you know the reason __w__h_y___ he is absent today? 4.That is the reason __w_h__ic_h_/_t_h_a_t_ I want to know. 5.This is the factory _w__h_e_r_e__ his father works. 6.This is the factory _t_h_a_t_/_w_h_i_c_h_ his father built.
8. As many people as were present voted for the plan.
主语
Task2 参照task 1 中的有关内容，填写表格1：确定关系代词 的依据
关系代词 先行词（人、物） 在 从 句 中 所 作 的 成 分 （主语、宾语、定语）
that
人、物
主语、宾语
writing?
Point 2
宜用that不宜用which引导 定语从句的情况
1. 当先行词是all, little (少), few, much, any, everything, anything, nothing, none等不定代词或被这些词修饰时 2. 当先行词既包括人又包括物时 3. 当先行词被the only, the very, the last, the same 等修饰时 4. 当先行词被序数词或形容词最高级修饰时 5. 当主句是以who, which开头的特殊疑问句时
5. I know the person whose house was totally destroyed in the
earthquake.
定语
6. He lives in a house whose windows face south.
定语
7. Here is so big a stone as no one can lift.
holidays in Qingdao?
用that , when, why, where , which填空
1.I want to know the date, __w_h_e__n_you were born. 2.I have forgotten the date _th_a__t/_w_h__ic_h_ you told me. 3.Do you know the reason __w__h_y___ he is absent today? 4.That is the reason __w_h__ic_h_/_t_h_a_t_ I want to know. 5.This is the factory _w__h_e_r_e__ his father works. 6.This is the factory _t_h_a_t_/_w_h_i_c_h_ his father built.
定语从句课件PPT
详细描述：练习题三是一道综合性较强的题 目，涵盖了定语从句的多个知识点。这道题 目不仅要求学生熟练掌握定语从句的规则， 还需要具备一定的逻辑推理能力。通过这道 题目，学生可以检验自己对定语从句的掌握 程度，发现并纠正自身的语法错误，进一步
提高语言表达能力。
THANKS
感谢观看
关系代词在定语从句中起 到指代先行词的作用，常 用的关系代词有that、 which、who、whose等 。
关系副词
关系副词在定语从句中起 到连接主句和从句的作用 ，常用的关系副词有 when、where、why等。
定语从句的结构
结构
定语从句通常紧跟在所修饰的名 词或代词之后，由关系代词或关 系副词引导，构成主语、谓语、
总结词：表示地点
详细描述：where在定语从句中用作地点状语，修饰表示地点的名词。它指代先 行词并在从句中充当地点状语，用以描述某个特定的地点或场所。
when的用法
总结词：表示时间
详细描述：when在定语从句中用作时间状语，修饰表示时间的名词。它指代先行词并在从句中充当时间状语，用以描述某个 特定的时间点或时间段。
当关系代词在从句中作表语时。 例如：She is not the girl that she used to be.
只能用which的情况
在非限制性定语从句中，只能用which指代物。例如
He has written a letter, which I received three days ago.
02
关系代词的用法
who的用法
总结词
用于指代人
详细描述
在定语从句中，who通常用于指代人，在从句中充当主语或宾语。例如： “The man who won the prize is a scientist.”（获奖的人是一位科学家。）
高中定语从句课件PPT(条理清晰)
关系词： 用来引导定语从句，为避免先行词的重复出现用来代替先 行词的词。分关系代词和关系副词。
常见关系词：that, which, who, whom, whose, when, where, why, as
先行词与关系词的联系
• 1）"先行词"与"关系词"的内在联系"先行词"与"关 系词"之间实质上是互等、互换的关系。也就是说， 关系词的作用就是将先行词所表达意义"代到"从 句中来起作用。例如：
二：先行词已有序数词或形容词的最高级或the last, the only等作定语时，例如：
This is the most impressive TV theater that has never been put on show before. 这是以前从未上演过的最有感染力的电视剧。
That is the only way that leads to your success . 那是通向你成功的唯一之路。
Do you know the man whom you just spoke to? 错误：I have no idea about the man whom wrote the article.
• 关系代词whose ：用于代替"表示人或物意义"的 先行词，在从句中作定语，往往与它所修饰的名 词一起构成一个名词短语在从句中担当成分。 Whose常表达"某人的、某物的"之意。例如：
• 2）“先行词”的意义决定“关系词”的选择“关 系词”的选择往往是由“先行词”自身表达的意 义，以及它在从句中的语法功能而决定的。例如：
• Some people who are successful language learners often fail in other fields.
常见关系词：that, which, who, whom, whose, when, where, why, as
先行词与关系词的联系
• 1）"先行词"与"关系词"的内在联系"先行词"与"关 系词"之间实质上是互等、互换的关系。也就是说， 关系词的作用就是将先行词所表达意义"代到"从 句中来起作用。例如：
二：先行词已有序数词或形容词的最高级或the last, the only等作定语时，例如：
This is the most impressive TV theater that has never been put on show before. 这是以前从未上演过的最有感染力的电视剧。
That is the only way that leads to your success . 那是通向你成功的唯一之路。
Do you know the man whom you just spoke to? 错误：I have no idea about the man whom wrote the article.
• 关系代词whose ：用于代替"表示人或物意义"的 先行词，在从句中作定语，往往与它所修饰的名 词一起构成一个名词短语在从句中担当成分。 Whose常表达"某人的、某物的"之意。例如：
• 2）“先行词”的意义决定“关系词”的选择“关 系词”的选择往往是由“先行词”自身表达的意 义，以及它在从句中的语法功能而决定的。例如：
• Some people who are successful language learners often fail in other fields.
定语从句课件绝对经典系列(共30张PPT)
定语从句由关系代词关系副词来引导，同位语从句由that,有时也用when ,where, whether来引导
That’s my suggestion that the boy should study hard.
There are thousands of stars in the sky that This is the house in which Luxun once lived.
定语从句
知识准备
什么是定语：
用来修饰名词或代词的词、短语、从句。 .
4.定语 修饰和限定名词和代词的词。通常由形容词，代词(多为
形容词性物主代词），数词，介词短语，动词不定式，分词和从 句（定语从句）来担当。
a kind girl, a book on the desk
I have homework to finish. the fallen leaves
This is the car ______ which I can’t go to work.
This is the car ____which the old man was knocked down
This is the car ____which a boy threw a stone.
This is the car ____which we talked .
what=all that
the chemistry lab. the same…as…“和……同样的
Xi hua who I met across in the street a few days ago has gone abroad.
当先行词为专有名词或整个句子是世界上独一无二的名词时，一般用非限定性定语从句修饰。
That’s my suggestion that the boy should study hard.
There are thousands of stars in the sky that This is the house in which Luxun once lived.
定语从句
知识准备
什么是定语：
用来修饰名词或代词的词、短语、从句。 .
4.定语 修饰和限定名词和代词的词。通常由形容词，代词(多为
形容词性物主代词），数词，介词短语，动词不定式，分词和从 句（定语从句）来担当。
a kind girl, a book on the desk
I have homework to finish. the fallen leaves
This is the car ______ which I can’t go to work.
This is the car ____which the old man was knocked down
This is the car ____which a boy threw a stone.
This is the car ____which we talked .
what=all that
the chemistry lab. the same…as…“和……同样的
Xi hua who I met across in the street a few days ago has gone abroad.
当先行词为专有名词或整个句子是世界上独一无二的名词时，一般用非限定性定语从句修饰。
完整的定语从句课件
3. 只能用which不能用that的情况 1）非限制性定语从句中
This is the book, which is written by Lu Xun.
2）That，Those（指物）作主语时 Those which are on the desk are English books.
*4.介词+which/whom在定语从句中的用法 语法作用：“介词＋关系代词”在从句中主要起关 系副词的作用，即在定语从句中充当状语： 介词如果位于作为其宾语的关系代词之前时，先行 词指人时用whom，指物时用which. (1). The girl about whom they were talking is our monitor. (2). The book in which there are many interesting things was written by Li Ming.
The Attributive Clause
定 语 从 句
一、定语从句概念
定义：修饰前面某一个名词或代词的从句 被称为定语从句. 结构： 先行词 + 关系词 + 句子
The man 先行词 who lives next to us is a policeman. 关系词. I lost the pen (which) my father bought me.
关系代词who, that, whom引导的定语从 句:
如果先行词是表示人的名词或代词， 关系代词应用who, that (作主语或宾语) whom (作宾语)
who / that 作主语. (不能省) This is the film star. The film star is very popular in China. This is the film star who/ that is very popular in China. (作主语) 1.The boy who broke the window is called Roy. 2. Do you know the man who spoke at the meeting yesterday? 3. The girl who is watering the flowers is my cousin.
人教版英语九年级全册定语从句课件 (共21张PPT).ppt
形容词作定语
形容词性物主代词 作定语
介词短语作定语
01 什么是定语
定语：对名词或代词起修饰限定作用的词或短语
形容词作定语
形容词性物主代词 作定语
介词短语作定语
前置 定语
后置 定语
o2
什么是定语从句
02 什么是定语从句
This is a dog which likes eating meat.
这是一只喜欢吃肉的狗。
2. 先行词被序数词或形容词最高级修饰时。
place that they visited in London was Big Ben.
3. 先行词被all,every,no, the only, the very, the last等修饰时。
I've read all the books that are not mine. 我已经读了所有那些不属于我的书。
exploration (勘探)
A. where
B. which C.who
3.-What can we do for the left-home children B need help?
- We could help them with their study online on weekends.
定语从句
ATTRIBUTIVE CLAUSE
01.什么是定语
目录 02.什么是定语从句
Contents 03.定语从句的分类 04.限制性定语从句 05.练习
o1
什么是定语
01 什么是定语 句子就像是一棵大树，主语、谓语、宾语（表语）是主干，定语、 状语、补语是修饰语。
一个漂亮的女孩 一个聪明的男孩 红色的苹果
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A．what B．which C．where D．whose
3.Many children，_____B___ parents are away
working in big cities，are taken good care of
in the village.
A．their
B．whose
C．of them
2.that也不可以引导非限制性定语从句。
1.We went to Mountain Tai last weekend，
_____B___，not surprisingly，was crowded
with visitors.
A．that
B．which
C．where
D．When
2.There are altogether fiftysix students in our class，__B______ is a new comer
1. The girl _w_h_o_/t_h_a_t is sitting in the chair is a good singer. 2. The skirt _w(_h_ic_h_/_th_a_t_)_ Mary bought two years ago is old. 3. Is this the novel _(t_h_a_t/_w_h_i_ch_)_ you introduced to me? 4. Where is the boy _w_h_o_/t_h_a_t broke the window? 5. Luckily none of the people_(t_h_a_t/_w_h_o_m_ ) I know were killed in the earthquake.
▐ 需要掌握知识： ▐ 1.定义 ▐ 2.关系词的分类及用法 ▐ 3.that 和which用法比较 ▐ 4.特殊定语从句
▐ Attributive Clause（定语从句）
▐ 一：概念
▐ 在复合句中，修饰某一名词或代词的从句 叫做定语从句.被修饰的名词或代词叫先行词。
He is an English teacher who likes singing songs.
② which还可以引导非限制性定语从句， 指代前面整个句子或者某个词。
1.I have lost my pen, which I like very much.
2.She was awarded a gold medal, which the whole family considered a great honor.
The room in which there is a machine is a workshop.（宾语）
注意：
① whom, which 作介词宾语时，介词一般可放 在关系代词之前，也可放在原来的位置上；但是 在含有介词的动词固定词组中，介词只能放在原 来的位置上。
This is the person whom you are looking for.
指物: that/which (主语)
属于我的那本书很贵重。 正在被建造的的学校是我们的新学校。‘ The book which/that belongs to me is valuable. The school which /that is being repaired is our new school.
Why
指原因，做原因状语
例 1. The man __th_a_t_/w__h_o__ gave you the talk yesterday is our teacher.
指人: that/who (主语)
那个站在树底下的女生是我同桌。 那个曾经伤了我的自尊的男生在那边。
The girl who/that is standing under the tree is my deskmate.
注意：
1 关系代词和关系副词在定语从句中都要 充当句子成分。
2 当关系代词充当动词和介词的宾语时可省略， 但如果介词提前的话，不可以用that,而且不可 以省略。
3 定语从句中的谓语动词要和先行词保持一致
注意：one of +名词的复数
the only/the just/the very+one of+名词复数。
你所提到的那个老师已经退休。 你所关心的那个男生犟得像头驴。
The teacher (that/whom) you referred to has retired. The boy (that/whom)you cared about is as stubborn as a donkey.
例3: The car__t_h_a__t_/w__h_i_c_h____ is red was damaged yesterday.
The boy who/that hurt my pride once is over there.
例2: The boy__(w__h_o_m__/t_h_a_t_)_____ the nurse is looking after is my friend.
指人: whom/that(宾语,可省略)
★注意 在下面几种情况下必须用that引导定语从句。
⑴ 先行词是不定代词all, few, little, much, something, nothing, anything 等。
All that we have to do is to practise every day.
Something that we heard was of great truth.
We atched the play “Teahouse”
which/that was written by Lao She.
4.你昨天所见的那个年轻人是个著名的作家。 The young man (whom/that) you saw yesterday is a famous writer.
5.一听到那个消息，那个名字叫Tom的男生刚才潸 然泪下。 6.封皮是蓝色的那本书不见了。 7.这就是我出生的村庄。 8.我永远不会忘记我哥哥参军的那一天。 9.你相信他迟到的理由吗？ 5.At the sound of the news,the boy whose name is Tom burst into tears just now. 6.The book whose cover is blue is missing. 7.This is the village where I was born. 8.I will never forget the day when my brother joined the army. 9.Do you believe the reason why he was late?
当先行词是all, everybody, nobody, anybody等不定 代词时，如关系代词在从句中当主语，则优先选用who 连接主从句。
Anybody who refused to bow was thrown into prison without trial.
Everybody who were willing to see the film signed their names here.
1.Yesterday she talked with one woman ____ huBsband died in that accident.
A. which
B. whose
C. of which D. that
st week，we watched Beijing Opera，
__D______ style was unfamiliar to most of us
例4: The question_(_th__at_/_w_h_i_c_h_) ____ I don’t understand is about grammar.
指物: that/which (宾语,可省略)
我所喜欢的科目是地理。 我不擅长的语法是定语从句。 The subject (that/which)I am fond of is geography. The grammar(that/which)I am not good at is the attributive clause.
先行词 定语从句
引导词
引导词
关系代词 :who﹑whom﹑that﹑which﹑whose
关系副词:where﹑when﹑why
▐ 二：引导词通常有三个作用： ▐ 1.引导定语从句； ▐ 2.指代先行词； ▐ 3.在定语从句中充当句子成分。 ▐ The book that you referred to is mine.
1.Whose在引导定语从句时，用作定语。 。 指人时：=the +n+of whom
=of whom +the+n 指物时：=the+n+of which
=of which+the+n
Do you know the man whose name is Wang Yu?
→ Do you know the man the name of whom /of whom the name is Wang Yu ?
4 定语从句分为限制性和非限制性两种。
5 非限制性定语从句中的关系词不可以省略。
关系代词的功能：
Who
指人做主语
Whom 指人作宾语
That
指人也指物，做主语也做宾语
Which 指物，做主语也做宾语
Whose 指人也指物，做定语，强调所属
关系
When 指时间，做时间状语
Where 指地点，做地点状语
3.Many children，_____B___ parents are away
working in big cities，are taken good care of
in the village.
A．their
B．whose
C．of them
2.that也不可以引导非限制性定语从句。
1.We went to Mountain Tai last weekend，
_____B___，not surprisingly，was crowded
with visitors.
A．that
B．which
C．where
D．When
2.There are altogether fiftysix students in our class，__B______ is a new comer
1. The girl _w_h_o_/t_h_a_t is sitting in the chair is a good singer. 2. The skirt _w(_h_ic_h_/_th_a_t_)_ Mary bought two years ago is old. 3. Is this the novel _(t_h_a_t/_w_h_i_ch_)_ you introduced to me? 4. Where is the boy _w_h_o_/t_h_a_t broke the window? 5. Luckily none of the people_(t_h_a_t/_w_h_o_m_ ) I know were killed in the earthquake.
▐ 需要掌握知识： ▐ 1.定义 ▐ 2.关系词的分类及用法 ▐ 3.that 和which用法比较 ▐ 4.特殊定语从句
▐ Attributive Clause（定语从句）
▐ 一：概念
▐ 在复合句中，修饰某一名词或代词的从句 叫做定语从句.被修饰的名词或代词叫先行词。
He is an English teacher who likes singing songs.
② which还可以引导非限制性定语从句， 指代前面整个句子或者某个词。
1.I have lost my pen, which I like very much.
2.She was awarded a gold medal, which the whole family considered a great honor.
The room in which there is a machine is a workshop.（宾语）
注意：
① whom, which 作介词宾语时，介词一般可放 在关系代词之前，也可放在原来的位置上；但是 在含有介词的动词固定词组中，介词只能放在原 来的位置上。
This is the person whom you are looking for.
指物: that/which (主语)
属于我的那本书很贵重。 正在被建造的的学校是我们的新学校。‘ The book which/that belongs to me is valuable. The school which /that is being repaired is our new school.
Why
指原因，做原因状语
例 1. The man __th_a_t_/w__h_o__ gave you the talk yesterday is our teacher.
指人: that/who (主语)
那个站在树底下的女生是我同桌。 那个曾经伤了我的自尊的男生在那边。
The girl who/that is standing under the tree is my deskmate.
注意：
1 关系代词和关系副词在定语从句中都要 充当句子成分。
2 当关系代词充当动词和介词的宾语时可省略， 但如果介词提前的话，不可以用that,而且不可 以省略。
3 定语从句中的谓语动词要和先行词保持一致
注意：one of +名词的复数
the only/the just/the very+one of+名词复数。
你所提到的那个老师已经退休。 你所关心的那个男生犟得像头驴。
The teacher (that/whom) you referred to has retired. The boy (that/whom)you cared about is as stubborn as a donkey.
例3: The car__t_h_a__t_/w__h_i_c_h____ is red was damaged yesterday.
The boy who/that hurt my pride once is over there.
例2: The boy__(w__h_o_m__/t_h_a_t_)_____ the nurse is looking after is my friend.
指人: whom/that(宾语,可省略)
★注意 在下面几种情况下必须用that引导定语从句。
⑴ 先行词是不定代词all, few, little, much, something, nothing, anything 等。
All that we have to do is to practise every day.
Something that we heard was of great truth.
We atched the play “Teahouse”
which/that was written by Lao She.
4.你昨天所见的那个年轻人是个著名的作家。 The young man (whom/that) you saw yesterday is a famous writer.
5.一听到那个消息，那个名字叫Tom的男生刚才潸 然泪下。 6.封皮是蓝色的那本书不见了。 7.这就是我出生的村庄。 8.我永远不会忘记我哥哥参军的那一天。 9.你相信他迟到的理由吗？ 5.At the sound of the news,the boy whose name is Tom burst into tears just now. 6.The book whose cover is blue is missing. 7.This is the village where I was born. 8.I will never forget the day when my brother joined the army. 9.Do you believe the reason why he was late?
当先行词是all, everybody, nobody, anybody等不定 代词时，如关系代词在从句中当主语，则优先选用who 连接主从句。
Anybody who refused to bow was thrown into prison without trial.
Everybody who were willing to see the film signed their names here.
1.Yesterday she talked with one woman ____ huBsband died in that accident.
A. which
B. whose
C. of which D. that
st week，we watched Beijing Opera，
__D______ style was unfamiliar to most of us
例4: The question_(_th__at_/_w_h_i_c_h_) ____ I don’t understand is about grammar.
指物: that/which (宾语,可省略)
我所喜欢的科目是地理。 我不擅长的语法是定语从句。 The subject (that/which)I am fond of is geography. The grammar(that/which)I am not good at is the attributive clause.
先行词 定语从句
引导词
引导词
关系代词 :who﹑whom﹑that﹑which﹑whose
关系副词:where﹑when﹑why
▐ 二：引导词通常有三个作用： ▐ 1.引导定语从句； ▐ 2.指代先行词； ▐ 3.在定语从句中充当句子成分。 ▐ The book that you referred to is mine.
1.Whose在引导定语从句时，用作定语。 。 指人时：=the +n+of whom
=of whom +the+n 指物时：=the+n+of which
=of which+the+n
Do you know the man whose name is Wang Yu?
→ Do you know the man the name of whom /of whom the name is Wang Yu ?
4 定语从句分为限制性和非限制性两种。
5 非限制性定语从句中的关系词不可以省略。
关系代词的功能：
Who
指人做主语
Whom 指人作宾语
That
指人也指物，做主语也做宾语
Which 指物，做主语也做宾语
Whose 指人也指物，做定语，强调所属
关系
When 指时间，做时间状语
Where 指地点，做地点状语