新定语从句精品PPT课件
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新人教九年级英语unit9定语从句(共29张PPT)
—That sounds good.
A. to
B. with C. for D. on
我最 棒
3. Lucy loves singers______ are creative and energetic.
A. which
B. who
C. whom
D. what
4. The action movie______ I saw last week is really exciting.
I like music that/which is loud and energetic.
I like music that/which I can sing along with.
What kind of music do you prefer?
I prefer music that/which is quiet and gentle. I prefer music that/which I can dance to.
1.代替先行词; 2.它还在定语从句中担任一定的成分; 3. 同时连接先行词与它引导的定语从句。 （把主句和从句连起来）关系词判 断 步 骤 :
1.看先行词。
先行词是指人,关系代词 who，that，whom，whose。先行词 指物，关系代词可用which或that;
2.确定关系词在从句中的成分。请看下表
= I love music that is quiet and gentle.
I prefer singers who write their own music.
= I prefer singers that write their own music.
I prefer music that is gentle.
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.
定语从句PPTPPT课件
注意不定代词的用法
不定代词在句中作主语、宾语或表语 ，需要根据其在句中的位置和作用来 确定其意义。
先行词被the only，the very等修饰时选择技巧
确定引导词
01
当先行词被the only，the very等修饰时，定语从句通常由that
引导，而不是which。
注意修饰语的强调作用
02
the only，the very等修饰语在句中起强调作用，需要特别注意
07
总结回顾与拓展延伸
关键知识点总结回顾
定义与功能
定语从句是对名词或代 词进行修饰、限定的从 句，起到进一步说明、
描述的作用。
引导词种类
关系代词（如who, which, that等）和关系 副词（如when, where, why等）引导定语从句
。
从句位置
定语从句通常位于被修 饰词之后，但有时也可 位于句首，起到强调作
who/whom引导指人非限制性定语从句
要点一
先行词为人时，引导词用who或 whom，在从句中作主语…
The man who/whom you met yesterday is my uncle. （你昨天见到的那个人是我叔叔。）
要点二
非限制性定语从句中，who可以 代替whom，但whom…
My sister, who is a doctor, lives in Beijing.（我姐姐是 北京的一名医生。）
其所强调的内容。
分析主从句的逻辑关系
03
主句和从句之间需要存在逻辑上的联系，从句需要对主句中的
先行词进行进一步的解释或说明。
06
实战演练与错误纠正
典型例题解析
例题1
初中英语定语从句-课件(共29张ppt)
Tell me the reason why you were sleeping in class. =Tell me the reason for which you were sleeping in class.
关系副词和先行词的关系
I still remember the day when I came here. on the day =when
关系副词实际上是介词＋先行词
几种易混的情况
1.I’ll never forget the days__w_h_e_n__/i_n_w__h_ic_h_ we worked together.
2.I’ll never forget the days ___w__h_ic_h____ we spent together.
4)若主句中有疑问代词 who, which 为了 避免重复, 关系代词不要再用who, which.
只能用which(表示物)的情况
1. 介词后面 The room in which there was a lot of money was broken into last night.
2. 非限制性定语从句
as 引导的限制性定语从句
Please complete the following sentences and compare:
This is such an interesting book _a_s__ we all like. This is so interesting a book ___a_s_ we all like.
3.关系副词when, where, why
as 1. the same…as
2. such+n.+ as
关系副词和先行词的关系
I still remember the day when I came here. on the day =when
关系副词实际上是介词＋先行词
几种易混的情况
1.I’ll never forget the days__w_h_e_n__/i_n_w__h_ic_h_ we worked together.
2.I’ll never forget the days ___w__h_ic_h____ we spent together.
4)若主句中有疑问代词 who, which 为了 避免重复, 关系代词不要再用who, which.
只能用which(表示物)的情况
1. 介词后面 The room in which there was a lot of money was broken into last night.
2. 非限制性定语从句
as 引导的限制性定语从句
Please complete the following sentences and compare:
This is such an interesting book _a_s__ we all like. This is so interesting a book ___a_s_ we all like.
3.关系副词when, where, why
as 1. the same…as
2. such+n.+ as
定语从句PPTPPT课件
will give us a talk.
The teacher (whom) we met yesterday
(宾语) The man is kind. Everyone likes him.
The man (who) everyone likes is kind.
The woman got the job. We saw her on the street.
空白演示经典风格
The Attributive Clause
定语从句
定语可以由形容词、代词、数词、名词、分词、不定式、介词短语等来担任，修饰名词。(以分词、介词短语为例） 例： The girl behind the tree is Kate. The man driving too fast was drunk.
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I wrote with it just now.
Can you find the pen with which
I wrote just now?
Can you find the pen (which) I wrote with just now?
Can you find the pen?
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The boy who is clever is Tom
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The boy is Tom. The boy is smiling.
(主语)
The boy who is smiling is Tom.
The boy is Tom. The boy has a round face.
注意: 固定动介词组不可分割,介词不能提前.例如:look after,look at …
The teacher (whom) we met yesterday
(宾语) The man is kind. Everyone likes him.
The man (who) everyone likes is kind.
The woman got the job. We saw her on the street.
空白演示经典风格
The Attributive Clause
定语从句
定语可以由形容词、代词、数词、名词、分词、不定式、介词短语等来担任，修饰名词。(以分词、介词短语为例） 例： The girl behind the tree is Kate. The man driving too fast was drunk.
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I wrote with it just now.
Can you find the pen with which
I wrote just now?
Can you find the pen (which) I wrote with just now?
Can you find the pen?
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The boy who is clever is Tom
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The boy is Tom. The boy is smiling.
(主语)
The boy who is smiling is Tom.
The boy is Tom. The boy has a round face.
注意: 固定动介词组不可分割,介词不能提前.例如:look after,look at …
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
定语从句完整PPT课件
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.
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。
1. 正在打篮球的男生们来自一年级。
The boys who/that are playing basketball are from Grade One. 2.照顾我姐姐的护士很善良。 The nursewho/that looks after my sister
is kind.
3.我们观看那部戏是由老舍写的茶馆。
Mary lives in the house whose roof is red.
→ Mary lives in the house the roof oபைடு நூலகம் which/of which the roof is red.
1. The student _w_h_o_s_e_father works in the factory is sitting there. 2. I like the rooms _w_h_o_s_e_windows face south. 3.This is the desk _w__h_o_se_legs were broken. 你能用别的方式改写吗？
Anybody who refused to bow was thrown into prison without trial.
Everybody who were willing to see the film signed their names here.
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。
1. 正在打篮球的男生们来自一年级。
The boys who/that are playing basketball are from Grade One. 2.照顾我姐姐的护士很善良。 The nursewho/that looks after my sister
is kind.
3.我们观看那部戏是由老舍写的茶馆。
Mary lives in the house whose roof is red.
→ Mary lives in the house the roof oபைடு நூலகம் which/of which the roof is red.
1. The student _w_h_o_s_e_father works in the factory is sitting there. 2. I like the rooms _w_h_o_s_e_windows face south. 3.This is the desk _w__h_o_se_legs were broken. 你能用别的方式改写吗？
定语从句专题讲解课件(共53张PPT)课件
which / that 作主语. (不能省)
（作主语）
which / that 作宾语 ： （可省略）
This is the card. I’ve just received the card.
This is the card which / that I’ve just received.
The man is a worker.
The man is speaking at the meeting.
分解
作主语
Whom 作定语从句的宾语
01
The woman whom they wanted to visit is a teacher.
02
The woman is a teacher.
( )
（作宾语）
( )
1
关系代词who, that, whom引导的定语从句:
whom (作宾语)
2
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)
who / that 作主语. (不能省)
a girl who likes red .
I now
定语从句
在复合句中，修饰名词或代词的句子叫定语从句。
两个句子
两个词
主 句
从句
？
01
I know a girl
02
03
who likes red.
04
Jim reads books
05
which are fun.
06
从句
07
完整的句子是主句
01
The thief has been sent to prison. The police caught the thief last night.
（作主语）
which / that 作宾语 ： （可省略）
This is the card. I’ve just received the card.
This is the card which / that I’ve just received.
The man is a worker.
The man is speaking at the meeting.
分解
作主语
Whom 作定语从句的宾语
01
The woman whom they wanted to visit is a teacher.
02
The woman is a teacher.
( )
（作宾语）
( )
1
关系代词who, that, whom引导的定语从句:
whom (作宾语)
2
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)
who / that 作主语. (不能省)
a girl who likes red .
I now
定语从句
在复合句中，修饰名词或代词的句子叫定语从句。
两个句子
两个词
主 句
从句
？
01
I know a girl
02
03
who likes red.
04
Jim reads books
05
which are fun.
06
从句
07
完整的句子是主句
01
The thief has been sent to prison. The police caught the thief last night.
2025年中考英语定语从句课件(共40张PPT)
ABC
Whom 作定语从句的宾语
The woman whom they wanted to visit is a teacher.
分解
The woman is a teacher.
They wanted to visit the woman. 作宾语
ABC
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
ABC
只能用that的情况
This is the very book that belongs to him. ④ 先行词被the only, the very, the same, the last修饰时。 Who is the girl that is standing under the tree? Which is the machine that we used last Sunday.
ABC
第二部分
ABC
定语从句的用法
who, whom, whose, that用法区别 who 作定语从句的主语或宾语
The man who is speaking at the meeting is a worker.
分解
The man is a worker.
The man is speaking at the meeting. 作主语
10、He prefers to eat the rice ___ in the south.
A. who is grown
B. which is grown
AB C C. when is grown
11、 The knife ___ I cut the apple with can’t be found.
初中定语从句完整版PPT精品课件
初中定语从句完整版（共32张PPT）
初中定语从句完整版（共32张PPT）
Choose the right answer：
1.The letter _D____I received from him yesterday is very important. A.who B. where C.what D. that
1.先行词为all，everything，nothing ，something，anything，little，much等不定代词
I’ve read all the books that are not mine. You can take any seat that is free.
2.先行词被all，every，no ，some，any，little，much 等修饰时
4.The coat _D____he is wearing today was bought by his aunt. A.what B. where C.who D./
初中定语从句完整版（共32张PPT）
初中定语从句完整版（共32张PPT）
Choose the right answer：
2.Is there anything else __________you require?
3.This is the question_A____we are talking about now. A.that B. who C.where D.when
4.I like the teacher__D____classes are very interesting and creative. A.which B.who C.what D.whose
先行词
关系词
初中定语从句完整版（共32张PPT）
Choose the right answer：
1.The letter _D____I received from him yesterday is very important. A.who B. where C.what D. that
1.先行词为all，everything，nothing ，something，anything，little，much等不定代词
I’ve read all the books that are not mine. You can take any seat that is free.
2.先行词被all，every，no ，some，any，little，much 等修饰时
4.The coat _D____he is wearing today was bought by his aunt. A.what B. where C.who D./
初中定语从句完整版（共32张PPT）
初中定语从句完整版（共32张PPT）
Choose the right answer：
2.Is there anything else __________you require?
3.This is the question_A____we are talking about now. A.that B. who C.where D.when
4.I like the teacher__D____classes are very interesting and creative. A.which B.who C.what D.whose
先行词
关系词
高中定语从句ppt课件
先行词是all, much, something, one
总结词
当先行词是 "all","much","something","one"等表示 泛指或总称的词汇时，从句的引导词通 常使用that。
Hale Waihona Puke VS详细描述例如，在句子"All that glitters is not gold."中，先行词"all"表示泛指，因此从 句的引导词使用了"that"。
先行词被形容词最高级，only, last, just修饰时，引导词用that。
先行词在从句中作补语时，引导 词用that。
先行词为all, much, something, nothing, this, that时，引导词用 that。
先行词既有人又有物时，引导词 用that。
先行词是序数词或被序数词修饰 时，引导词用that。
影响句子的完整性。
用法
通常用逗号与主句隔开，用关系代 词（which、whom、whose等） 或关系副词（when、where、 why等）引导。
例句
My sister, who is a doctor, often works late at night.（我的姐姐是 一名医生，经常工作到深夜。）
which的用法
01
02
03
04
在非限定定语从句中，先行词 指人时，引导词用who或 which。指物时，引导词用 which。
在限定定语从句中，先行词指 人时，引导词用that或who。
指物时，引导词用which。
在从句中缺主语、宾语、表语 或定语时，引导词用which。
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• 3.The book that my grandmother gave me is called “The Great Escape”.
• 4.China, which was founded in 1949, is becoming more and more powerful.
学习目标
• 1. 理解定语从句的相关概念 • 2.会正确使用关系代词和关系副词 • 3. 学会运用简单的定语从句
Eg. Have you taken down everything that Mr.
Li said.
2)先行词被序数词和形容词最高级修饰时。
The first place that they visited in London
was the Big Ben
This is the best film that I have ever seen.
Fill in the blacks
• 1. The man who is shaking hands with mWyhfaatthdeor tihseasepoliceman.
•se2n. tCenhcinesa hias vae icnountry which has a long hisCtoorym.mon?
e.g. Yesterday Emily was wearing the
new dress which I gave her.
先行词
关系代词 定语从句
I have a friend who likes listening to classi先行词 关系代词 定语从句
二、常见的关系代词和关系副词：
关系代词有（6） who, whom, whose, which, that, as。
关系副词有（3） when, where, why。
三、关系代词和关系副词的在定语从句中的作用： ①充当主语的关系代词：who，which，that，as。 ②充当宾语的关系代词：whom，which, that，as。 ③充当定语的关系代词：whose。其用法：whose既 可指人，也可指物，whose + n.= n. +of whom/of which。
出来 2. Be prepared for discussion. 准备讨论。 目 Try your best to solve the problems by yourselves. 标
Step II Team work(合作探究)
• Have a discussion with your deskmate and solve the difficulties inI,II,III, IV.
④充当表语的关系代词：that，as。 e.g. He is not the man ___C__he used to be . A. whom B. who C. that D. what
⑤充当地点状语的关系副词：where。 ⑥充当时间状语的关系副词：when。 ⑦充当原因状语的关系副词: why。 e.g. There are several reasons why we
பைடு நூலகம்
3)先行词被the only，the very，the same，the last，all，any，much，every，each，few， little，no，some等修饰时。
This is the very dictionary that I want to buy.
4当先行词前面有who，which等疑问代词时
can’t do that.
四、定语从句常见的考点：
1. 关系代词that与which的区别： ①that和which指物时，两者可以互换。但在
下列情况中，只能用that，而不能用which。 1)当先行词是不定代词all，everything，
something，nothing，anything，any， much，little，few，none等时。
e.g. The kettle, whose top (=the top of which=of
which the top) is lost, is of no use. His parents wouldn’t let him marry anyone _w_h_o__s_e__family was poor.
Step 1. Self-directed study(自主学习)
内 自主探究衔接教材p33-p36并独立完 容 学案I,II,III, IV
1. Look through the questions and your answers 要 again, underline your difficulties. 求 快速浏览你学案上的问题和答案，把不明白的问题画
Who is the man that is standing by the gate?
5)先行词既有人又有物时。
They talked about the persons and things
that they remember at school.
6)若同一个复合句里有两个定语从句，其中一个用 which，另一个只能用that。
一、定语从句概念：
1、定语从句：在复合句中起定语作用，修饰主 句中 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。
其结构：先行词+关系代词（副词）+定语从句。
2、先行词：
定语从句所修饰的这一名词或代词叫先行词。
3、关系代词和关系副词：引导定语从句的词称 为关系代词和关系副词，放在先行词和定语从 句之间，同时在定语从句中要作一定的成分。
e.g. I am looking for the dog which chased
the cat that ate the fish. ②只用which不用that
e.g. The song to which he is listening is popular.
His mother, who loves him very much, is strict with him. a. 介词+which引导定语从句时，不能用that。但介词 放在从句的后面时，两者可以互换。
• 4.China, which was founded in 1949, is becoming more and more powerful.
学习目标
• 1. 理解定语从句的相关概念 • 2.会正确使用关系代词和关系副词 • 3. 学会运用简单的定语从句
Eg. Have you taken down everything that Mr.
Li said.
2)先行词被序数词和形容词最高级修饰时。
The first place that they visited in London
was the Big Ben
This is the best film that I have ever seen.
Fill in the blacks
• 1. The man who is shaking hands with mWyhfaatthdeor tihseasepoliceman.
•se2n. tCenhcinesa hias vae icnountry which has a long hisCtoorym.mon?
e.g. Yesterday Emily was wearing the
new dress which I gave her.
先行词
关系代词 定语从句
I have a friend who likes listening to classi先行词 关系代词 定语从句
二、常见的关系代词和关系副词：
关系代词有（6） who, whom, whose, which, that, as。
关系副词有（3） when, where, why。
三、关系代词和关系副词的在定语从句中的作用： ①充当主语的关系代词：who，which，that，as。 ②充当宾语的关系代词：whom，which, that，as。 ③充当定语的关系代词：whose。其用法：whose既 可指人，也可指物，whose + n.= n. +of whom/of which。
出来 2. Be prepared for discussion. 准备讨论。 目 Try your best to solve the problems by yourselves. 标
Step II Team work(合作探究)
• Have a discussion with your deskmate and solve the difficulties inI,II,III, IV.
④充当表语的关系代词：that，as。 e.g. He is not the man ___C__he used to be . A. whom B. who C. that D. what
⑤充当地点状语的关系副词：where。 ⑥充当时间状语的关系副词：when。 ⑦充当原因状语的关系副词: why。 e.g. There are several reasons why we
பைடு நூலகம்
3)先行词被the only，the very，the same，the last，all，any，much，every，each，few， little，no，some等修饰时。
This is the very dictionary that I want to buy.
4当先行词前面有who，which等疑问代词时
can’t do that.
四、定语从句常见的考点：
1. 关系代词that与which的区别： ①that和which指物时，两者可以互换。但在
下列情况中，只能用that，而不能用which。 1)当先行词是不定代词all，everything，
something，nothing，anything，any， much，little，few，none等时。
e.g. The kettle, whose top (=the top of which=of
which the top) is lost, is of no use. His parents wouldn’t let him marry anyone _w_h_o__s_e__family was poor.
Step 1. Self-directed study(自主学习)
内 自主探究衔接教材p33-p36并独立完 容 学案I,II,III, IV
1. Look through the questions and your answers 要 again, underline your difficulties. 求 快速浏览你学案上的问题和答案，把不明白的问题画
Who is the man that is standing by the gate?
5)先行词既有人又有物时。
They talked about the persons and things
that they remember at school.
6)若同一个复合句里有两个定语从句，其中一个用 which，另一个只能用that。
一、定语从句概念：
1、定语从句：在复合句中起定语作用，修饰主 句中 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。
其结构：先行词+关系代词（副词）+定语从句。
2、先行词：
定语从句所修饰的这一名词或代词叫先行词。
3、关系代词和关系副词：引导定语从句的词称 为关系代词和关系副词，放在先行词和定语从 句之间，同时在定语从句中要作一定的成分。
e.g. I am looking for the dog which chased
the cat that ate the fish. ②只用which不用that
e.g. The song to which he is listening is popular.
His mother, who loves him very much, is strict with him. a. 介词+which引导定语从句时，不能用that。但介词 放在从句的后面时，两者可以互换。