初中定语从句课件(6篇)
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初中定语从句教学课件 篇1
一、教学目标
通过本章复习, 使学生明白定语从句的构成和用法。
二、教学重点和难点
限制性定语从句与非限制性定语从句的区别；关系代词与关系副词引导定语从句的不同；介词+关系代词引导定语从句；关系代词who, that, which的用法区别。定语从句与同位语从句及其一些句子结构的区别。
三、教学方法
Teacher
1．什么是定语从句?
2．被定语从句修饰的名词或代词叫先行词。连接先行词与定语从句的引导词叫关系词，其中 which, that, who, whom, whose 这些词叫关系代词，它们在句中用来指人或事物，在定语从句中作主语或宾语，whom 只能作宾语。作宾语时，关系代词可省略。而 when, where, why 这些词是关系副词，他们在句子中用来作状语。（请同学们根据以上所述, 给出一些例句, 用来说明。）
3．以上关系代词在使用时也是有很多区别的。（请同学们看下面的句子, 然后说出使用关系代词 that 的原因。）
A．All that is worth doing should be done well.
B．The only thing that she could do was to ask the police for help.
C．We will never forget the first lesson that our English teacher gave us.
D．What is the smallest thing that can be seen under a microscope?
E．The visitors spoke highly of the children and the performances that they saw.
F．Who is the person that let out the secret?
4．下面讲一下只能用关系代词 which 引导的定语从句。
A．在非限制性定语从句中, 指物时只能用 which 不能用 that。
B．在定语从句中, 介词+关系代词引导定语从句指物时, 只能用 which 不能用 that。
（请同学们给出上面两种情况的例句。）
5．对于“介词+关系代词”引导宾语从句, 如何选介词这个问题, 可归纳为下面几点：
A．根据宾语从句谓语动词的习惯搭配。如：Do you know the man with whom you just shook hands?
（句中的. with 来自习惯搭配 shake hands with）
B．由先行词来决定。如： I'll never forget the day on which I joined the Party.
C．由句子表达的全部意义来确定。如：Water is very important for us without which we can't live.
6．有下面两种情况：
A．先行词 all, any 和 a few 指人时, 如：
Any who breaks the law will be punished.
B．先行词是 this, that, those 或 these 且指人时。
Those who hadn't bought the ticket for the train crowded in the waiting hall.
7．请看下面句子, 然后分析一下：
A．The engineer whose son is in America is very kind.
B．Look at the house whose roof is red.
8．请看下面句子, 然后分析一下：
A．I'll go to any place where people need me.
B．I still remember the day when I joined the army.
C．I don't know the reason why he was late.
9．那么, 表示地点、时间的名词后面都被关系副词引导的定语从句所修饰吗？
10．我们知道 as 也可作为关系代词, 引导定语从句, 包括非限制性定语从句和限制性定语从句, 井且多与 such, the same as 并用。 （请同学们翻译下列的句子。）
A．我们知道, 指南针最早是中国人发明的。
B．这支钢笔和我昨天丢的那支很相似。
C．他们今年生产的钢和去年一样多。
D．我们应该和这样的热心、勤奋的人交朋友。
Students
1．在复合句中，修饰名词或代词的从句称为定语从句被定语从句修饰的名词或代词叫先行词。连接先行词与定语从句的引导词叫关系词，其中 which, that, who, whom 这些词叫关系代词，它们在句中用来指人或事物，在定语从句中作主语或宾语，whom 只能作宾语。作宾语时，关系代词可省略。
2．A．Here is the pen that you lost yesterday. （that 用来指物, 在从句中作宾语, 可以省略掉, that 也可用 which 代替。）
B．The girl who told me the news is not here now. （who 用来指人, 在从句中作主语, that 可以代替 who 用来指人。）
C．The woman who / whom / that you saw in the park is our English teacher. （whom 只能用来指人, 只能作宾语, 在从句中可以省略。）
3．刚才所说的6个句子的宾语从句, 关系代词只能用 that 而不能用其他关系代词, 下面逐个分类分析：
A．先行词是 all, much, little, none, the one 或由 no-, any-, every- 构成的复合代词时。
B．先行词被 all, every, some, little, much, the only, the very 等修饰时。
C．先行词是序数词或被序数词限定时。
D．先行词被形容词最高级修饰时。
E．先行词同时包含人和事物时。
F．当主句是 who 或 which 开头的特殊疑问句时, 为避免重复, 习惯上多用 that。
4．
A．She heard a terrible noise, which brought her heart into her mouth.
非限制性定语从句与主句用逗号隔开, 非限制性定语从句引导词不用that。
B．The games in which the young men competed were difficult.
介词in也可以放在定语从句谓语动词之后, 关系代词which或that可省略。
5．定语从句中, “介词+关系代词”引导定语从句。关系词前选什么样的介词对我们来说有时束手无策, 希望老师能够归纳出几点巧妙的判断规律。
6．When shall we use the relative pronoun“who”and“whom”?
7．这两句中的定语从句都是由 whose 引导的, 在从句中 whose 只能作定语。
A 句中 whose 修饰人。
B 句中 whose 修饰物, 这个句子相当于：Look at the house the roof of which is red. 或：Look at the house with a red roof.
8．这三个句子中, 所含的定语从句都是由关系副词引导的。
A．where 引导的定语从句修饰一个表地点的名词, where 本身作从句中谓语的地点状语, 这时, where 可由介词 to + which 来替代。
B．when 引导定语从句修饰一个表示时间的名词, when 在从句中作时间状语, when 可用介词 on＋which 来替代。
C．why 引导定语从句修饰一个表示原因的名词, why 在从句中作原因状语。why 可用介词 for + which 来替代。
从以上三个句子来看, 关系副词引导定语从句, 一般情况下, 都可用“介词+关系代词”来替换关系副词。
9．不一定。如果表地点或表时间的名词在定语从句中作主语或宾语, 就不能用关系副词引导宾语从句, 而应由相应的关系代词引导。如：
A．Mike is studying in a school that/which was built in 1928．
B．Those days that / which we spent with Mary were wonderful.
10．
A．As is known to all, the compass was first made in China.
B．This is the same pen as I lost yesterday.
C．They have produced as much iron this year as they did last year.
D．We ought to make friends with such people as kind and hard working.
初中定语从句复习课件 篇2
定语从句通常出现在先行词之后，由关系词（关系代词或关系副词）引出。
关系代词有：who, whom, whose, that, which等。
关系副词有：when, where, why等。
关系代词引导的定语从句
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，在从句中作主语和宾语。例如：
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）。例如：
They rushed over to help the man whose car had broken down. 那人车坏了，大家都跑过去帮忙。
Please pass me the book whose （of which） cover is green. 请递给我那本绿皮的书。
3）which, that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.
农村出现了前所未有的繁荣。（which / that在句中作宾语）
The package （which / that）you are carrying is about to come unwrapped. 你拿的包快散了。（which / that在句中作宾语）
关系副词引导的定语从句
关系副词可代替的先行词是时间、地点或理由的名词，在从句中作状语。
1）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。例如：
There are occasions when （on which） one must yield. 任何人都有不得不屈服的.时候。
Beijing is the place where（in which） I was born. 北京是我的出生地。
Is this the reason why （for which） he refused our offer? 这就是他拒绝我们帮助他的理由吗？
2）that代替关系副词，可以用于表示时间、地点、方式、理由的名词后取代when, where, why和"介+which"引导的定语从句，在口语中that常被省略。例如：
His father died the year （that / when / in which） he was born. 他父亲在他出生那年逝世了。
He is unlikely to find the place （that / where / in which） he lived forty years ago.
他不大可能找到他四十年前居住过的地方。
判断关系代词与关系副词
方法一： 用关系代词，还是关系副词完全取决于从句中的谓语动词。及物动词后面无宾语，就必须要求用关系代词；而不及物动词则要求用关系副词。例如：
This is the mountain village where I stayed last year. 这是我去年呆过的山村。
I'll never forget the days when I worked together with you.我永远不会忘记与你共事的日子。
判断改错：
（错） This is the mountain village where I visited last year.
（错） I will never forget the days when I spent in the countryside.
（对） This is the mountain village （which） I visited last year.
（对） I'll never forget the days （which） I spent in the countryside.
习惯上总把表地点或时间的名词与关系副词 where, when联系在一起。此两题错在关系词的误用上。
方法二： 准确判断先行词在定语从句中的成分（主、谓、宾、定、状），也能正确选择出关系代词/关系副词。
例1. Is this museum ___ you visited a few days age?
A. where B. that C. on which D. the one
例2. Is this the museum ____ the exhibition was held.
A. where B. that C. on which D. the one
答案：例1 D，例2 A
例1变为肯定句： This museum is ___ you visited a few days ago.
例2变为肯定句： This is the museum ___ the exhibition was held.
在句1中，所缺部分为宾语，而where, that, on which都不能起到宾语的作用，只有the one既做了主句的表语，又可做从句的宾语，可以省略关系代词，所以应选D。
而句2中, 主、谓、宾俱全，从句部分为句子的状语表地点，既可用副词where，又因 in the museum词组，可用介词in + which 引导地点状语。而此题中，介词on 用的不对，所以选A。
关系词的选择依据在从句中所做的成分，先行词在从句中做主、定、宾语时，选择关系代词（who, whom, that, which, whose）； 先行词在从句中做状语时，应选择关系副词 （ where 地点状语，when 时间状语，why 原因状语） 。
限制性和非限制性定语从句
1） 定语从句有限制性和非限制性两种。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。（限制性）
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。（非限制性）
2） 当先行词是专有名词或物主代词和指示代词所修饰时，其后的定语从句通常是非限制性的。例如：
Charles Smith, who was my former teacher, retired last year.
查理史密斯去年退休了，他曾经是我的老师。
My house, which I bought last year, has got a lovely garden.
我去年买的的那幢房子带着个漂亮的花园。
This novel, which I have read three times, is very touching. 这本小说很动人，我已经读了三遍。
3） 非限制性定语从句还能将整个主句作为先行词, 对其进行修饰, 这时从句谓语动词要用第三人称单数。例如：
He seems not to have grasped what I meant, which greatly upsets me.
他似乎没抓住我的意思，这使我心烦。
Liquid water changes to vapor, which is called evaporation. 液态水变为蒸汽，这就叫做蒸发。
说明：关系代词that和关系副词why不能引导非限制性定语从句。
介词+关系词
1）介词后面的关系词不能省略。
2）that前不能有介词。
3）某些在从句中充当时间，地点或原因状语的"介词+关系词"结构可以同关系副词when 和where 互换。例如：
This is the house in which I lived two years ago. 这是我两年前住过的房子。
This is the house where I lived two years ago.
Do you remember the day on which you joined our club? 还记得你加入我们俱乐部的那一天吗？
Do you remember the day when you joined our club?
18.6 as, which 非限定性定语从句
由as, which 引导的非限定性定语从句，as和which可代整个主句，相当于and this或and that。As一般放在句首，which在句中。例如：
As we know, smoking is harmful to one's health. 如我们所知，吸烟有害健康。
The sun heats the earth, which is very important to us. 太阳使地球暖起来，这对我们人类很重要。
初中定语从句的课件 篇3
在句子中起定语作用、修饰句中的名词或代词的.从句称为定语从句，被修饰的名词或代词成为先行词。定语从句由关系代词（which，that，who，whom，whose）或关系副词（when，where，why）引导。
二、 例句
1. The flowers which I grew in the garden last month will bloom soon.
2. The man who telephoned me just now is a writer. This is the place where my mother was born.
三、 关系代词的选择
1. 充当主语的关系代词 关系代词在限定性定语从句中作主语，who 用于人，which用于物，that既可以指人可以指物。
2. 充当宾语的关系代词 关系代词在限制性定语从句中作谓语动词宾语，who ,whom 用于指人，which用于指物。that 既可以指人，也可以指物。在非正式文体中可省略。The suit(which/that) the tailor suited for me doesn’t fit me.
3. 作介词宾语的关系代词 在限制性和非限制性定语从句中，关系代词作介词宾语，whom 用于指人，which用于指物，不能用that. The man with whom you shook hands just now is head of our department.
四、 辨析
常用that 的几种情况
1. 先行词前含形容词最高级、序数词或only作第一文库网修饰语. This is the best film that has ever been made.
2. 先行词前含不定代词，如all ，anything，nothing，little，much等。
That is all (that) I want to say.
3. 先行词为人和物的名词组。
They talked of persons and things that they remembered in the school.
五、 关系副词的选择
When 和 where 可以用于限制和非限制性定语从句中，why只能用于限制性定语从句中。它们在从句中分别作时间、地点和原因状语，其结构相当于“介词+关系代词”.
1. I still remember the day when/on which we firstmet.
2. The city where /in which I was born is on the newrailway line. This is the reason why/for which he left school.
定语从句 练习题
1. The doctor _______ is leaving for Africa next month.
A. the nurse is talking to him
B whom the nurse is talking
C whom the nurse is talking to
D who the nurse is talking
2. I don’t like such a person ____ often lies before your face.
A .what B. that C. as D. which
3. This is the very boy ____ I have been looking for.
A. which B. what C. who D. whom
4. He talked about the people and things ____interested him greatly during his stay here.
A. which B. that C. who D. they
5.(双选) Carmen likes musicians ____play different kinds of music.
A. who B. whom C that D. which
初中定语从句讲解课件 篇4
一、定语从句的概念
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。
二、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）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。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，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。
四、关系代词的用法
1. that 既可以用于指人，也可以用于指物。在从句中作主语或宾语，作主语时不可省略，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.which用于指物，在句中作主语或宾语，作主语不可省略，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。（作主语）
The film （which） we saw last night was wonderful. 我们昨天晚上看的那部电影很好看。（作宾语）
3.who， whom用于指人，who 用作主语，whom用作宾语。在口语中，有时可用who代替whom，也可省略。例如：
The girl who often helps me with my English is from England.经常在英语方面帮助我的那个女孩是英国人。（作主语）
Who is the teacher （whom） Li Ming is talking to？正在与李明谈话的'老师是谁？（作宾语）
注意：（1）当定语从句中含有介词，介词放在句末时，who， that， which可省略，但介词在关系代词前时，只能用介词+which/whom结构。例如：
This is the house in which we lived last year.这是我们去年居住的房子。
Please tell me from whom you borrowed the English novel.请告诉我你从谁那借的这本英文小说。
（2）含有介词的固定动词词组中，介词不可前置，只能放在原来的位置上。例如：
This is the person whom you are looking for. 这就是你要找的那个人。
（3）that 作介词的宾语时，介词不能放它的前面，只能放在从句中动词的后面。例如：
The city that she lives in is very far away.她居住的城市非常远。
（4）关系词只能用that的情况：
a. 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. 他是第一个通过考试的人。
b.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？你在商店里有什么东西要买吗？
c.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.这就是我丢的那辆自行车。
d. 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.我能清楚记得我在那个房间所见到的人和一些照片。
e.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？ 正在哭泣的那个女孩是谁？
f.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. 桌子上那本书是汤姆的。
（5）关系词只能用which，而不用that 的情况：
a.先行词为that， those时，用which， 而不用that.例如：
What’s that which is under the desk？ 在桌子底下的那些东西是什么？
b.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。
c.引导非限制性定语从句，用which， 而不用that.例如：
Tom came back， which made us happy. 汤姆回来了，这使我们很高兴。
五、关系副词的用法
（1）when指时间，其先行词表示时间，在句中作时间状语。例如：
This was the time when he arrived.这是他到达的时间。
（2）where指地点，其先行词表示地点，在句中作地点状语。例如：
This is place where he works.这是他工作的地点。
（3）why 指原因，其先行词是原因，起原因状语作用。例如：
Nobody knows the reason why he is often late for school. 没人知道他为什么上学总迟到。
初中定语从句课件 篇5
一、教学目标
通过本章复习, 使学生明白定语从句的构成和用法。
二、教学重点和难点
限制性定语从句与非限制性定语从句的区别；关系代词与关系副词引导定语从句的不同；介词+关系代词引导定语从句；关系代词who, that, which的用法区别。定语从句与同位语从句及其一些句子结构的区别。
三、教学方法
Teacher
1．什么是定语从句?
2．被定语从句修饰的名词或代词叫先行词。连接先行词与定语从句的引导词叫关系词，其中 which, that, who, whom, whose 这些词叫关系代词，它们在句中用来指人或事物，在定语从句中作主语或宾语，whom 只能作宾语。作宾语时，关系代词可省略。而 when, where, why 这些词是关系副词，他们在句子中用来作状语。（请同学们根据以上所述, 给出一些例句, 用来说明。）
3．以上关系代词在使用时也是有很多区别的。（请同学们看下面的句子, 然后说出使用关系代词 that 的原因。）
A．All that is worth doing should be done well.
B．The only thing that she could do was to ask the police for help.
C．We will never forget the first lesson that our English teacher gave us.
D．What is the smallest thing that can be seen under a microscope?
E．The visitors spoke highly of the children and the performances that they saw.
F．Who is the person that let out the secret?
4．下面讲一下只能用关系代词 which 引导的定语从句。
A．在非限制性定语从句中, 指物时只能用 which 不能用 that。
B．在定语从句中, 介词+关系代词引导定语从句指物时, 只能用 which 不能用 that。
（请同学们给出上面两种情况的例句。）
5．对于“介词+关系代词”引导宾语从句, 如何选介词这个问题, 可归纳为下面几点：
A．根据宾语从句谓语动词的习惯搭配。如：Do you know the man with whom you just shook hands?
（句中的 with 来自习惯搭配 shake hands with）
B．由先行词来决定。如： I'll never forget the day on which I joined the Party.
C．由句子表达的全部意义来确定。如：Water is very important for us without which we can't live.
6．有下面两种情况：
A．先行词 all, any 和 a few 指人时, 如：
Any who breaks the law will be punished.
B．先行词是 this, that, those 或 these 且指人时。
Those who hadn't bought the ticket for the train crowded in the waiting hall.
7．请看下面句子, 然后分析一下：
A．The engineer whose son is in America is very kind.
B．Look at the house whose roof is red.
8．请看下面句子, 然后分析一下：
A．I'll go to any place where people need me.
B．I still remember the day when I joined the army.
C．I don't know the reason why he was late.
9．那么, 表示地点、时间的名词后面都被关系副词引导的定语从句所修饰吗？
10．我们知道 as 也可作为关系代词, 引导定语从句, 包括非限制性定语从句和限制性定语从句, 井且多与 such, the same as 并用。 （请同学们翻译下列的句子。）
A．我们知道, 指南针最早是中国人发明的。
B．这支钢笔和我昨天丢的那支很相似。
C．他们今年生产的钢和去年一样多。
D．我们应该和这样的热心、勤奋的人交朋友。
Students
1．在复合句中，修饰名词或代词的从句称为定语从句被定语从句修饰的名词或代词叫先行词。连接先行词与定语从句的引导词叫关系词，其中 which, that, who, whom 这些词叫关系代词，它们在句中用来指人或事物，在定语从句中作主语或宾语，whom 只能作宾语。作宾语时，关系代词可省略。
2．A．Here is the pen that you lost yesterday. （that 用来指物, 在从句中作宾语, 可以省略掉, that 也可用 which 代替。）
B．The girl who told me the news is not here now. （who 用来指人, 在从句中作主语, that 可以代替 who 用来指人。）
C．The woman who / whom / that you saw in the park is our English teacher. （whom 只能用来指人, 只能作宾语, 在从句中可以省略。）
3．刚才所说的6个句子的宾语从句, 关系代词只能用 that 而不能用其他关系代词, 下面逐个分类分析：
A．先行词是 all, much, little, none, the one 或由 no-, any-, every- 构成的复合代词时。
B．先行词被 all, every, some, little, much, the only, the very 等修饰时。
C．先行词是序数词或被序数词限定时。
D．先行词被形容词最高级修饰时。
E．先行词同时包含人和事物时。
F．当主句是 who 或 which 开头的特殊疑问句时, 为避免重复, 习惯上多用 that。
4．
A．She heard a terrible noise, which brought her heart into her mouth.
非限制性定语从句与主句用逗号隔开, 非限制性定语从句引导词不用that。
B．The games in which the young men competed were difficult.
介词in也可以放在定语从句谓语动词之后, 关系代词which或that可省略。
5．定语从句中, “介词+关系代词”引导定语从句。关系词前选什么样的介词对我们来说有时束手无策, 希望老师能够归纳出几点巧妙的.判断规律。
6．When shall we use the relative pronoun“who”and“whom”?
7．这两句中的定语从句都是由 whose 引导的, 在从句中 whose 只能作定语。
A 句中 whose 修饰人。
B 句中 whose 修饰物, 这个句子相当于：Look at the house the roof of which is red. 或：Look at the house with a red roof.
8．这三个句子中, 所含的定语从句都是由关系副词引导的。
A．where 引导的定语从句修饰一个表地点的名词, where 本身作从句中谓语的地点状语, 这时, where 可由介词 to + which 来替代。
B．when 引导定语从句修饰一个表示时间的名词, when 在从句中作时间状语, when 可用介词 on＋which 来替代。
C．why 引导定语从句修饰一个表示原因的名词, why 在从句中作原因状语。why 可用介词 for + which 来替代。
从以上三个句子来看, 关系副词引导定语从句, 一般情况下, 都可用“介词+关系代词”来替换关系副词。
9．不一定。如果表地点或表时间的名词在定语从句中作主语或宾语, 就不能用关系副词引导宾语从句, 而应由相应的关系代词引导。如：
A．Mike is studying in a school that/which was built in 1928．
B．Those days that / which we spent with Mary were wonderful.
10．
A．As is known to all, the compass was first made in China.
B．This is the same pen as I lost yesterday.
C．They have produced as much iron this year as they did last year.
D．We ought to make friends with such people as kind and hard working.
定语从句初中教学课件 篇6
在复合句中,修饰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,引导定语从句的有关系代词 who, whom, whose, which, that等和关系副词where, when, why等 ，关系代词和关系副词在定语从句中担任句子成份。
1.由who引导的定语从句中 ，who用作主语,如 ： This is the boy who often helps me.
2.由whom引导的定语从句中，whom用作宾语，如：The man whom you are waiting for has gone home.
3.由whose引导的定语从句中 ，whose用作定语,如 ： Do you know the girl whose skirt is white?
4.由which引导的`定语从句中，which用作主语或谓语动词的宾语或介词的宾语，如：
The room in which there is a machine is a work shop.
The river which is in front of my house is very clean.
This is the pen which you want.
注意 ：
(1)whom, which用作介词宾语时,介词可放在 whom、which之前,也可放在从句原来的位置上;但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。如： He is the very person whom we must take good care of.
(2)引导非限制性定语从句时，必须用关系代词which，不用that,如：I have lost
my bag, which I like very much.
(3)关系代词在句中作主语时，从句的谓语动词的人称和数必须和先行词保持一致。
5.由that引导的定语从句中，that可以指人或物，在从句中作主语或谓语动词的宾语，但不能放在介词后面作介词宾语，如：
The book that I bought yesterday was written by Lu Xun.
注意在下面几种情况下必须用 that引导定语从句。
(1)先行词是不定代词all, few, little, much, something, nothing, anything等,如 ：
All that we have to do is to practise English.
(2)先行词被序数词或形容词最高级所修饰，如
The first letter that I got from him will be kept.
(3)先行词被all, any, every, each, few, little, no, some等修饰,如
I've eaten up all the food that you gave me.
(4)先行词被the only, the very, the same, the last修饰时如
He is the only person that I want to talk with.
(5)先行词既有人又有物时，如:
They talked about persons and things that they met.
(6)当句中已有who时,为避免重复,如 ： Who is the man that is giving us the
class?
6.由when, where, why引导的定语从句，如:
I don't know the reason why he was late.
This is the place where we have lived for 5 years.
I'll never forget the day when I met Mr Li for the first time.
注意：先行词是表示地点时，如果从句的谓语动词是及物的，就用 that(which)，如果从句的谓语动词是不及物的，就用where引导。This is the house Which /that he has lived in for 15 years.(Where he has lived for 15 year.)
7. 限制性定语从句和非限制性定语从句
(1)限制性定语从句是句中不可缺少的组成部分，主句和从句之间不用逗号分开。引导非限制性定语从句的关系代词有who, whom, whose, which, of which等，这些关系代词都不能省略。
(2)非限制性定语从句是对主句先行词的补充说明,没有这种从句,不影响主句意思的完整,一般用逗号把主句和从句分开,关系代词用 which,不用that;指人时可用who,如 ： I have two brothers, who are both students.
8.如何简化定语从句
(1).定语从句简化为形容词或形容词短语作后置定语。如:
My grandfather lives in a village that is far away from here.
→My grandfather lives in a village far away from here.我祖父住在离这儿很远的一个村子。
This is a book that is worth reading.
→This is a book worth reading. 这是一本值得看的书。
(2) 定语从句简化为现在分词或现在分词短语作前置或后置定语。
The man who is standing under the tree is our English teacher.
→The man standing under the tree is our English teacher.
站在树下面的那个人是我们的英语老师。
I saw the house that was burning at that time.→I saw the burning house at that time.
当时我看到那房子在燃烧。
(3)定语从句简化为过去分词短语作后置定语。
I like to see the films which are directed by Zhang Yimou.→I like to see the films directed by Zhang Yimou. 我喜欢看张艺谋导演的电影。
She is the girl who was praised at the school meeting.→She is the girl praised at the school meeting. 她就是在校会上受表彰的那个女孩。
(4)定语从句简化为不定式作后置定语。
He is always the first person that comes to school.→He is always the first person to come to school.他总是第一个到校。
The report which will be given tomorrow is important to us.→The report to be given tomorrow is important to us. 明天要作的报告对我们很重要。
(5)定语从句简化为what 从句。
I couldn't remember the words that he said.→I couldn't remember what he said.
我记不得他说的话。
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