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高一英语定语从句课件获奖
导语：下面是我为你分享的高一英语定语从句课件，希望能够为大家带来帮助，希望大家会喜欢。同时也希望给你们带来一些参考的作用，如果喜欢就请继续关注我们的后续更新吧！
[典型例题]
1. Women _______ drink more than two cups of coffee a day have a greater chance of having heart disease than those ________ don’t. (2006 北京 31)
A. who; 不填 B. 不填; who C. who; who D. 不填表; 不填
解析：考查关系代词who引导的定语从句。这两个定语从句的先行词都是指人，在第一个定语从句中引导词作主语，可以用who或that；在第二个定语从句中，引导词作主语，同时，先行词又是those，引导词应该用who，所以选C项。
2. We saw several natives advancing towards our party, and one of them came up to us, _______ we gave some bells and glasses. (2006 湖南 30)
A. to which B. to whom C. with whom D. with which
解析：考查“介词+whom”引导的定语从句。根据前面的one of them可以知道先行词是人，可以排除A和D项。表示“给某人某物”用词组“give sth. to sb.”，引导词中应该用to，所以选B项。
3. We’re just trying to teach a point ____ both sides will sit down together and talk. (2006山东 26)
A. where B. that C. when D. which
解析：考查关系副词where引导的定语从句。定语从句的先行词是表示地点的名词point，用where强调一个特定的地点，相当于at the point，在从句中作状语，所以选A项。
[语法讲解]
定语从句也称为形容词性从句，由关系代词或关系副词引导，从句中的关系词除了具有引导作用外，还指代前面的先行词，并且在从句中担当一定的成分。根据关系词的性质，可以分为由关系代词、关系副词、准关系代词、复合关系代词引导的定语从句。
1）关系代词可以在定语从句中作主语
注意：关系代词在定语从句中做主语时，从句谓语动词的人称和数要与先行词保持一致。例如：The man dressed in black is the doctor who has operated on the seriously wounded man.
穿着黑衣服的那个人就是给那位严重受伤的病人做过手术的医生。
2）关系代词可以在定语从句中作宾语
注意：a) 在非正式文体的限制性定语从句中，用作宾语的关系代词whom, who, that和which通常可以省略。例如：That is the man (who/whom/that) I met in London last year.他就是我去年在伦敦碰见的人。
b) 关系代词作前置介词的短语时，只能用whom指人，which指物；但是当介词后置时，就没有这种限制。
例如：The person to whom I complained is the manager.我向他投诉的那个人是经理。
The hotel which/that we stayed at was rather comfortable.我们住的那家旅馆相当舒服。
注意：在表示时间、地点和原因的限制性及非限制性定语从句当中，关系副词when, where和why可以用来代替“介词+关系代词”，在从句中只能作状语。
[常见考点]
1．定语从句中只用that作为关系词引导的情况：
a) 当先行词被一个最高级形容词修饰时，必须用that。例如：That is one of the most exciting football games that I have ever watched.那是我所看过的最激动人心的一场足球比赛。
b) 当先行词被序数词修饰时，必须用that。例如：The ninth plane that landed at the airport was from the USA.第九架降落在该机场的飞机来自美国。
c) 当先行词被限定词 (the) very, (the) last, (the) only, the same, one, single, no, (a) little, (a) few, many, much, none, some, any, every, all等修饰时，必须用that。例如：This is the very pen that Mark Twain used when he was writing the novel.这正是马克·吐温写那部小说时用过的笔。
d) 当先行词为不定代词all, anything, everything, nothing, something等时，必须用that。例如：All that is needed now is a continuous supply of the necessities of life.现在所需要的是持续地供应生活必需品。 e) 当先行词是指人、指物的两个并列名词时，必须用that。例如：
You can see a horseman and his horse that are crossing the flyover during the parade.
旅游期间你可以看见骑手和马穿国天桥。
f) 当关系代词在定语从句中作表语时，必须用that，that可以指人、指物，但是往往被省略。
例如：The modern airplane is not the machine that it was when first invented.
现代的飞机不是刚发明时的那种飞机了。
g) 当定语从句为there be结构时，在从句中做主语的关系代词只能是that，that往往被省略。
例如：The number of mistake that there are in this homework is simply surprising.
这份家庭作业中的错误简直多得惊人。
h) 当先行词是who或what，而且后面跟定语从句时，只能用that。
例如：Who that works a great deal with a plane does not know about the engineer?
常和飞机打交道的人中，谁不了解那个工程师？
2．定语从句中只用which作为关系词引导的情况：
a) 当先行词为that时，只能用which指物。例如：
I use the word not in the present sense, but in that which was held in the nineteenth century.
我用这个词不是它当今的意思，而是取其19世纪的意思。
b) 在非限制性定语从句中，只能用which指物。例如：These apple trees, which I planted three years ago, have not yet borne any fruit.这些苹果树是我三年前栽下的，尚未结果实。
c) 当与介词一起作为关系代词引导从句时，只能用which指物。例如：They tried to think of a method by which they could solve the problem.他们要尽力想出一个能够解决问题的办法。
3．定语从句中只用who作为关系词引导的情况：
a) 当先行词是everyone, everybody, someone, somebody, anyone, anybody时，关系代词要用who或whom。例如：Is there anyone who can answer this question?有谁能回答这个问题吗？
b) 当先行词是those或all时，关系代词必须用who。例如：Those who want to go on the trip should put on their names on the list.想去旅游的人应该在名单上写上自己的名字。
Tom is shining example to all who want to be a successful. Tom对所有想成功的人来说是一个光辉的形象
c) 当先行词特指意义较强时，关系代词通常用who。例如：The man who was killed in the car accident yesterday was his brother.昨天在车祸中死去的那个人是他的兄弟。
d) 当指人的先行词被其它成分隔开时，关系代词通常用who。例如：There is one student in the school who I can see.在这个学校里我只见到了一个学生。
[实战演练]
1．改正下列句子中的错误
(1) There are many organizations which sole purpose is to help mentally retarded children.
(2) The period during when people learned to smelt iron is called the Iron Age.
(3) Nobody believed his reason for being late why his car broke down on the way.
(4) They tried to think out a plan that they could complete their task ahead of time.
(5) As we know it, the telephone was the invention of Alexander Graham Bell.
(6) Many of our Welsh people are going to settle in North Carolina, which land is cheap.
(7) There are not many people in this city which own the houses they live in.
(8) The reason why I want to take this lesson is that the professor is supposed to be very eloquent.
(9) The goal with which he had fought all his life no longer seemed important to him.
(10) The day is bound to come that all the people in the world shall live in peace.
Keys: 1. which→whose 2. when→which 3. why→that 4. that→by which 5. 去掉it 6. which→where 7. which→who 8. that→because 9. with→for 10. that→when
2．从下列各项中选出最适合题意的选项
(1) _______ is our belief that improvements in health care will lead to a stronger, more prosperous economy.
(2006 浙江 4)
A. As B. That C. This D. It
(2) Nobody believed his reason for being absent form the class ______ he had to meet his uncle at the air port. (2006 重庆 33)
A. why B. that C. where D. because
(3) —— Do you have anything to say for yourselves?
—— Yes，there's one point ______ we must insist on. (2006 江西 33)
A．why B．where C．how D．/
(4) I have many friends, some are businessmen. (2005 全国卷Ⅰ24)
A．of them B．from which C．who of D．of whom
(5) I walked in our garden, _______ Tom and Jim were tying a big sign onto one of the trees. (2005 辽宁 28)
A．which B．when
C．where D．that
(6) — why does she always ask you for help?
— there is no one else ______, is there? (2005 北京 35)
A. who to turn to B. she can turn to C. for whom to turn D. for her to turn
(7) He transplanted the little tree to the garden _______ it was the best time for it. (2005 上海 34)
A. where B. when C. that D. until
(8) Danby left word with my secretary ______ he would call again in the afternoon. (2005 浙江 15)
A. who B. that C. as D. which
(9) — Did Jack come back early last night?
—Yes. It was not yet eight o’clock he arrived home. (2005 福建 24) A．before B．when C．that D．until
(10) The place _______ the bridge is supposed to be built should be________the cross-river traffic is the heaviest. (2005 江苏 32)
A. which; where B. at which; which
C. at which; where D. which; in which
Keys: 1-5 ABDDC 6-10 BBBBC
定语从句趣味公开课游戏
定语从句公开课教案 篇1
Teaching Aims:(教学目的)
1、初步了解定语从句的概念、结构。
2、初步学习并掌握定语从句的规则，尤其是关系代词『who，which，that以及whose』的用法。
Teaching Points:(教学重点)
1.定语从句三要素及关系词的选用
2.只能that或which的情况;
Teaching Methods:(教学方法)
1、举例讲解，说明定语从句的用法。
2、以讲练结合的方法加深学生印象。
Teaching Steps:(教学步骤)
Step1.导入
一、定语及定语从句的概念：
a beautiful girl a handsome boy a clever child
1、 定语是用来修饰名次或代词的。
This is the boy who is clever.
2、定语从句(Attributive Clauses)定义：在主从复合句中修饰名词或代词的从句 定语从句的特点：
定语从句
的引导词关系代词where (地点状语)关系副词
when (时间状语)
why (原因状语)
Step2:详细讲解定语从句语法知识
1、who和whom指人，在从句中分别做主语和宾语，做宾语时可被省略。
the handsome
the tall
the strong boy The boy is Tom.
the clever
the naughty
The boy is Tom.
2、which指物，在从句中做主语或宾语，做宾语时可被省略。
3、that既可指人也可指物，在从句中做主语或宾语，做宾语时可被省略。
4、whose作定语，用来表示先行词和从句主语之间的所属关系。
Step3 定语从句考查重点：
定语从句在下列情况下只能用that，而不能用which指物。(指人时可以用who/whom)
1. 当先行词被形容词最高级修饰时。如：
2. 当先行词是不定代词everything, anything, nothing (something 除外), all, none, few, little, some等代词时，或当先行词受every, any, all, some, no, little, few, much等代词修饰时。如：
3. 当先行词被序数词修饰时。如：
4. 当先行词被表示“正是”的the very, the only修饰时。如：
5. 当先行词前面有who, which等疑问代词时。如：
6. 当先行词为人与动物或人与物时。如：
Step 4 Summary:(小结) 注意 关系词的实质：
Step 5 Practices(homework):
Part 1.结合课文例句，找出先行词和关系词
1. But the one million people of the city, who thought little of these events, went to bed as usual that nigh.
2. It was heard in Beijing, which is one hundred kilometers away.
3. A huge crack that was eight kilometers long and thirty metres wide cut across houses, roads and canals.
4. The number of people who were killed or injured reached more than 400,000.
5. The army organized teams to dig out those who were trapped and to bury the dead.
6. Workers built shelters for survivors whose homes had been destroyed.
Part2 名言名句欣赏
1. He laughs best who laughs last.
2. He who makes no mistakes makes nothing.
3. He that gains time gains all things.
4. He who nothing questions, nothing learns.
5. He that cannot ask cannot live.
6. A friend is someone who knows all about you and still loves you.
7. God helps those who help themselves.
8. He who does not reach the Great Wall is not a true man
9. He who does not advance loses ground.
Part3 practice
1. Do you know the girl _____ is talking with your mother?
A. who B. which C. whose D. /
2. This is the kite _______ Billy Fisher gave to Tom
A. who B. which C. / D. Both B and C
3. He was the only one ______ was saved in the earthquake.
A. who B. that C. which D. A and B
4. This is the only present _____ I like.
A. who B. that C. which D. B and C
5. This is the most beautiful place ______ I have ever seen.
A. which B. who C. where D. /
6. All _______ I can do is to give him some money.
A. that B. which C. who D. what
7. Is there anything else _____ you need?
A. which B. that C. who D. what
8. The museum _____ we visited last week isn’t far from here.
A. where B. which C. what D. who
9. Most of the people ____ lost their lives in the earthquake are Sichuan natives.
A. when B. who C. how D. which
10. The boy ____ you saw just now is Tom’s brother.
A. which B. whose C. when D. /
11. The bike and its rider _____ had run over an old woman were helped up by the policeman.
A. which B. that C. it D. whom
12. Is this the factory _____ you worked five years ago?
A. in which B. in where C. in that D. that
二、用适当的关系代词填空
1. Do you like the present _______ I bought you yesterday?
2. The storybook _______ was written by his uncle is quite interesting.
3. The boy _______ computer doesn’t work well needs your help.
4. This is the best movie _______ we have seen this year.
5. The doctor _______ we met in the street is from America.
6. The passengers and the suitcases _____ were in the waiting room had to wait for another plane.
7. Who is the girl _______ you want to make friends with?
8. This is the last lesson _______ Mr. Smith taught us.
9. I, _____ am your friend, will help you out.
10. The building ___________ wall is white is my uncle’s house.
11. The boy _______ John spoke with is my brother.
12. Will you please lend me the very picture _________ you bought yesterday?
13. The students ________ the teacher praised at the class meeting is our monitor.
14. The season _________ comes after spring is summer.
15. This is the first museum __________ we visited last Saturday.
16. The girl ________ leg was broken in the earthquake was taken to the hospital.
17. I found some photos of interesting places _________ were not far away from our city.
18. There is a boy downstairs _________ want to see you.
19. The river ________ banks are covered with trees is very long.
20. I’m going to meet Tom ______ they say is a good boy.
定语从句公开课教案 篇2
一、所需课件： 一课时
学习内容：定语从句中关系代词who, whom ,which ,that ,as的用法。
定语从句是一个很重要的语法项目，为以后的英语学习打下坚定的基础，也是初高考出现频率较高的考点。
二．教学目标分析
知识与目标分析
知识与技能目标：帮助学生掌握关系代词who, whom, which, that, as 的用法，丰富学生的语法知识，形成独立的学习能力，能够运用这些知识去解决定语从句的习题。
过程与方法目标：让学生主动参与感知——积累——理解关系代词的过程，让学生学会关系代词的用法，学会探究解决问题。
情感态度价值观目标：让学生体验到学习定语从句的乐趣。
三．学习者特征分析
初中生刚刚接触与从句，对句子结构认识不够清楚，但是这部分内容很重要，有助于学生完善整个英语语法知识结构。
四．教学策略选择与设计
本课题主要采用启发式教学策略，合作学习，探究学习的策略，在教学中，创设问题情景，以小组为单位进行讨论，合作学习，得出结论。
五．教学资源与工具设计
多媒体教室 计算机 PPT课件
六、教学过程
第一步:复习（检查作业）
第二步：导入
Marry is a beautiful girl.
Marry is a girl who has long hair.
……（讨论句子特征 ）
老师总结：什么是定语从句，先行词，引出定语从句由关系代词，关系副词来引导。
第三步：介绍引导定语从句的关系代词。
第四步：详细介绍这些关系代词的用法。
第五步：习题（加深印象）
第六步：课后总结
第七步：布置作业
七、教学评价设计
创建量规，向学生展示他们将被如何评价（来自教师和小组其他成员的评价）。另外，可以创建一个自我评价表，这样学生可以用它对自己的学习进行评价。
八、帮助和总结
教师以启发诱导的方式向学生提供帮助和指导，针对不同的'学习间断的学生采取不同的`帮助和指导，之处不同水平的要求，给予不同的帮助。对于学习能力强的可以以暗示的方式进行指示，对学习能力差的学生可以通过逐步深入的方式进行讨论。
在学习结束后，对学生的学习做出简单的总结，可以布置一些练习题，以强化学习效果。
【拓展内容】
定语从句关系分类
关系从句有限制性关系从句（英语：restrictive relative clause或defining relative clause）和非限制性关系从句（英语：non-restrictive relative clause）之分。限制性关系从句起限定作用，修饰特定的名词或名词短语；而非限制性关系从句只起补充说明某种信息的作用。
例如：The government which promises to cut taxes will be popular.（限制性关系从句，指任何一个减税的政府）
The government, which promises to cut taxes, will be popular. （非限制性关系从句，补充说明（现任的）政府的情况）
There were very few passengers who escaped without serious injury. （限制性关系从句，指逃出来的乘客大多受了伤）
There were very few passengers, who escaped without serious injury. （非限制性关系从句，指游客人数本来就很少，这些游客都逃了出来且没有受伤）
限制性关系从句
从语义上看，限制性关系从句主要起限定作用，修饰特定的人或事物，如果去掉限制性定语从句，整个句子表意会不完整甚至不通顺；从结构上看，限制性关系从句常紧跟先行词，并且同先行词之间一般不加逗号分隔（但不是绝对的）。
限制性关系从句的关系词包括：that, which, who, whom, whose, as, than等。
非限制性关系从句
从语义上看，非限制性关系从句主要起补充说明的作用，有时相当于一个并列分句或状语从句，可以表达原因、目的、结果、条件、让步等意义。
例如：Dr Lee, who had read through the instructions carefully before doing his experiments, did not obtain satisfactory results. （非限制性关系从句表示让步的意义，相当于though Dr Lee had read through the instructions...）
非限制性定语从句的关系词包括：which, who, whom, whose, as等，另外that在非限制性关系从句中并非绝对不可使用。
关系选择
关系词包括关系代词（英语：relative pronoun）、关系副词（英语：relative adverb）和关系限定词（英语：relative determiner）。关系词的选择主要涉及以下因素：
1.先行词是人还是事物；
2.关系词在关系从句中的句法功能；
3.关系从句是限制性的还是非限制性的；
4.是口语还是书面语。
特殊的关系从句
名词性关系从句
名词性关系从句（英语：nominal relative clause）又叫自由关系从句（英语：free relative clause），名词性关系从句在结构上不含有先行词，它的关系词同时扮演了关系词和先行词的角色，因此名词性关系从句的关系词又叫缩合连接代词。例如：
I like what I see.（“what I see”是名词性关系从句，它没有先行词，与此同时缩合连接代词“what”又直接充当了“like”的宾语。）
缩合连接代词“what”可以根据语义解释为“the thing(s) that”或“the person(s) that”。
嵌入式关系从句
嵌入式关系从句（英语：embedded relative clause）是一种较复杂的关系从句，它既是先行词的后置定语，又是另一结构的宾语。
例如：She has an adopted child who she says was an orphan. （关系从句修饰“an adopted child"，同时又是“she says”的宾语）
双重关系从句
双重关系从句（英语：double relative clause）是指两个关系从句修饰同一个先行词的语法现象。
例如：You can easily find us;just look for a house whose windows need washing and whose fence needs repairing!
高一英语必修一unit4定语从句教案
下面是我整理的高一英语定语从句教案，欢迎阅读。
一、定语从句及相关术语
定语从句：在主从复合句中，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。关系词：引导定语从句的关联词称为关系词，关系词有关系代词和关系副词。
请看示例：1、The woman who lives next door is a teacher. 2、An architect is a person who designs buildings. 3、I do not like stories which have unhappy endings.
二、关系词功能及用法：
关系代词有that, which, who, whom, whose, 等;关系副词有where, when, why等。关系词常有3个作用： ①连接作用，引导定语从句。 ②代替主句中的先行词，甚至可能是主句中的一部分或者整个主句。 ③在定语从句中充当一句子成分。
三、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。
注意事项：that在从句中作主语或宾语，既可以指人又可以指物;which在从句中作主语或是宾语，只能指物;who，whom在从句中分别作主语或宾语，只能指人;whose为关系代词who的所有格形式，用作名词的限定语，whose引导的定语从句既可以是限制性的，也可以为非限制性的。先行词既可以是人，也可以是物，whose和它所修饰的名词在定语从句中可作主语及动词或介词的宾语。
1)who, whom, that
这些词代替的先行词是指人的名词或代词，在从句中所起作用如下：
Is he the man who/that wants to see you?他就是想见你的人吗?(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)
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)
2)which, that
它们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在句中作主语)
The film (which / that) we saw last night was wonderful. 我们昨天晚上看的那部电影很好看。(which / that在句中作宾语)
3) 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
练习：
1. This is the bag _____ my mother bought yesterday.
A. that B. who C. whom D. this
2. The man _____ lives next to us is my English teacher.
A. whom B. which C. who D. whose
3. The girl _____ you saw in the street is Mary.
A. that B. whose C. which D. her
4. The language _____ is easy to learn is the mother tongue.
A. which B. that C. / D. it
5. _____ cleans the blackboard should be praised.
A. That B. Who C. The one who D. The students who
6. Please show me the book _____ you bought yesterday.
Please show me the book _____ cover is green.
A. which B. whom C. whose D. this
7. Is this the factory _____ a lot of students visited yesterday?
A. the one B. which C. who D. whom
四：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。
关系副词when在从句中作时间状语, where在从句中作地点状语, why在从句中作原因状语。 例如：
I will never forget the time when we worked on the farm.
The hotel where we stayed wasn’t very clean.
I did not get a pay rise, but this was not the reason why I left.
Is this the reason why he refused our offer? 这就是他拒绝我们帮助他的理由吗?
练习：
1. This is the school _____ Mr. Smith once taught.
A. in that B. when C. where D. there
2. Have you visited the house _____ the famous scientist was born?
A. where B. in that C. that D. which
3. The factory _____ Mr. Li used to work was closed last week.
A. when B. where C. that D. which
4. Do you still remember the day _____ we first met?
A. that B. when C. what D. on that
5. The time _____ we studied together is not easily forgotten.
A. when B. that C. where D. in which
6. October 1,1949 was the day _____ the People’s Republic of China was founded.
A. which B. when C. where D. in which
注意： 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.
I'll never forget the days when I worked together with you.
判断改错(注：先显示题，再显示答案，横线;用不同的颜色表示出。)
(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) 。
1. I still remember/will never forget the days ________ we studied/lived together//worked day and night to support the whole family.
A) which B) in which C) on that D) on which E) in that
1. I still remember/will never forget the days ________ we spent together.
A) which B) in which C) on that D) on which E) in that
2. I still remember/will never forget the day ________ I first came to the college.
A) which B) in which C) on that D) on which E) in that
4. I still remember the day ________ we first met on.
A) which B) in which C) on that D) on which E) in that
高一定语从句教案英文版
导语：本文章的主要是关于高一定语从句教案参考，欢迎您来阅读并提出宝贵意见！
Ⅰ. 定义
定语从句，起形容词的作用，在句中常用来修饰名词或代词。被修饰的词称为先行词,引导定语从句的词称为关系词, 关系词的作用一是放在先行词与定语从句中间起引导作用;二是在意义上代替先行词,并在从句中充当一个成分。其中关系代词：who, whom, whose, which, that, as；关系副词：when, where, why。
eg. She is the girl who sings best of all.
The pen which my uncle gave me is missing.
He lives in a house whose windows face south.
The factory where my father works is in the east of the city.
Perhaps the day will come when people will be able to breathe clean air in cities.
Ⅱ. 关系代词
1.先行词是人，作主语，关系代词用who, that
eg. He is a man（ ） never leaves today’s work till tomorrow.
The boy ( ) is standing there is my cousin.
2. 先行词是人，作宾语，关系代词用 whom, who, that,
eg. Here is the man ( ) you’ve been expecting to meet.
The man ( ) you met yesterday is Mr. Smith.
3. 先行词是物，作主语，关系代词用which, that
eg . The train （ ） has just left is for Guangzhou.
Children like to read books ( ) have wonderful pictures.
4. 先行词是物，作宾语，关系代词用which, that,或省略
eg. The book ( ) you borrowed yesterday is really interesting.
The pen ( ) my uncle gave me is missing.
5. 先行词是人、物，作定语，关系代词用whose
eg. He is the professor ( ) name was Jackson.
China, （ ） population is the largest in the world, is developing very fast.
Ⅲ. 关系副词
1.先行词是表示时间的名词，在定从中作时间状语，关系代词用when
eg. I can’t remember the date ( ) he went abroad.
I’ll never forget the day ( ) I joined the army.
2.先行词是表示地点的名词，在定从中作地点状语，关系代词用where; 其中注意表示抽象概念的地点名词，如，situation、stage、degree、point等表示方面或程度时，也需用where
eg. This is the village （ ） Uncle Wang once lived.
They have reached the point ( ) they have to separate with each other.
He’s got himself into a dangerous situation ( ) he is likely to lose control over the plane.
3. 先行词是reason，在定从中作原因状语，关系代词用why
eg. I don’t know the reason ( ) he was late.
None of us know the reason ( ) Tom was absent from the meeting.
4.引导定语从句的关系副词也可以用“适当介词 + which”来代替。
eg. October 1, 1949 was the day when （ = ） the People’s Republic of China was founded.
This is the factory where（= ） we worked a year ago.
I don’t believe the reason why (= ) he was late for school.
Ⅳ. 关系代词that & which的区别:
⒈ 只用that的情况
① 先行词为all, everything, anything, nothing, little, much等不定代词时。
eg. There is nothing ( ) can prevent him from doing it.
② 先行词被any, only, few, no, very, little 等修饰时。
eg. This is the very book ( ) I’m looking for.
③ 先行词被形容词最高级或序数词修饰时。
eg. The first place ( ) they visited in Guilin was Elephant Trunk Hill.
This is the best film ( ) I have ever seen.
④ 先行词既有人又有物时。
eg. He talked about things and persons ( ) they remembered in the school.
⑤ 先行词被the only, the very修饰时。
eg. Mr. Smith is the only foreigner ( ) he knows.
⑥ 句中已有who或which,为了避免重复时。
eg. Who is the man ( ) is standing beside Tom?
⒉ 不能用 that的情况：
① 引导非限制性定语从句；
eg. He had failed in the maths exam , ( ) made his father very angry.
② 介词 + 关系代词。
eg. This is the room in（ ） my father lived last year.
Ⅴ. as引导定语从句时的用法(as 相当于that & which)
① as引导限制性定语从句通常用于the same … as, such … as结构中。
eg. This is the same book ( ) I lent you.
Such machines ( ) are used in our workshop are made in China.
② as引导非限制性定语从句既可放在主句之前，也可放在主句之后，位置灵活，用来修饰整个句子。通常用下列句型：as is known to all, as is said, as is reported, as is announced, as we all know, as I expect 等。
eg. ( ) I expected, he got the first place again in this mid-term examination.
( ) we all know, belongs to China.
Ⅵ. 限制性定语从句和非限制性定语从句的主要区别:
限制性定语从句: 一般紧跟在先行词后面,不用逗号把从句与先行词分隔开来。使先行词的`意思十分明确,成为特定的人或物,是句子中不可缺少的成分,少了它句子就会失去意义不能成立,或意思不清楚,不能说明问题。通常译为定语。
非限制性定语从句: 通常由逗号与句子其他成分隔开。只是对先行词作进一步的说明,没有它句子仍能成立,意思仍很清楚。通常译为并列的句子。
eg. I was the only person in our office （ ） was invited.（去掉定语从句，意思就不完整）
Tom’s father, （ ） is over sixty, still works hard day and night.（整个句子可分成两句来翻译）
Ⅶ. 分隔定语从句
即先行词与关系代词、副词之间被介词短语，同位语，谓语等分隔开来。
此种定语从句，在选择关系词时，要注意找准先行词。
eg. There is an expression in his eyes （ ）I can’t understand.
I was the only person in my office ( ) was invited to the important ball.
I suggest you choose someone I think ( ) is very kind and friendly.
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