红桃小K子
1、This is an old computer which works much slower.2、They stayed with me for three weeks during which time they drunk all the wine I had.3、The picture we are looking at was drawn by a fifteen-year-old student.定语从句（也称关系从句、形容词性从句），是指一类由关系词引导的从句，因为这类从句的句法功能多是做定语，所以曾被称为定语从句，这类从句除了可以做定语之外，还可以充当状语等其他成分，所以现代语言学多使用“关系从句”这一术语。在英语中，定语从句主要通过关系代名词法构成。
旷野和风
同志，语法只要了解个大概就好了，就是上课老师说的，你做的笔记，你只要大概懂就好了，我们学英语主要是为了口语，要会说，还有就是，说实在的，考试的时候，考到语法的可能性不大， 你在精也没用的，只有一两道的
Rachelkeikei
1. This is an old computer which\that works much slower.2. They stayed with me for three weeks during which time they drunk all the wine I had.3. The picture (that) we are looking at was drawn by a fifteen-year-old student.4. The picture at which we are looking was drawn by a fifteen-year-old student.5. I have many students to whom I am going to send postcards.6. You’re the only one whose advice he might listen to.7. I’d like a room whose window looks out over the sea.8. The explorer took only such men and things as he really needed into the jungle.9. Such people as have made great contributions to the world should be greatly respected.10. Let’s meet at the same place as we did yesterday.
爱多肉的milk
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。
【典型例句解析】
例 1 The second book ______I want to read is Business @ the Speed of Thought.
A. which B. what C. that D. as
解析 先行词 book被序数词修饰时要用that引导定语从句，故选C。
例 2 I'll never forget the days _____I stayed with you.
A. when B. in which C. that D. for which
解析 本题指时间，故选 A。
例 3 The book______ is sold out at the moment.
A. you need B. what you need
C. which you need it D. that you need it
解析 B、C、D中的what和it与先行The book相抵触 ， 故选 A。
例 4 Is this the place ______Lincoln once lived.
A. that B. which C. where D. when
解析 本题指地点，故选 C。
例 5 I'm one of the boys _________ never late for school.
A. that is B. who are C. who am D. who is
解析 本题中 who用作主语，谓语动词与先行词the boys保持一致，故选B。
【选讲例句】
例 6 Her sister,______ you met at my home, was a teacher of English.
A. whom B. that C. which D. who is
解析 非限制性定语从句中 ， 关系代词用 which,不用that,但指人时用who或whom.故选A。
例 7 These book are for students _____ mother language is not English.
A. of whom B. that C. which D. whose
解析 whose引导的定语从句中,whose用作定语，故选D。
定语从句that的例句
1. He is a good boy. 形容词作定语
2. Two boys need two pens. 数词作定语
3. His son needs Tom's pen. 形容词性物主代词或名词所有格作定语
4. The boy in blue is Tom. 介词短语作定语
5.There is a woman doctor. 名词作定语
6. The boy there needs a bike. 副词作定语
7.There is nothing to do today. 不定式作定语
8. The smiling boy needs a friend. 现在分词作定语
9. A boy called Tom saved the girl. 过去分词(短语)作定语
10. He is the man that I met yesterday. 定语从句
一、定语从句的概念：在复合句中，用作定语的从句叫做定语从句。
二、定语从句的位置：通常位于它所修饰的名词或代词之后。
三、被修饰的名词或代词叫做先行词。
四、引导定语从句的关联词为关系代词和关系副词。关系代词(who, whom, whose, that, which等)在定语从句中可用作主语、定语、宾语等;关系副词(when, where, why等)在定语从句中只用作状语。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。
五、定从基本形式：先行词(名词/代词) + 关系代词/关系副词+ 定从
六、that引导的定语从句
She is the girl that talked to you yesterday. (that作主语)
The coat (that) I put on the desk is blue. (that作宾语)
结论：that引导的定语从句既可以修饰人，也可以修饰物;
that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：
1. I like music. I can dance to music.
I like music that I can dance to. (that在从句中用作宾语。)
2. I prefer a sandwich. A sandwich is really delicious.
I prefer a sandwich that is really delicious.(that在从句中用作主语。)
注意：that在定语从句中作主语时，定语从句中谓语动词的单复数应与先行词保持一致.
例如：I prefer movies that are scary.
I like a sandwich that is really delicious.
I love the singer that is beautiful.
I have a friend that plays sports.
1. A miracle is something that seems impossible but happens anyway.
奇迹就是看似不可能，却发生了。
2. If you wait, all that happens is that you get older.
如果你等待，发生的只有变老。
3. When life gets hard and you want to give up, remember that life is full of ups and downs, and without the downs, the ups would mean nothing.
当生活很艰难，你想要放弃的时候，请记住，生活充满了起起落落，如果没有低谷，那站在高处也失去了意义。
4. Eventually, you'll learn to cry that on the inside.
终有一天，你会学会让泪往心里流。
5. Success is not final, failure is not fatal: it is the courage to continue thatcounts.--Winston Churchill
成功不是终点，失败也并非末日，最重要的是继续前进的勇气。
chetcn0948
I'll tell you about it when we meet .我们见面时，我会告诉你有关情况的。As he was carrying out the experiment , he found something abnormal .正当他在做试验时，他发现情况有些不常。Please eat it while it is hot .请趁热吃。It has been more than two years since we parted last time .自我们上次分手至今已有两年多了。Tom will tell him the truth when he comes back .他回来时，汤姆会告诉他事实真相的。He will not play football if it rains tomorrow .明天要是下雨，他就不踢足球了。Tom would tell him the truth when he came back . 他回来时，汤姆会告诉他事实真相的。He would not play football if it rained the next day . 次日要是下雨，他就不踢足球了While she was watching TV , she was cracking seeds .她一边看电视一边磕瓜子。As he was doing his packing , some of his friends came to say good-bye to him .正当他在收拾行装的时候，他的一些朋友来向他告别。They were ready to go out when the telephone rang .（这个句子表示主句谓语动作rang发生的突然性。按常规应该是：When they were ready to go out , the telephone rang .）就在他们准备出去的时候，电话铃响了。He didn't go to sleep until 12 last night . 他昨晚直到十二点钟才睡觉。They didn't realize their fault till we pointed it out to them .直到我们向他们指出了他们的错误，他们才意识到。Not until we pointed out their fault to them did they realize it .直到我们向他们指出了他们的错误，他们才意识到。The students made much noise till the teacher came into the classroom .直到老师走进教室学生们才停止了大声喧哗。The young couple were very happy until they used up all their money .那对年青夫妇直到花光了所有的钱才沮丧起来。I may not come to see you recently unless I can complete the project ahead of time .除非我能提前完成那个项目，否则我最近不会来看你了。或者：除非我能提前完成那个项目，我最近才会来看你了。We can surely attain our goal as long as we are united as one .只要我们团结成一个人，我们肯定能实现我们的目标。What shall we do if we can not get the necessary data？如果我们弄不到必要的数据，我们怎么办？They promised to let us have a meeting in their office on condition (that) we could keep it clean . 如果我们能保持清洁，他们答应让我们在他们的办公室里开会。He can't deliver his lectures today because he has got a bad cold .他今天不能去讲课了，因为他患了重感冒。I may not be able to attend your wedding party not because I'm not willing to but because I've been caught by something recently.我或许无法参加你的婚礼了，不是我不想去而是近来有些事情缠着我无法脱身。I won't dwelt too much time on this matter as it is known to everybody.由于大家都知道这件事，我就不在这件事上多花时间了。Since you are busy enough we won't trouble you any more .既然你们忙得够呛，我们就不再麻烦你们了。Because it is raining heavily, we have to change our plan to go outing.现在下着这么大的雨，我们不得不改变去郊游的计划。As the weather was fine, we decided to climb up the mountain. 由于天气晴朗，我们决定去登山。She is loved by all for she is kind and pretty . 由于她长得漂亮、人又好而深受大家喜欢。Air exists everywhere although we can't see it.尽管我们看不见空气，但它却无处不存在。No matter where you go on the earth, you will feel the gravity.无论你走到地球的什么地方，你都会感觉到地引力。We'll start our meeting on time whether he comes or not. 无论他来不来，我们将准时开会。Even if we are approaching the end of the experiment, we still have no time to lose.即使我们即将完成试验，我们依然要分秒必Although he is old, he is still energetic .（主从复合句，正确） 尽管他上了年纪却还是依然精力充沛He is old but (he is) still energetic . （并列句，正确）尽管他上了年纪却还是依然精力充沛He speaks English almost as a native speaker does .他的英文几乎说得如讲英语母语的人一样。He speaks English as if he were a native speaker .他讲英文的样子似乎象说英语母语的人。She looked unwell as though she got a bad cold .她看上去身体不适好像患有重感冒。In this reading-room you can read anything as everyone does here .在这间阅览室里，你可以象这儿的每个人一样想看什么就看什么。
