中医内科学第七班:定语从句 请详细的讲讲 最好有例题

摘自《简明英语语法》

在英文中，有两种定语从句：限定性定语从句与非限定性定语从句。这两种定语从句在其功能和形式方面都有明显的区别：
限定性定语从句限定性定语从句与主句的关系很紧奏，对其先行词起限定、修饰的作用。如果将其去掉，会影响句子意思的完整性；有时甚至于引起费解、误解。例如：
Rainforests are being cleared for valuable timber and other resources to speed up the economic growth of the nationsin which they are located .
为了加速他们各自所在国家的经济发展，热带雨林作为有价值的原木和其他资源正为人们所砍伐。
Ocean currents affect the climates of the lands near which they flow.
洋流影响其流经的附近地区的气候。
They explained the reason to us why they had hated us before.
他们向我们解释为什么他们不喜欢我们的原因。

非限定性定语从句非限定性定语从句在形式上就与主句很松散，它与主句之间有一个逗点"，"隔开；它对其先行词没有限定、修饰的作用，只起补充、说明的作用。有时也用它来对全句进行补充、说明。即使将其去掉，也不会影响句子意思。由于上述原因，非限定性定语从句在表达意思方面也有别于限定性定语从句。另外，非限定性定语从句在中文译文里，我们往往将其作为一个分句处理，而不把它作定语翻译。 例如：Earlier , the Babylonians had attempted to map the world , but they presented it in the form of a flattened disc rather than a sphere , which was the form adopted by Ptolemy .
（此句中，非限定性定语从句是对先行词a sphere进行补充、说明。）
更早之前，巴比伦人曾试图绘制世界地图，但是他们把它绘制成平盘状而不是托勒密所采用的球体状。
The combination of satellites, which transmit information , computers , which store information , and television , which displays information , will change every home into an education and entertainment center .
（此句中，三个非限定性定语从句分别对三个先行词：satellites ，computers和television进行补充、说明。如果去掉这三个非限定性定语从句，那么句子可简化为：
The combination of satellites , computers and television will change every home into an education and entertainment center .）卫星能传输信息，计算机能储存信息，电视能显示信息，把这些手段结合起来可以使每个家庭都成为教育娱乐的中心。
The sun heats the earth , which makes it possible for plants to grow .（此句中，非限定性定语从句是对全句进行补充、说明,将全句表达的意思看成"一件事情）。太阳给予大地热，这就使植物的生长成为可能。
The old man has a son , who is in the army .（此句中，非限定性定语从句是对先行词son进行补充、说明。但本句所传达的信息是："这位老人只有一个儿子" 。如果将此句改写成限定性定语从句：
The old man has a son who is in the army . 那位老人有一个在部队工作的儿子。那么，限定性定语从句就要对先行词son进行限定、修饰。这样一来，句子所传达的信息就变成了："这位老人有一个儿子在部队工作，还有其他的儿子在干别的工作"。）那位老人有一个儿子，他在部队工作。

,that,which,who,whom,whose,where,when,why分别的使用场合

各种关系代词的使用方法
a) 关系代词who的用法
i. who 的前行词必须是人，在从句中可以担任主语，往往也可以代替在从句中担任宾
语的whom,但是它前边不能有介词，如果带了介词就必须用宾格的whom:
（介词+whom）

This is the teacher who teaches us mathematics.
She is the girl who (whom) I met at the party. （可以替代）
She is the girl whom (who) I went there with. （可以替代）
She is the girl with whom I went there. （不可替代）
ii. who，that在很多情况下可以通用，但是有些情况只能用who:
1. 先行词是one, ones, anyone的时候宜用who.
One who has nothing to fear for oneself dares to tell the truth.
The ones who flatter me don’t please me.
Don’t tell anyone about the news who oughtn’t to know it.
Anyone who fails to finish the task given should be criticized.
2. 先行词为those的时候，宜用who为关系代词
Those who were not fit for their work could not see the beautiful clothes
made of the magic cloth.
Those who want to go to the Great Wall sign up here.
3. 当先行词有比较长的后置定语的时候
I met a foreigner in the street yesterday who could asked me questions in
Chinese.
4. 一个句子中带有两个定语从句，其中一个定语从句的关系代词为that,另一个则用
who.
The boy that you met last night is the group leader who studies very hard.
5. 在there be 开头的句子中
There is an old man who wants to see you.
There are many young men who are against him.

b) 关系代词whose的用法
whose是代词的所有格，它既可以代人也可以代物。当代物的时候，它相当于of which.
I saw a woman whose bag was stolen.
I’ll call a person whose father knows you.
Which is the car whose owner you know? (Which is the car the owner of which
you know)
Please show me the book whose cover is red. (Please show me the book the
cover of which is red)

c) 关系代词that的用法
首先特别注意，that只能用在限定性定语从句中，在非限定性定语从句中永远不能选用
that, 另外介词后边也不可用that, 而是跟which.
在限定性定语从句中，which和that在代替物的时候，一般可以通用。
The money that (which) is in the wallet is mine.

有些情况下，只宜用that,而不宜用which
i. 先行词是最高级形容词或者它前面有最高级形容词的时候
This is the best that has been used against pollution.
English is the most difficult subject that you will learn during these
years.
ii. 先行词是序数词，或者它前面有一个序数词的时候
He is the last person (that) I want to see.
It is the first American movie of this kind that I’ve ever seen.
iii. 主句已有疑问词who或者which的时候
Which is the bike that you lost?
Who is the woman that was praixed at the meeting?
iv. 先行词既有人又有物，宜用that
Do you know the things and persons that they are talking about?
The bike and its rider that had run over an old man were taken to the police
station.
v. 先行词是all, much, little, something, everything, anything, nothing,
none, the one等不定代词时
You should hand in all that you have.
We haven’t got much that we can offer you.
I mean the one that you talked about just now.
vi. 先行词前面Only, any, few, little, no, all, one of, the same, the very 等
词修饰的时候
The only thing that we can do is to give you some money.
Li Ming is the only one that wants to be a teacher.
Li Ming is one of the students that want to be teachers in our class.
vii. 有两个定语从句，其中一个关系代词已用which, 另外一个宜用that.
Edison built up a factory which produced things that had never been seen
before.

d) 关系代词which的用法
在非限定性定语从句中，只宜用which, 不宜用that.
Beijing, which is the capital of China, is a very beautiful city.

在限定性定语从句中which和that在指代物的时候常常可以通用，但是有时只宜用which
而不用that
i. 关系代词前面有介词的时候
This is the hotel in which you will stay.
ii. 如果有两个定语从句，其中的一句的关系词是that, 另一句宜用which.
Let me show you the novel that I borrowed from the library which was newly
open to us.

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？
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"介词+ 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。

2,定语从句的注意点,怎么就能提高正确率
关系代词与介词，关系代词的省略
a) 关系代词和介词
介词放在关系代词的前面时，介词短语只能用which代物，和用whom代人
This is the hero of whom we are proud.
I want to find the very pen with which I wrote that letter.

当介词放在句子的末尾时，可用that/which代物，that/whom/who来作为介词的宾语，
且这个做介词宾语的关系代词往往忽略
This is the hero that (who/whom/忽略) we are proud of.

b) 关系代词的省略
首先注意只有限定性定语从句才能省略，非限定性定语从句绝对不能省略。
在下列情况下，可以省略关系代词。
i. 当关系代词在从句中担任动词宾语的时候
The people (who) we met at the party were very friendly to us.
ii. 关系代词在从句中作介词，而介词在句尾时
Here is the man (that) you have been looking for.
iii. 关系代词在从句中作表语时
Shang Hai is no longer the city (that) it used to be.
iv. 在there be句型中，和先行词为way时，关系代词总是省略
There is an old man (who ) wants to see you.
I don’t like the way (that) you talk to somebody else.

注意，有些动词+介词所组成的短语动词，关系非常紧密，介词不能前置

定语从句注意事项
a) one of + 复数名词 +关系代词+复数型动词
the (only) one of + 复数名词+关系代词+单数型动词
The Great Wall is one of the world-famous buildings that draw lots of
visitors.
Titanic is the (only) one of the most wonderful movies that has been
produced in Hollywood.
b) What不能用于定语从句中。

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。
先行词和关系词二合一
1） Whoever spits in public will be punished here. （Whoever 可以用 anyone who 代替）
2） The parents will use what they have to send their son to technical school.（what 可以用all that代替）
what/whatever; that/what; who/whoever
1）what = the thing which；whatever = anything。例如：
What you want has been sent here. 你要的动词都送来了。
Whatever you want makes no difference to me. 不管你要什么，跟我没什么关系。
2） who= the person that whoever= anyone who。例如：
（错）Who breaks the law will be punished.
（错）Whoever robbed the bank is not clear.
（对）Whoever breaks the law will be punished. 王子犯法，与庶民同罪。
（对）Who robbed the bank is not clear. 谁抢了银行还不清楚。
3） that 和 what
当that引导定语从句时，通常用作关系代词，而引导名词性从句时，是个不充当任何成分的连接词。宾语从句和表语从句中的that常可省略。What只能引导名词性从句，用作连接代词，作从句的具体成分，且不能省略。例如：
I think（that）you will like the stamps. 我想你会喜欢这些邮票的。
What we need is more practice. 我们需要的是更多的实践
这些应该足够掌握了