定语从句一： 先行词： 被定语从句所修饰的词。
二： 关系代词：用来连接定语从句，并在从句中代表先行词的代词。
先行词是物： which that
先行词是人： who that
在从句中的作用： 主语、宾语、表语。
they had a radio. /it could send out messages.
they had a radio which/ that could send out message. (主语)
the girl is my best friend. /she spoke just now.
the girl who/ that spoke just now is my best friend. （主语）
he always buys some books. /he never read them.
he always buys some books (which/ that) he never read. (宾语)
注重点：1.） 定语从句一般直接跟在先行词的后面：
the man who lives next door sells vegetables.
the man sells vegetables who lives next door. (
the car which my uncle just bought was destroyed in the earthquake.
the car was destroyed in the earthquake which my uncle just bought. (
2．）关系代词在从句中作宾语时可以省略：
the young man ( who ) you saw was our manager.
there is something ( that ) we must keep in mind.
3.) 关系代词在从句中作介词的宾语时，介词常可以提前，但介词提前时， 关系代词只能用which 或 whom
the man is a famous runner. /you talked to him just now.
the man to whom you talk just now is a famous runner.
the chair is made of wood. /he is sitting on it now.
the chair on which he is sitting now is made of wood.
he is a library assistant. /i borrowed some books from him.
he is a library assistant from whom i borrowed some books.
it is a famous school. /he graduated from it 3 years ago.
it is a famous school from which he graduated 3 years ago.
the service should be improved. /the students complain a lot about it.
the service about which the students complain a lot should be improved.
有一些动词短语中的介词是固定搭配，不可以拆开，一般还是放在动语之后，不提前：
he is the student. /the teachers are looking for him.
he is the student who the teachers are looking for.
the number of the children is 30. /she takes care of the children.
the number of the children who she takes care of is 30.
三： whose 的用法：
关系代词与其后的名词构成所有格，即“ 的”时，它既既可以修饰指人的先行词，也可以修饰指物的先行词。
the girl is my daughter. /her work got the first prize.
the girl whose work got the first prize is my daughter.
do you know anyone? /his family is in xi’an.
the book is not mine. /the cover of it is red.
i live in the room. /the windows of it face south.
the chair has been repaired. /the leg of it was broken.
四：限制性定语从句和非限制性定语从句：
限制性定语从句：主句和从句不隔开，从句不能省略，否则就会失掉意义不能成立。
he is reading a book which is too difficult for him.
here is the boy who damaged the glass.
非限制性定语从句：主句和从句用逗号隔开，从句对修饰的部分起到进一步说明的作用，拿掉后其它部分的语意仍保持完整。
the book is written by guo jinming, who is only 19 years old.
bob’s father, who was an engineer, spent 4 years in egypt.
shanghai, which is developing fast, has become one of world’s trade center.
注重点：非限制性定语从句不能用that引导。
she is very fond of french, which indeed she speaks quite well.
which还可以用来指代上文中的一件事情。
their house is washed away by the floods, which made them very sad.
he lost his job finally, which was exactly what we wanted.
介词＋which:
the picture __he paid $100 was once owned by a king.
can you think of a situationthis word can be used?
i’m grateful to him for that advice, _i owed all my success.
关系副词： when where why
当先行词是表示时间的名词，用when，在定语从句中充当时间状语，这时一般可以用介词＋which来代替：
i will never forget the day./ i went to university on that day.
i will never forget the day when/ on which i went to university.
he still remember the morning. /the earthquake happened on that morning.
he still remember the morning when/ on which the earthquake happened.
当先行词是表示地点的名词，用where，在定语从句中充当地点状语，这时一般可以用介词＋which来代替：
this is the house. /he used to live in the house.
this is the house where/ in which he used to live.
i know of a place. /we can swim in that place.
i know of a place where/ in which we can swim.
is there any shop around? /i can buy a pen in the shop.
is there any shop around where/ in which i can buy a pen.
先行词是表示原因的名词，即reason，用why，在定语从句中充当原因状语，这时一般可以用for ＋which来代替：
i don’t know the reason. /he did it for this reason.
i don’t know the reason why/ for which he did it.
the reason was not clear. /he was fired for it.
the reason why/ for which he was fired was not clear.
注重点：当表示时间、地点和原因的名词在从句中不是作状语，而是在从句中作主语或宾语时，还是应用which/ that
this is the date __we’re proud of.
this is the date __he was born.
i will never forget the time __we spent together.
this is the factory __my mother works.
this is the factory __we visited last week.
is this factory you visit last week?
a. the one b. where c. which d. that
this factory is the one (that/ which) you visit last week.
i don’t believe the reason __he g**e for his decision.
another reason __he made this decision is that he had to consider the feelings of others.
关系词的选择。
．只用that
a.当先行词是不定代词，如all, everything, anything, nothing, much, few, little, none, the one等。
all that can be done has been done.
i didn’t mean this one; i mean the one that was bought yesterday.
b.先行词（指物的）前面有only, few, one of, little, no, all, every, very等词修饰时。
there’s no difficulty that we can’t overcome.
i’ve read all the books that can be borrowed here.
c.先行词被序数词first, last, next等或形容词的最高级修饰时。
this is the first letter that i’ve written in japanese.
she is the most careful girl that i’ve ever known.
d.当先行词既有人又有物时。
they talked about the teachers and schools that they had visited.
the speaker talked of some writers and books that were unknown to us.
e.当先行词是系动词be后面的表语或关系词本身是从句的表语时。
china isn’t the country that she used to be 50 years ago.
he is no longer the man that he used to be.
it’s a book that will help you a great deal.
f．当主句是以who, which或what开头的非凡疑问句时。
who is the man that is waiting at the bus sto p?
which is the car that overtook us yesterday?
g. 当主句以there be…结构开头时，或关系代词在there be…结构中作实义主语，先行项为物。
there is a seat in the corner that is still free.
there are two tickets of the film that are for you.
the 9.15 is the fastest train that there has ever been.
h. 当先行词是what时。
what did you hear that made you so angry?
英语语法定语从句
第3章定语从句。基础知识 归纳 在主从复合句中用作定语的从句称为定语从句。定语从句通常修饰名词或代词，对它进行限制 描绘和说明。定语从句在句中的作用相当于形容词，故又称为形容词性从句。一 先行词和关系词。被定语从句修饰的词叫先行词。先行词一般出现在定语从句之前。引导定语从句的词叫关系词。关系词不仅引...
英语语法定语从句 一
热点语法 山东潍坊刘永科。一 定语从句概述。定语从句 是英语学习的重点和难点，也是英语高考和其他各类英语考试的必考项目。它是复合句中三大从句 名词性从句 状语从句和定语从句 之一，也是最难掌握的一种从句。定语从句的难点在于它的特殊结构，即 先行词 关系代词 关系副词 从句 许多同学分不清哪是先行词或...
高二英语语法定语从句
快速有效的单词记忆方法。第一是联想法。比如soft是柔软的意思，你可以联想到索芙特洗发水，索芙特洗发水洗出的头发都是柔亮的，它的名字也是这么翻译过来的，索芙特soft 再比如drunk是喝醉了的意思，那么我们就可以这么想，喝是drink，drink和drunk的区别就在于i和u，i就好像是我们喝之前...