定语从句复习一、语法知识归纳定语从句(Attributive Clause)句子作定语叫做定语从句。
定语从句放在先行词之后。
I定语从句的引导词定语从句的引导词有关系代词和关系副词。
1.关系代词(Relative pronoun)(注意：介词后不用that)Do you still remember the chicken farm (that) we visited three months ago?你还记得我们三个月前参观过的养鸡场吗？I live in the house whose window faces the street.(=1 live in the house the window of which faces the street.)我住在窗户朝街的那间房里。
2.关系副词(Relative adverb)We are living in an age when many things are done on computer.我们生活在这样一个时代：许多事情都通过电脑来完成。
II定语从句的分类定语从句分为限制性定语从句和非限制性定语从句。
限制性定语从句(%1)限制性定语从句的基本特征限制性定语从句对被修饰的先行词有限定制约作川，使该词的含义更具体，更明确。
限制性定语从句不能被省略，否则句意就不完整。
从句与先行词Z间没有逗号。
He has two sons who work in the same company. (Perhaps he has more than two sons.) 他有两个在同一家公司工作的儿子。
(%1)限制性定语从句中关系代词的用法I.that, which当先行词指物，并且关系代词在定语从句中充当主语或宾语吋，用which/that 引导定语从句。
在限制性定语从句中有些情况下只能用关系代词that,不用whicho(1)当先行词是不定代词all, much, little, something, everything, anything, nothing, none, the one 时。
You should hand in all that you have.你应该上交你所有的东西。
(2)当先行词前面被the only, the very, any, few, little, no, all 等词修饰时。
The only thing that we can do is to give you some money.我们唯一能做的爭就是给你一些钱。
(3)当先行词是形容词最高级或先行词的前面有形容词最高级修饰时。
This is the most interesting film that Fve ever seen.这是我看过的最有趣的电影。
(4)当先行词是序数词或它前而有序数词修饰吋。
This train is the last that will go to Suzhou.这是最后一班到苏州的火车。
(5)当先行词既有人又有物时。
Do you know the things and persons that they are talking about?你知道他们在谈论的人和事吗？(6)当主句的主语是疑问词who或which时。
Who is the boy that won the gold medal?获得金牌的男孩是谁？(7)有两个定语从句时，其中一个关系代词已用which,另外一个宜用that«They secretly built up a small factory which produced things that could cause pollution. 他们悄悄建了一座生产一些能产生污染的东西的小厂。
(8)当先行词在主句中作表语，而关系代词也在从句中作表语时。
Shanghai is no longer the city that it used to be.上海不再是过去的那座城市了。
2.who, whom当先行词指人，并且关系代词在定语从句中充当主语吋，用who/that,不可省略; 当先行词指人，并且关系代词在定语从句中充当宾语时，用whom/that/who,可以省略。
She is the girl who lives next door*.她就是住在隔壁的女孩。
(先行词在定语从句中作主语)That's the girl (whom/that) 1 teach.那就是我教的女孩。
(先行词在定语从句中作宾语)3.whose无论先行词指人还是物，关系代词在定语从句中作定语时，用whose,不可省略。
This is the scientist whose achievements aie well known.这就是那位成绩卓著的科学家。
This is the house whose window broke last night.=This is the house of which the window broke last night・=This is the house, the window of which broke last night.这就是昨晚窗子被打坏的那所房子。
4・介词+which/whom⑴当介词放在关系代词的前而吋，关系代词只能用which(指物)或whom(指人)，关系代词不能省略。
In the dark street, there wasn^t a single person to whom she could turn for help.在漆黑的街上，没有一个她可以求助的人。
注意：在一•些固定搭配的动词短语中，山于动词和介词不可分割，因此不能把介词置于关系代词之前。
This is the pen (which/that) Lm looking fo匚这是我在找的笔。
（不可以说:This is the pen for which Fm looking.）（2）当介词位于定语从句的末尾时，可用（hat/which （指物），that/whom/who （指人）作从句中介词的宾语，而且作介词宾语的关系代词可以省略。
This is the hero （that/who/whom） we are proud of.这就是我们为之骄傲的英雄。
This is the pen （that / which） I wrote the letter with.这就是我用来写信的笔。
5. asas引导的定语从句常和such, so, the same, as连用PH buy the same dictionary as you have. 我耍买和你一样的字典。
We have found such materials as aie used in their factory.我们已找到了像他们工厂里用的那种材料。
（三）限制性定语从句中关系副词的丿IJ法当先行词在定语从句中作状语时，要川关系副词。
其中when =表时间的介词（如：in, at, during 等）+ which； where =表地点的介词（如:in, at, on, under 等）+which； why =表原因的介词（如：for） + which： how =表方式的介词（ill： in） +which。
Can you tell me the office where he works? （= in which）你能告诉我他工作的办公室吗？Do you know the reason why he is absent? （= for which）你知道他缺席的原因吗？非限制性定语从句（一）非限制性定语从句的基本特点有逗号将主句和从句隔开的定语从句叫非限定性定语从句。
非限制性定语从句的作用是用来提供附加的而非必耍的信息，只是对先行词作进一步的解释、补充或说明。
若去掉此定语从句，整个主句意义很明确，不会引起误解和歧义。
My mother, who is 50 this year, lives with me now.我的母亲50 岁了,她现在和我住在一起。
注意：非限定性定语从旬中不用关系代词that（二）非限制性定语从句中关系代词、关系副词的用法非限制性定语从句中关系代词、关系副词的用法与限制性定语从句中的用法大体相当，但也有一些特别的地方，需要考生注意。
1.在非限制性定语从句中,不可用that引导从句。
先行词指物时,只可用whicho另夕卜，which不仅仅指代先行词，还可以用來替代主句的整个内容或行为。
Helen was much kinder to her youngest son than to the others, which, of course, made the others envy him.海伦对最小儿子要比对其他孩子好得多，这当然使得其他孩子非常妒忌他。
2.在非限制性定语从句中，可用“名词/代词+介词（of）+which/whom”的结构。
Recently I bought an ancient vase, the price of which was very reasonable. 最近，我买了个古董花瓶，它的价格相当合理。
3.“复合介词短语+关系代词which/whom”引导的定语从句非限制性定语从句，从句内部常用倒装语序。
He lived in a big house, in front of which stood a big tall tree.他住在一栋大房子里，房子前面有棵人树。
4.在关系副词where/when前有时可以加介词from, to等。
China is the birth place of kites, from where kite flying spread to Japan, Korea, Thailand and India.中国是风筝的发源地，从这里放风筝的活动传播到了日本、韩国、泰国和卬度。
5.关系代词as, which引导非限制性定语从句时的区别(1) as和which都可替代主句的整个内容,而不是主句中的某一个词。
as引导的非限制性定语从句，既可在主句前，乂可在主句后，有吋还可插入主句中，而which 引导的非限制性定语从句一般置于主句之后。
The weather turned out to be very good, which was more than we could expect.结果天气很好，这出乎我们的意料。
As is known to everybody, the moon travels round the earth once every month.=The moon travels round the earth once every month, as/which is known to everybody. 众所周知，月亮每月绕地球一圈。