Question

定语从句（英语语法），急求！！！谢谢

Answer 1

定语从句（Attributive Clauses）在句中做定语，修饰一个名词或代词，被修饰的名词,词组或代词即先行词。定语从句通常出现在先行词之后，由关系词（关系代词或关系副词）引出。

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。关系代词有that, which, who, whom, whose, as等，绝对没有what；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。 注：关系代词有主语、宾语之分。一般whom作为宾语。关系代词在从句中作主语，宾语，表语，定语等，关系副词在从句中作地点状语，时间状语，原因状语等。

定语
定语用来限定、修饰名词或代词的，是对名词或代词起修饰、限定作用的词、短语（动词不定式短语、动名词短语和分词短语）或句子，汉语中常用‘……的’表示。主要由形容词担任，此外，名词，代词，数词，分词，副词，不定式以及介词短语也可以来担任，也可以由一个句子来担任。单词作定语时通常放在它所修饰的词之前，作前置定语。短语和从句作定语时则放在所修饰的词之后，作后置定语。

难点分析
（一）限制性定语从句只能用that的几种情况 1、当先行词是anything, everything, nothing (something 除外), few, all, none, little, some等代词时，或者是由every, any, all, some, no, little, few, much，each等修饰时 (1) Have you taken down everything (that) Mr. Li has said? (2) There seems to be nothing (that) seems impossible for him in the world. (3) All that can be done has been done. (4) There is little (that) I can do for you. 注意1：部分时候that可以省略，如部分例句将that用括号括住。 注意2：当先行词指人时，偶尔也可以用who (4) Any man that/.who has a sense of duty won’t do such a thing. 2、当先行词被序数词修饰 The first place that they visited in London was the Big Ben. 3、当先行词被形容词最高级修饰时 This is the best film that I have seen. 4、当形容词被the very, the only，the same,the last 修饰时 (1) This is the very good dictionary that I want to buy, (2) After the fire in his house, the old car is the only thing that he owned. 当先行词指人时，偶尔也可以用who (3) Wang Hua is the only person in our school who will attend the meeting？ 5、当先行词前面有who, which等疑问代词时 (1) Who is the man that is standing there? (2) Which is the T-shirt that fits me most? 6、当先行词既有人，也有动物或者物体时 Can you remember the scientist and his theory that we have learned? 7.当关系代词在定语从句中做表语 The village is no longer the one that it used to be 10 years ago. 8.当在there be句型中，通常情况下用that，不用which （二）关系代词as和which引导的定语从句as和which引导非限制性定语从句，有相同之处也有不同之处。具体情况是： 1、As和which都可以在定语从句中做主语或者宾语，代表前面整个句子。 (1) He married her, as/which was natural. (2) He was honest, as/which we can see. 2、as 引导非限制性定语从句，可放在主句之前，或者主句之后，甚至可以切割一个主句；which引导的非限制性定语从句只能放在主句之后。另外，as有“正如……，正像……”的意思 (1) As is known to all, China is a developing country. (2) He is from the south, as we can see from his accent. (3) John, as you know, is a famous writer. (4) He has been to Paris more than several times, which I don’t believe. 注意：当主句和从句存在逻辑上的因果关系时，常用which。 (5) Tom was always late for school, which made his teacher angry. 3、当先行词受such, the same修饰时，常用as (1) I have never heard such a story as he tells. (2) He is not such a fool as he looks. (3) This is the same book as I lost last week. 注意：当先行词由the same修饰时，偶尔也用that引导定语从句，但是和由as所引导的定语从句意思不同 (4) She wore the same dress that she wore at Mary’s wedding. 她穿着她在MARY婚礼上穿过的一条裙子。 (5) She wore the same dress as her young sister wore. 她穿着和她妹妹所穿的一样的裙子。 注意：定语从句such…as …与结果状语从句such… that…的区别：as在所引导的定语从句中作主语，宾语；that在结果状语从句中不做成分 (6)He has such a good laptop as I want to buy. (7)He has such a good laptop that I want to buy one. (三）以the way为先行词的定语从句通常由in which, that引导，而且通常可以省略。 The way in which/ that/./ he answered the question was surprising. (四) but有时也可以做关系词引导定语从句 There are very few but understand his idea。 ( but= who don’t ) (五) 区分定语从句和同位语从句 1、定语从句修饰先行词，它和先行词是修饰关系； 同位语从句说明先行词的具体内容，是补充说明的关系 (1) The plane that has just taken off is for London. 定语从句 (2) The fact that he has been dead is clear. 同位语从句 2、定语从句由关系代词或者关系副词引导，关系词在句中充当成分，有时可以省略； 同位语从句主要由that引导，在句中一般不做成分； 句子也可以由when, where, how, why, whether, what等词引导，充当成分 (1) The news he told me is true. (2) The news that he has just died is true. (3) The problem that we are facing now is how we can collect so much money. 定语 (4) The problem how we can collect so much money is difficult to solve. 3、 同位语从句和先行词一般可以用be动词发展成一个完整的句子，而定语从句不可以发展成一个完整的句子， (1) The idea that we could ask the teacher for advice is wonderful. 同位语 (2) The idea was that we could ask the teacher for advice. (3) The fact that the moon moves around the earth is known to all. (4) The fact is that the earth moves around the earth. 〔定语从句〕介词+关系词 1）介词后面的关系副词不能省略。 2）that前不能有介词。 3）某些在从句中充当时间，地点或原因状语的"介词+关系词"结构可以同关系副词when 和where 互换。例如： This is the house in which I lived two years ago. 这是我两年前住过的房子。 This is the house where I lived two years ago. Do you remember the day on which you joined our club？ 还记得你加入我们俱乐部的那一天吗？ Do you remember the day when you joined our club？

http://baike.baidu.com/view/56536.htm
我不都贴过来了，你需要哪些方面我不是很清楚，麻烦自己找找去咯~

Answer 2

定语从句即用句子来做定语，被修饰或被限制的词称作先行词，例如
1.I don't know the girl who is talking there.
2.I don't know the girl who you met just now.
3.Give me the book that you read just now.
4.Give me the book ,which you read just now.
5.Give me the pen that you write with.
6.Give me the pen with which you write .
仔细看句子中的book 和pen就是先行词，他们后面的who that which 就是引导定语从句的关系代词，当先行词是人用who,先行词是物用that,先行词后出现介词或逗号用which.

Answer 3

I have bought a new mobilephone for my brother who is a doctor.

Answer 4

二楼的很详细，不过你要是懒得看的话，可以私聊给我