英语复合句
复合句也称主从句，即主句和从句，从句须有引导词或叫连词引出，否则复合句不成立。
复合句分为并列复合句compound sentence（也称并列句）和主从或从属复合句complex sentence（也称复杂句），并列复合句compound sentence是有并列连词：and、or、but连接；从属复合句complex sentence由一个主句（Principal Clause)和一个或一个以上的从句(Subordinate Clause)构成。
扩展资料：
复合句分类：
1、定语从句（The Attributive Clause）：
定语从句（也称关系从句、形容词性从句），一个句子跟在一名词或代词（先行词）后进行修饰限定，就叫做定语从句。通俗来讲，从句在整个句子中做定语，这个从句就叫做定语从句。从句在主句中充当定语成分。
被修饰的词叫先行词。定语从句不同于单词作定语的情况，它通常只能放在被修饰的词（即先行词）之后。
引导词分为“关系代词”和“关系副词”。
2、状语从句（The Adverbial Clause）：
状语从句指句子用作状语时，起副词作用的句子。状语从句中的从句可以修饰谓语、非谓语动词、定语、状语或整个句子。根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句。
状语从句一般由连词(从属连词)引导，也可以由词组引起。从句位于句首或句中时通常用逗号与主句隔开，位于句尾时可以不用逗号隔开。
3、名词性从句（The Noun Clause）：
1）宾语从句
在句子中起宾语作用的从句叫做宾语从句。宾语从句的引导词和主语从句的引导词相同。宾语从句可以作及物动词的宾语，作短语动词的宾语，介词的宾语。
2）主语从句
在复合句中充当主语成分的句子叫做主语从句。常规主语从句，即句子在复合句中充当一个主语。主语从句的时态：不受主句的时态影响和限制。
参考资料来源：百度百科-复合句
从句子结构上来说，句子有三种：简单句、并列句和复合句。简单句有一个主语或多个主语和一个谓语；一个主语和多个谓语。并列句是由并列连词连接的两个或多个简单句。复合句指的是含有两个或更多的主谓结构的句子，其中有一个（或更多）主谓结构充当句子的某一（些）成分，如主语、宾语、表语、定语、状语、同位语等。主语从句、宾语从句、表语从句、同位语从句、定语从句和状语从句都属于复合句。
一、状语从句：
状语从句 Adverbial Clause，从句用作状语称为状语从句。根据用途，状语从句可分为时间、地点、原因、条件、方式、让步、结果、目的等状语从句。
I. 时间状语从句
时间状语从句表示时间，常用的关联词有when, until, as, after, before, once, since, as long as, whenever等等。
例: 1) When you cross a main road, you must be careful.
2) He went out to play football after he had finished his homework.
3) Wait until you are called.
4) I can't recognize you. You are so changed since last we met.
5) He didn't go to school until he was eleven.
You can use my house as long as you are careful.
He is so terrible once he is drunk.
I listen to the radio while I walk every evening.
II. 地点状语从句
地点状语从句表示地点，常用的关联词有where, wherever, anywhere等。
例如：1) Put it where you found it.
2) Sit down wherever you like.
3) Anywhere she goes, he goes too.
III. 原因状语从句
原因状语从句表示原因或理由，常用的关联词有because, as, since, in case等。
1) I eat ice-cream so much because I like sweet food.
2) As I didn't know the way, I asked a policeman.
3) Since you won't help me, I'll ask someone else.
I'll take my raincoat in case it rains. (in case it rains = because it may rain)我将带上雨衣，以防下雨。
IV. 条件状语从句
条件状语从句表示真实的或现实的条件，引导从句所用的关联词有if, unless, suppose, in case(that), in the event (that), as (so) long as等等。
1) If it snows tomorrow, we will build a snowman.
You'll be late, unless you hurry.
3) Suppose we are late, what will he say? (suppose从句必须放在主句之前) 我们如果迟到了，他会说什么？
4) In the event that our team wins, there will be a party.
5) In case it rains, do not expect me. 如果下雨，就不要等我了。
6) He will do anything as(so) long as it is interesting. 只要好玩，他什么都愿意做。
V. 方式状语从句
方式状语从句表示动作的方式，回答How的问题，常用关联词as, as if, as though, the way(that), in the way(that)等引导，一般置于主语之后。
Do as I say. I did just as you told me. 照我说的去做。我就是照你说的去做的。
He acts as if/as though he is the owner. 他行为举止好象是这儿的主人似的。
They did it in a way that I had never seen before. 他们以我从没见过的方式行事。
I was never allowed to sing the way I wanted to. 我从未被允许用自己想用的方式唱歌。
VI. 让步状语从句
让步状语从句表示“虽然、尽管、即使”等概念，使句子具有对比的因素。常用的关联词有although, though, even if, even though, not that(=although…not)等，置于主语之前或后。
1) Although you feel very ill right now, this is still a common disease.
2) Though he has lived for years in London, he writes in French.
3) We intend to go U.S., even if air fares are expensive.
4) Even though fruits are good, you can't live with fruits only.
5) I'm OK now, not that I slept (although I did not sleep) very well last night.
VII. 结果状语从句
结果状语从句表示结果， 常由连词so…that, such(a/an)…that, so that, such that等引导，置于主语之后。
She was so frightened about the dog that she cried.
The news worried him so much that he didn't sleep at all for the whole night.
He is such a wonderful joker that you can't help laughing.
They are such wonderful players that no one can beat them.
We arrived early, so that we got good seats.
The weather was such that I couldn't go out.
VIII. 目的状语从句
目的状语从句表示目的，回答what for或 for what purpose的问题，常用关联词so that, in order that等引导，一般置于主语之后。目的状语从句中的谓语动词常由“情态动词+动词原形”构成。
Ships carry lifeboats so that people can escape if the ship sinks.
They wrote the notice in several languages so that foreigners could understand it.
We carved their names on the stone in order that people should always remember them.
They risk their lives so that/in order that they may support their kids.
一、状语从句：
状语从句 Adverbial Clause，从句用作状语称为状语从句。根据用途，状语从句可分为时间、地点、原因、条件、方式、让步、结果、目的等状语从句。
I. 时间状语从句
时间状语从句表示时间，常用的关联词有when, until, as, after, before, once, since, as long as, whenever等等。
例: 1) When you cross a main road, you must be careful.
2) He went out to play football after he had finished his homework.
3) Wait until you are called.
4) I can't recognize you. You are so changed since last we met.
5) He didn't go to school until he was eleven.
You can use my house as long as you are careful.
He is so terrible once he is drunk.
I listen to the radio while I walk every evening.
II. 地点状语从句
地点状语从句表示地点，常用的关联词有where, wherever, anywhere等。
例如：1) Put it where you found it.
2) Sit down wherever you like.
3) Anywhere she goes, he goes too.
III. 原因状语从句
原因状语从句表示原因或理由，常用的关联词有because, as, since, in case等。
1) I eat ice-cream so much because I like sweet food.
2) As I didn't know the way, I asked a policeman.
3) Since you won't help me, I'll ask someone else.
I'll take my raincoat in case it rains. (in case it rains = because it may rain)我将带上雨衣，以防下雨。
IV. 条件状语从句
条件状语从句表示真实的或现实的条件，引导从句所用的关联词有if, unless, suppose, in case(that), in the event (that), as (so) long as等等。
1) If it snows tomorrow, we will build a snowman.
You'll be late, unless you hurry.
3) Suppose we are late, what will he say? (suppose从句必须放在主句之前) 我们如果迟到了，他会说什么？
4) In the event that our team wins, there will be a party.
5) In case it rains, do not expect me. 如果下雨，就不要等我了。
6) He will do anything as(so) long as it is interesting. 只要好玩，他什么都愿意做。
V. 方式状语从句
方式状语从句表示动作的方式，回答How的问题，常用关联词as, as if, as though, the way(that), in the way(that)等引导，一般置于主语之后。
Do as I say. I did just as you told me. 照我说的去做。我就是照你说的去做的。
He acts as if/as though he is the owner. 他行为举止好象是这儿的主人似的。
They did it in a way that I had never seen before. 他们以我从没见过的方式行事。
I was never allowed to sing the way I wanted to. 我从未被允许用自己想用的方式唱歌。
VI. 让步状语从句
让步状语从句表示“虽然、尽管、即使”等概念，使句子具有对比的因素。常用的关联词有although, though, even if, even though, not that(=although…not)等，置于主语之前或后。
1) Although you feel very ill right now, this is still a common disease.
2) Though he has lived for years in London, he writes in French.
3) We intend to go U.S., even if air fares are expensive.
4) Even though fruits are good, you can't live with fruits only.
5) I'm OK now, not that I slept (although I did not sleep) very well last night.
VII. 结果状语从句
结果状语从句表示结果， 常由连词so…that, such(a/an)…that, so that, such that等引导，置于主语之后。
She was so frightened about the dog that she cried.
The news worried him so much that he didn't sleep at all for the whole night.
He is such a wonderful joker that you can't help laughing.
They are such wonderful players that no one can beat them.
We arrived early, so that we got good seats.
The weather was such that I couldn't go out.
VIII. 目的状语从句
目的状语从句表示目的，回答what for或 for what purpose的问题，常用关联词so that, in order that等引导，一般置于主语之后。目的状语从句中的谓语动词常由“情态动词+动词原形”构成。
Ships carry lifeboats so that people can escape if the ship sinks.
They wrote the notice in several languages so that foreigners could understand it.
We carved their names on the stone in order that people should always remember them.
They risk their lives so that/in order that they may support their kids.
二、定语从句
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。
关系代词有：who, whom, whose, that, which等。
关系副词有：when, where, why等
1. 关系代词引导的定语从句
关系代词所代替的先行词是人或物的名词或代词，并在句中充当主语、宾语、定语等成分。关系代词在定语从句中作主语时，从句谓语动词的人称和数要和先行词保持一致。
1）who, whom, that 这些词代替的先行词是人的名词或代词，在从句中所起作用如下：
Is he the man who/that wants to see you?
他就是你想见的人吗？（who/that在从句中作主语）
He is the man whom/ that I saw yesterday.
他就是我昨天见的那个人。（whom/that在从句中作宾语）
2) Whose 用来指人或物，(只用作定语, 若指物，它还可以同of which互换），例如：
They rushed over to help the man whose car had broken down.
那人车坏了，大家都跑过去帮忙。
Please pass me the book whose (of which) cover is green.
请递给我那本绿皮的书。
3） which, that 它们所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等，例如： A prosperity which / that had never been seen before appears in the countryside.
农村出现了前所未有的繁荣。（which / that在句中作宾语）
The package (which / that) you are carrying is about to come unwrapped.
你拿的包快散了。(which / that在句中作宾语)
2. 关系副词引导的定语从句
关系副词可代替的先行词是时间、地点或理由的名词，在从句中作状语。
1）when, where, why 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？
2）that代替关系副词that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
3. 判断关系代词与关系副词
方法一： 用关系代词，还是关系副词完全取决于从句中的谓语动词。及物动词后面无宾语，就必须要求用关系代词；而不及物动词则要求用关系副词。例如：
This is the mountain village where I stayed last year.
I'll never forget the days when I worked together with you.
习惯上总把表地点或时间的名词与关系副词 where, when联系在一起。
方法二： 准确判断先行词在定语从句中的成分(主、谓、宾、定、状)，也能正确选择出关系代词/关系副词。
4. 限制性和非限制性定语从句
1) 定语从句有限制性和非限制性两种。限制性定语从句是先行词不可缺少的部分，去掉它主句意思往往不明确；非限制性定语从句是先行词的附加说明，去掉了也不会影响主句的意思，它与主句之间通常用逗号分开，例如：
This is the house which we bought last month.
这是我们上个月买的那幢房子。（限制性）
The house, which we bought last month, is very nice.
这幢房子很漂亮，是我们上个月买的。（非限制性）
2) 当先行词是专有名词或物主代词和指示代词所修饰时，其后的定语从句通常是非限制性的，例如： Charles Smith, who was my former teacher, retired last year.
查理·史密斯去年退休了，他曾经是我的老师。
My house, which I bought last year, has got a lovely garden.
我去年买的的那幢房子带着个漂亮的花园。
This novel, which I have read three times, is very touching.
这本小说很动人，我已经读了三遍。
3) 非限制性定语从句还能将整个主句作为先行词, 对其进行修饰, 这时从句谓语动词要用第三人称单数，例如：
He seems not to have grasped what I meant, which greatly upsets me.
他似乎没抓住我的意思，这使我心烦。
Liquid water changes to vapor, which is called evaporation.
液态水变为蒸汽，这就叫做蒸发。
说明：关系代词that和关系副词why不能引导非限制性定语从句。
5. 介词+关系词
1）介词后面的关系词不能省略。
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。
This is the house in which I lived two years ago.
This is the house where I lived two years ago.
Do you remember the day on which you joined our club?
Do you remember the day when you joined our club?
6. 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。
as 和which在引导非限制性定语从句时，这两个关系代词都指主句所表达的整个意思，且在定语从句中都可以作主语和宾语。但不同之处主要有两点：
(1） as 引导的定语从句可置于句首，而which不可。
(2） as 代表前面的整个主句并在从句中作主语时，从句中的谓语必须是系动词；若为行为动词，则从句中的关系代词只能用which。
7. 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)
8. what/whatever;that/what; who/whoever
1）what = the thing which；whatever = anything
2) who= the person that whoever= anyone who
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。
9. 关系代词that 的用法
1）不用that的情况
a) 在引导非限定性定语从句时。
b) 介词后不能用。
2) 只能用that作为定语从句的关系代词的情况
a) 在there be 句型中，只用that，不用which。
b) 在不定代词，如：anything, nothing, the one, all, much, few, any, little等作先行词时，只用that，不用which。
c) 先行词有the only, the very修饰时，只用that。
d) 先行词为序数词、数词、形容词最高级时，只用that。
e) 先行词既有人，又有物时,只用that。
三、名词性从句：
在句子中充当主语、宾语、表语与同位语的句子分别叫做主语从句、宾语从句、表语从句和同位语从句， 这些统称为名词性从句。
（一）主语从句
在复合句中用作主语的从句叫主语从句。
A 为了强调主语从句的内容，可将从句置于句首
B 大部分主语从句都可以用it作形式主语
为了保持句子平衡，主语从句常用it作形式主语，将主语从句后置。用it作形式主语的主语从句结构有如下几种：
1、It is + 名词 + that从句
2、It is + 形容词 + that从句
3、It + 动词 + that从句
4、It is + 过去分词 + that从句
用形式主语it引导的主语从句相当多，有些已形成固定的语法和译法。常见的有：
It is said that... 据说……
It is reported that... 据报导……
It is well known that... 众所周知……
It is announced that... 据宣布……
It is believed that... 人们相信……
It is thought that... 人们认为……
It is understood that... 自不待言……
It must be pointed out that... 必须指出……
It must be admitted that... 必须承认……
（二）宾语从句
宾语从句 The Object Clause，在复合句中作主句的宾语，它属于名词性从句。它可以作主句谓语动词的宾语，也可以作介词的宾语。宾语从句以从句的句式来决定连接词。
宾语从句有四步曲
连接词： （也叫引导词）
语序： 从句的词序用陈述语序（主+ 谓）
时态： 主句的时态如果是过去时，从句的时态应以过去时为基础作相应的变化。
人称： 要根据句中的意义作相应的变化
连接词（引导词）
从属连词 that ，if ，whether
连接代词 who， whom， whose， which， what
连接副词 when ，where ，how ，why
1.如果陈述句作从句，连接词用that,在口语和非正式语体中常可省略that 。
2.特殊疑问句作从句，就用原来的特殊疑问词
3.一般疑问句作从句，连词用if或whether 在选择疑问句只用whether，记住这一结构：whether … or not 。
（三）表语从句
表语从句放在连系动词之后，充当复合句中的表语。
A 可接表语从句的连系动词
可接表语从句的连系动词有be, look, seem, sound, appear等。
B as, as if / though引导的表语从句
C because, why引导的表语从句
what引导的主语从句表示结果或名词reason作主语时，后面的表语从句表示原因时要用that引导，不宜用because。
D 使用虚拟语气的表语从句
在表示建议、劝告、命令含义的名词后的表语从句，谓语动词需用"should+动词原形"表示，should可省略。常见的词有：advice, suggestion, order, proposal, plan, idea等。
（四）同位语从句
同位语从句用于对前面的名词作进一步解释，说明名词的具体内容。同位语从句一般由that引导，但也可以由whether以及连接代词和连接副词引导。
A 同位语从句一般跟在名词的后面
同位语从句一般跟在名词fact, hope, idea, news, doubt, suggestion, information, opinion, decision, discovery, truth, promise, statement, problem, rule等后面。
B 使用虚拟语气的同位语从句
在一些表示“建议、命令、要求”的名词后的同位语从句中，谓语动词用"should + 动词原形"，should可省略。
从句子结构上来说，句子有三种：简单句、并列句和复合句。简单句有一个主语或多个主语和一个谓语；一个主语和多个谓语。并列句是由并列连词连接的两个或多个简单句。复合句指的是含有两个或更多的主谓结构的句子，其中有一个（或更多）主谓结构充当句子的某一（些）成分，如主语、宾语、表语、定语、状语、同位语等。主语从句、宾语从句、表语从句、同位语从句、定语从句和状语从句都属于复合句。
一、状语从句：
状语从句 Adverbial Clause，从句用作状语称为状语从句。根据用途，状语从句可分为时间、地点、原因、条件、方式、让步、结果、目的等状语从句。
I. 时间状语从句
时间状语从句表示时间，常用的关联词有when, until, as, after, before, once, since, as long as, whenever等等。
例: 1) When you cross a main road, you must be careful.
2) He went out to play football after he had finished his homework.
3) Wait until you are called.
4) I can't recognize you. You are so changed since last we met.
5) He didn't go to school until he was eleven.
You can use my house as long as you are careful.
He is so terrible once he is drunk.
I listen to the radio while I walk every evening.
II. 地点状语从句
地点状语从句表示地点，常用的关联词有where, wherever, anywhere等。
例如：1) Put it where you found it.
2) Sit down wherever you like.
3) Anywhere she goes, he goes too.
III. 原因状语从句
原因状语从句表示原因或理由，常用的关联词有because, as, since, in case等。
1) I eat ice-cream so much because I like sweet food.
2) As I didn't know the way, I asked a policeman.
3) Since you won't help me, I'll ask someone else.
I'll take my raincoat in case it rains. (in case it rains = because it may rain)我将带上雨衣，以防下雨。
IV. 条件状语从句
条件状语从句表示真实的或现实的条件，引导从句所用的关联词有if, unless, suppose, in case(that), in the event (that), as (so) long as等等。
1) If it snows tomorrow, we will build a snowman.
You'll be late, unless you hurry.
3) Suppose we are late, what will he say? (suppose从句必须放在主句之前) 我们如果迟到了，他会说什么？
4) In the event that our team wins, there will be a party.
5) In case it rains, do not expect me. 如果下雨，就不要等我了。
6) He will do anything as(so) long as it is interesting. 只要好玩，他什么都愿意做。
V. 方式状语从句
方式状语从句表示动作的方式，回答How的问题，常用关联词as, as if, as though, the way(that), in the way(that)等引导，一般置于主语之后。
Do as I say. I did just as you told me. 照我说的去做。我就是照你说的去做的。
He acts as if/as though he is the owner. 他行为举止好象是这儿的主人似的。
They did it in a way that I had never seen before. 他们以我从没见过的方式行事。
I was never allowed to sing the way I wanted to. 我从未被允许用自己想用的方式唱歌。
VI. 让步状语从句
让步状语从句表示“虽然、尽管、即使”等概念，使句子具有对比的因素。常用的关联词有although, though, even if, even though, not that(=although…not)等，置于主语之前或后。
1) Although you feel very ill right now, this is still a common disease.
2) Though he has lived for years in London, he writes in French.
3) We intend to go U.S., even if air fares are expensive.
4) Even though fruits are good, you can't live with fruits only.
5) I'm OK now, not that I slept (although I did not sleep) very well last night.
VII. 结果状语从句
结果状语从句表示结果， 常由连词so…that, such(a/an)…that, so that, such that等引导，置于主语之后。
She was so frightened about the dog that she cried.
The news worried him so much that he didn't sleep at all for the whole night.
He is such a wonderful joker that you can't help laughing.
They are such wonderful players that no one can beat them.
We arrived early, so that we got good seats.
The weather was such that I couldn't go out.
VIII. 目的状语从句
目的状语从句表示目的，回答what for或 for what purpose的问题，常用关联词so that, in order that等引导，一般置于主语之后。目的状语从句中的谓语动词常由“情态动词+动词原形”构成。
Ships carry lifeboats so that people can escape if the ship sinks.
They wrote the notice in several languages so that foreigners could understand it.
We carved their names on the stone in order that people should always remember them.
They risk their lives so that/in order that they may support their kids.
二、定语从句
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。
关系代词有：who, whom, whose, that, which等。
关系副词有：when, where, why等
1. 关系代词引导的定语从句
关系代词所代替的先行词是人或物的名词或代词，并在句中充当主语、宾语、定语等成分。关系代词在定语从句中作主语时，从句谓语动词的人称和数要和先行词保持一致。
1）who, whom, that 这些词代替的先行词是人的名词或代词，在从句中所起作用如下：
Is he the man who/that wants to see you?
他就是你想见的人吗？（who/that在从句中作主语）
He is the man whom/ that I saw yesterday.
他就是我昨天见的那个人。（whom/that在从句中作宾语）
2) Whose 用来指人或物，(只用作定语, 若指物，它还可以同of which互换），例如：
They rushed over to help the man whose car had broken down.
那人车坏了，大家都跑过去帮忙。
Please pass me the book whose (of which) cover is green.
请递给我那本绿皮的书。
3） which, that 它们所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等，例如： A prosperity which / that had never been seen before appears in the countryside.
农村出现了前所未有的繁荣。（which / that在句中作宾语）
The package (which / that) you are carrying is about to come unwrapped.
你拿的包快散了。(which / that在句中作宾语)
2. 关系副词引导的定语从句
关系副词可代替的先行词是时间、地点或理由的名词，在从句中作状语。
1）when, where, why 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？
2）that代替关系副词that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
3. 判断关系代词与关系副词
方法一： 用关系代词，还是关系副词完全取决于从句中的谓语动词。及物动词后面无宾语，就必须要求用关系代词；而不及物动词则要求用关系副词。例如：
This is the mountain village where I stayed last year.
I'll never forget the days when I worked together with you.
习惯上总把表地点或时间的名词与关系副词 where, when联系在一起。
方法二： 准确判断先行词在定语从句中的成分(主、谓、宾、定、状)，也能正确选择出关系代词/关系副词。
4. 限制性和非限制性定语从句
1) 定语从句有限制性和非限制性两种。限制性定语从句是先行词不可缺少的部分，去掉它主句意思往往不明确；非限制性定语从句是先行词的附加说明，去掉了也不会影响主句的意思，它与主句之间通常用逗号分开，例如：
This is the house which we bought last month.
这是我们上个月买的那幢房子。（限制性）
The house, which we bought last month, is very nice.
这幢房子很漂亮，是我们上个月买的。（非限制性）
2) 当先行词是专有名词或物主代词和指示代词所修饰时，其后的定语从句通常是非限制性的，例如： Charles Smith, who was my former teacher, retired last year.
查理·史密斯去年退休了，他曾经是我的老师。
My house, which I bought last year, has got a lovely garden.
我去年买的的那幢房子带着个漂亮的花园。
This novel, which I have read three times, is very touching.
这本小说很动人，我已经读了三遍。
3) 非限制性定语从句还能将整个主句作为先行词, 对其进行修饰, 这时从句谓语动词要用第三人称单数，例如：
He seems not to have grasped what I meant, which greatly upsets me.
他似乎没抓住我的意思，这使我心烦。
Liquid water changes to vapor, which is called evaporation.
液态水变为蒸汽，这就叫做蒸发。
说明：关系代词that和关系副词why不能引导非限制性定语从句。
5. 介词+关系词
1）介词后面的关系词不能省略。
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。
This is the house in which I lived two years ago.
This is the house where I lived two years ago.
Do you remember the day on which you joined our club?
Do you remember the day when you joined our club?
6. 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。
as 和which在引导非限制性定语从句时，这两个关系代词都指主句所表达的整个意思，且在定语从句中都可以作主语和宾语。但不同之处主要有两点：
(1） as 引导的定语从句可置于句首，而which不可。
(2） as 代表前面的整个主句并在从句中作主语时，从句中的谓语必须是系动词；若为行为动词，则从句中的关系代词只能用which。
7. 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)
8. what/whatever;that/what; who/whoever
1）what = the thing which；whatever = anything
2) who= the person that whoever= anyone who
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。
9. 关系代词that 的用法
1）不用that的情况
a) 在引导非限定性定语从句时。
b) 介词后不能用。
2) 只能用that作为定语从句的关系代词的情况
a) 在there be 句型中，只用that，不用which。
b) 在不定代词，如：anything, nothing, the one, all, much, few, any, little等作先行词时，只用that，不用which。
c) 先行词有the only, the very修饰时，只用that。
d) 先行词为序数词、数词、形容词最高级时，只用that。
e) 先行词既有人，又有物时,只用that。
三、名词性从句：
在句子中充当主语、宾语、表语与同位语的句子分别叫做主语从句、宾语从句、表语从句和同位语从句， 这些统称为名词性从句。
（一）主语从句
在复合句中用作主语的从句叫主语从句。
A 为了强调主语从句的内容，可将从句置于句首
B 大部分主语从句都可以用it作形式主语
为了保持句子平衡，主语从句常用it作形式主语，将主语从句后置。用it作形式主语的主语从句结构有如下几种：
1、It is + 名词 + that从句
2、It is + 形容词 + that从句
3、It + 动词 + that从句
4、It is + 过去分词 + that从句
用形式主语it引导的主语从句相当多，有些已形成固定的语法和译法。常见的有：
It is said that... 据说……
It is reported that... 据报导……
It is well known that... 众所周知……
It is announced that... 据宣布……
It is believed that... 人们相信……
It is thought that... 人们认为……
It is understood that... 自不待言……
It must be pointed out that... 必须指出……
It must be admitted that... 必须承认……
（二）宾语从句
宾语从句 The Object Clause，在复合句中作主句的宾语，它属于名词性从句。它可以作主句谓语动词的宾语，也可以作介词的宾语。宾语从句以从句的句式来决定连接词。
宾语从句有四步曲
连接词： （也叫引导词）
语序： 从句的词序用陈述语序（主+ 谓）
时态： 主句的时态如果是过去时，从句的时态应以过去时为基础作相应的变化。
人称： 要根据句中的意义作相应的变化
连接词（引导词）
从属连词 that ，if ，whether
连接代词 who， whom， whose， which， what
连接副词 when ，where ，how ，why
1.如果陈述句作从句，连接词用that,在口语和非正式语体中常可省略that 。
2.特殊疑问句作从句，就用原来的特殊疑问词
3.一般疑问句作从句，连词用if或whether 在选择疑问句只用whether，记住这一结构：whether … or not 。
（三）表语从句
表语从句放在连系动词之后，充当复合句中的表语。
A 可接表语从句的连系动词
可接表语从句的连系动词有be, look, seem, sound, appear等。
B as, as if / though引导的表语从句
C because, why引导的表语从句
what引导的主语从句表示结果或名词reason作主语时，后面的表语从句表示原因时要用that引导，不宜用because。
D 使用虚拟语气的表语从句
在表示建议、劝告、命令含义的名词后的表语从句，谓语动词需用"should+动词原形"表示，should可省略。常见的词有：advice, suggestion, order, proposal, plan, idea等。
（四）同位语从句
同位语从句用于对前面的名词作进一步解释，说明名词的具体内容。同位语从句一般由that引导，但也可以由whether以及连接代词和连接副词引导。
A 同位语从句一般跟在名词的后面
同位语从句一般跟在名词fact, hope, idea, news, doubt, suggestion, information, opinion, decision, discovery, truth, promise, statement, problem, rule等后面。
B 使用虚拟语气的同位语从句
在一些表示“建议、命令、要求”的名词后的同位语从句中，谓语动词用"should + 动词原形"，should可省略。
复合句就是包含两个或多个主谓结构，并且，其中一个主谓结构充当主句，另一个或多个主谓结构为从句，充当该主句的主语、表语、宾语、定语或状语，这样的句子叫做复合句。
从句主要分为三类：名词性从句，形容词性从句和副词性从句，
再具体分类：
名词性从句包括：主语，表语，宾语和同位语从句，在复合句中做主，表，宾或同位语；
形容词性从句即定语从句，在复合句中做定语，修饰名词；
副词性从句即状语从句，相应的状语从句的名称即表示相应的意思：时间，地点，原因，结果，目的，条件，方式，让步等。
另外，坚持长句短说的表达方法。
英译汉句子中。有些句子结构复杂，从句中再套有从句，或者是修饰性定语、状语太长。考生翻译此类长句时，首先把复杂长句层层剥离，分成相对独立的分句，然后逐个翻译这些分句，直至把整个句子意义表达出来。
例（1）Researchers have established that when people are mentally，bio-chemical changes occur in the brain that allow it to act more effeetively in cognitive(认知的)areas such as attention and memory.
解析：此句结构较复杂，前that引导宾语从句。宾语从句中又有一个when引导的状语从句，还有一个that引导的宾语从句修饰changes。此外，还有一个such as引导的短语修饰areas。考生若想翻译好此句子，最好用一个个小短句来表达不同部分的意思。参考译文：研究人员己证实，当人们在动脑筋时，头脑里会产生生化变化。这种变化可以使头脑在一些认知领域（如注意力、记忆力领域等）里更加有效地进行活动。
以下将具体讲解一下，供参考：
1. 定语从句常
英译汉中要求巧妙地翻译定语从句是最常见的题型。英语中，定语从句都放在被修辞词后面，考生关键就是把英语原句中的定语从句翻译成带“的”的定语词组，放置于被修饰词之前。此类方法一般叫前置限定的合成翻译法，即把英语的后置定语译在被修饰的名词或代词前。
例（1）We were most impressed by the fact that even those patients who were not told of their serious ill were quite aware of its potential outcome.
解析：此句中有个who引导的定语从句修饰前面的“those patients”,我们要用合成翻译法把who引导的定语从句变成一个前置性定语来修饰“patients”。所以此句话可译为：给我们留下极深印象的是：即使那些没有被告知严重病情的病人， 对其疾病的潜在后果也是非常清楚的。
例（2）Even a skilled writer probably could not describe all the features that make one face different from another.
解析：此句中that引导的定语从句修饰先行词“features”,考生只要用合成翻译法把该定语从句变成一个前置性定语，此句就不难翻译为：即使是老道的作家也很可能不能完全描述出决定人的面孔各不相同的所有特征。
但是，当定语从句较它时，如果翻译成位置的定语，就会不符合汉语表达的习惯。在此种情况下，往往把该定语从句用转换法把翻译成并列的分句或作插入语，放在原来它所修饰词后面。
例（1）They are striving for the ideal which is close to the heart of every Chinese and for which, in the past, many Chinese have laid down their lives.
解析：此句中Which引导的定语从句较它，我们可以用转换法把它译成并列分词。译文为：他们正在为实现这一理想而努力，这个理想是每个中国人内心所珍爱的，在过去，许多中国人曾为它而牺牲了自己的生命。
例（2）Even a skilled writer probably could not describe all the features that make one face different from another.
解析：此句that引导的定语从句也较它。如果考生不能精炼地表达出that后面内容而又把它放在“features”前，就不符合汉语表达方式。此时，考生可用转换法把该从句变成一并列分句。译文为：即使是最老道的作家也很可能描述出全部特征，这些特征能够体现出各人面孔的不同。
2. 宾词从句常
宾词从句一般在句子中做宾语，它总体上也符合汉语主、谓、宾表达方式。而四六级英译汉试题中的宾语从句本身也较容易，没有复杂结构。故此类试题用顺向法即可翻译出，即顺着字面的内容从前向后翻译，也就是通常所指的直译。
例（1）Scientists have reason to think that a man can put up with far more radiation than 0.1 ream without being damaged.
解析：此句话的句子结构很简单，than引导的宾语从句主、谓、宾俱全，more…than是一比较结构，可译成“超过”，without引导的介词短语作状语。全句按字面意思即可译出：科学家有理由认为一个人可以忍受远远超过0.1雷姆的幅射而不受伤害。
例（2）Too often we believe what accounts for other”s success is some special secret or a lucky break(机遇)。But rarely is success so mysterious.
解析：此句句子结构也较简单，“Too often”作状语提前（汉语也有此表达方式），believe后面是一个省略that的宾语从句，但从句的主语又是一个what引导的完整句子。第二句是一个含否定意义的倒装句。但整个句子结构基本符合汉语习惯，故可用顺向法翻译为：我们常常相信别人的成功是由于某种特殊的奥秘或者某种机遇。但成功是很少如此神秘的。
3. 状语部分常考
英语中作状语部分时一从句，有时是介词或连词短语。英语的状语部分位置和汉语中的状语位置有时不同，考生做题时要符合汉语表达方式将它提前。故可采用逆向翻译法，即先译后面内容，再译前面的。
例（1）But for many, the fact that poor people are able to support themselves almost as well without government aid as they did with it is in itself a huge victory.
解析：此句中，重点考的是对“almost as well……as they did with it”部分的翻译。考生首先要分析出句子结构，主语是that引导的同位语从句，谓语是“is”, 宾语“victory”。As well … as 考生可将其调为“as well as they did with it without government”。这样，整个句子各部分分清楚之后，考生翻译时把相应状语提前，整个句子表达就通顺了。译文：但是，对许多人而言，穷人象以往一样在没有政府救济的情况下，生活照样过得很好，这一事实本身就是一个巨大的胜利。
例（2）What easier way is there for a nurse, a policeman, a barber, or a waiter to lose profession identity(身份)than to step out of uniform?
解析：此句只要把“for…,or a waiter” 这个状语提前，整个句子结构就容易看出：for…，wate easier way is there to lose professional identity than to step out of uniform? 所以该句可翻译为：对于一名护士、一名警察、一为理发师或一名侍者而言，还有什么比脱掉制服更加便利的方法能让他们失去职业身份呢？
4.同位语从句常考
同位语从一般都较长，考生先将该从句用顺译法或合成法（视具体情况而定）译成一独立分句，然后前面的先先词视具体情况取舍或巧妙安排。
例（1）We were most impressed by the fact that even those patients who not told of their serious illness were quite aware of its potential outcome.
解析：此句重点考that引导的同位语从句译法，该从句中还套用一个who引导的定语从句。考生可以把that引导的同位语从句单独译成一分句。译文为：给我们留下极深印象的事实是：甚至那些没有被告知严重病情的疾人，对其疾病的潜在后果也是非常清楚的.
例（2）But for many, the fact that poor people are able to support themselves almost as well as without government aid as they did with it is in itself a huge victory.
解析：该句是一个that引导的同位语从句作主语，考生先将that后面内容翻译出来，然后把“the fact”调到后面作is主语。译文为：对许多人而言，穷人象以往一样在没有政府救济的情况下，生活照样过得很好，这一事实本身就是一个巨大的胜利。
5.表语从句译法
四六级英语英译汉中考了一题表语从句译法。一般而言，是将表语从句部分单独译成一个分句。如果表语从句结构复杂，可将复杂结构肢解成简单句子.
例（1）My point is that the frequent complaint of one generation about the one immediately following it is inevitable.
解析：该句表语从句中有一个现在分词后置定语，可用合成法将它放置在先行词one前。其他的可按顺向法译出.
译文：我的观点是，一代人对今跟其后的另一代人的频繁抱怨是不可避免的。
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