英语的三大从句语法讲解
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精彩文档英语三大从句
在英语中，主要有三大从句，即名词性从句（包括主语从句，宾语从句，表语从句，同位语从句）、形容词性从句（即定语从句）、副词性从句（即状语从句,包括时间、条件、结果、目的、原因、让步、地点、方式等）。
定语从句
一、关系代词引导的定语从句
关系代词代替前面的先行词，并且在定语从句中充当句子成分，可以作主语、宾语、定语等。常见的关系代词有：who, that, which。它们的主格、宾格和所有格如下表所示：
先行词主格宾格所人 who whom whose 物 which which \ 人或物 that
that
\
（一）关系代词who, whom和 whose的用法
who代替人，是主格，在定语从句中作主语。
An architect is a person who designs buildings. 建筑师是设计房屋的人。
whom代替人，是宾格，在定语从句作宾语，在非正式英语常可省略。
Do you know the gentleman whom we met in the school library yesterday? 昨天我们在学校图书馆里遇到的那位先生你认识吗？
whose一般代替人，有时亦可代替物，是所有格，在定语从句作定语。
The girl student whose father is a senior engineer used to study abroad. 其父是一位高级工程师的那个女学生过去在国外留学。
Do you know the name of the hotel whose window we can see here? 我们这儿能看到窗户的那个宾馆叫什么名字，你知道吗？（关系代词whose指代先行词hotel，正式用法应该用of which。whose window=the window of which，意思是：the window of the hotel。）
（二）关系代词which的用法
which代替物，在定语从句作主语或宾语，作宾语时还可省略。
I do not like stories which have unhappy endings. 我不喜欢有不幸结局的小说。（which可以换成that）
（三）关系代词that的用法
that既可指人又可指物，在当代英语中大多指物，在定语从句作主语或宾语，作宾语时还可省略。： Is she the girl that sells newspapers? 她是卖报纸的那个女孩吗？（that可以换成who）
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精彩文档Where is the ice-cream that was in the fridge? 放在冰箱的冰激凌哪儿去了？（that可以换成which）
Is this the book that you want to buy?
这是你要买的那本书吗？（that可以换成which，在定语从句作宾语，还可以省略）二、关系副词引导的定语从句
常用的关系副词只有三个：when, where, why，在定语从句中充当时间、地点和原因状语。
（一）关系副词when的用法
关系副词when代替的先行词表示的是时间，when在定语从句作时间状语。
In Beijing July and August are the months when it rains very often. 北京的七月和八月是常下雨的月份。（when先行词是months）
（二）关系副词where的用法
关系副词where代替的先行词表示的是地点，where在定语从句作地点状语。
During the Spring Festival I went back to the town where I was brought up. 春节期间，我回到了生我养我的家乡。（where的先行词是town）
（三）关系副词why的用法
关系副词why代替的先行词表示的是原因，why在定语从句作原因状语。
The reason why I am phoning you is to ask you whether you have got my email. 我打电话给你的原因是想问问你是否收到了我的电子邮件。（why先行词是reason，当代英语里why可以用that替代，这时关系代词that就变成了表示原因的关系副词，还可以将why省略）
三、特殊关系代词as引导的定语从句
（一）在固定搭配as…as, so…as, such…as, the same…as中，as引导定语从句You may take as many books as you want. 你想要拿多少书就拿多少。（第一个as是副词，修饰many的；第二个as才是关系代词，代替先行词books，在定语从句中作宾语）
（二）独立于主句之外，as引导定语从句
As we know/ As is known to us, the earth turns around the sun. 正如我们所知，地球围绕太阳旋转。
（As we know和 As is known to us均为定语从句，as分别作宾语和主语，替代后面的主句。）
Taiwan is, as you know, an inseparable part of China. 你知道，台湾是中国不可分割的一部分。（关系代词as指代整个主句，在定语从句中作宾语。）
四、关系代词who, which与that的区别
（一）关系代词who与that的区别
1. 当关系代词用作主语时，多用主格who。He who loses hope loses all. 失去希望的人就失去一切。（先行词为代词he, they, any, all, one等时，多用who）
I met Alice, who told me that she was learning Chinese. 我遇见艾丽斯，她告诉我她在学汉语。（在非限制性定语从句中，用who）
2. 当关系代词用作介词后的宾语时，用宾格whom，不用that。
The man to whom our headmaster talked just now is our English teacher. 我们校长刚才与他谈话的那个人是我们的英语老师。（介词与关系代词紧密相连时，只能用宾格whom，不可用主格who）
注意：介词与关系代词不是紧密相连时，或者说介词放在句子后面时，这时可以用主格
who，也可用that，还可以省略关系代词。因此，上面的这句话还可以有如下四种说法：实用标准文案
精彩文档(1) The man whom our headmaster talked to just now is our English teacher.
(2) The man who our headmaster talked to just now is our English teacher. (3) The man that our headmaster talked to just now is our English teacher. (4) The man our headmaster talked to just now is our English teacher. 3. 当关系代词泛指人时，多用that。
He is a man that is never afraid of failure. 他是个从不怕失败的人。（that用来泛指人）
4. 当关系代词出现在who开头的疑问句时，应用that。例如：
Who is the girl that is talking to Tom in English?
用英语同汤姆交谈的那个女孩是谁？（避免重复使用who，以免造成误解或语义含混不清）
（二）关系代词which与that的区别
1. 当先行词为all, much, little以及不定代词anything, something, everything 等时，关系代词多用that。
All that glitters is not gold. 闪闪发光物，未必尽黄金。
She told me everything that she knew. 她把她所知道的一切都告诉了我。
2. 当先行词的前面有形容词最高级、序数词或限定词the only, the very, all, every, any, no等时，关系代词一般都用that。
This is the best novel that I have ever read. 这是我读过的最好的一部小说。He is the only person that has been invited to the ball. 他是惟一应邀参加舞会的人。
3. 当关系代词出现在which开头的疑问句时，应用that。
Which was the hotel that was recommended to the foreign guest? 哪一个是推荐给外宾的宾馆？（这里使用that很明显是为了避免重复which）
4. 在非限制性定语从句中，关系代词一般只用which。
Beijing, which is the capital of the People's Republic of China, will host the 2008 Olympic Games. 北京是中华人民共和国的首都，将主办2008年奥运会。
5. 介词后的关系代词用which，而不用that。
She has collected 600 stamps, 60% of which are German stamps. 她收集了600张邮票，其中60％是德国邮票。
五、定语从句的位置
如前所述，定语从句一般总是直接置于所修饰的名词或代词之后。有时候，定语从句与先行词之间插入了其他的短语，这样它们被分隔了，这种情况下的定语从句被称作隔离定语从句。
There was a girl upstairs who was shouting and crying, obviously mad. 楼上有一个女孩，大喊大叫。很明显，她疯了。（定语从句who was shouting and crying修饰the girl，被upstairs所隔开）
A new master will come tomorrow who will teach you German. 明天要来一位新老师教你们德语了。（定语从句置于句末以示强调）
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精彩文档名词性从句
宾语从句
一、引导词
（1）由that 引导的陈述句性的宾语从句，在很多动词如say, think, wish , hope, see, believe, agree, expect, hear , feel等动词后。连词that
只起连接作用，在从句中不做句子的成分，也无词汇意义，在口语中常被省略。如：I told him that he was wrong.
在think, believe, suppose, expect等动词引起的宾语从句中，有时谓语尽管是否定意义，却不用否定形式，而将think 等动词变为否定形式。（见语法：否定转移）
如：I don't think you are right. (我认为你做的不对)
在许多带有复合宾语的句子中，that引导的宾语从句经常移到句子的后面，而用it做形式宾语。
We think it wrong that he told a lie to everyone (我认为他向每一个人撒谎是错误的) （2）由连词if、 whether 引导的表示“是否…”的宾语从句。
Whether, if 在从句中不做句子的成分，一般情况下，whether和if 可以替换。
I don't know if/whether he will come tomorrow. 在介词后面的宾语从句中不用if 引导
Everything depends on whether we have enough money. 宾语从句中有or not时不用if引导.
I don't know whether the movie star will come or not. 和不定式连用作宾语时不用if引导
Whether to go there or not hasn't been decided.
（3）由wh-引导的宾语从句。连接代词who, whom, whose, what, which和连接副词when, where, why, how 等连接的宾语从句，它们在句中即有连接从句的作用，又在句中充当句子的成分。
Do you know which film they are talking about? (which做定语) I don't know where he lives. (where 做地点状语) 二、宾语从句的语序，
宾语从句的语序必须是陈述语序，既连接词+主语+谓语+其他成分 I believe that they will come soon.
特例：有下列常见的问句，作为从句出现，是“不改变语句顺序”的。
1. What's the matter?
2. What's wrong?
3. What's up？
4. What's the problem?
5. What's your trouble? 三、宾语从句的时态。
宾语从句的时态受主句的限制，即：
主句是一般现在时态，从句根据实际情况而定；主句是
一般过去时态，从句用相应的过去的时态。如果从句的动作发生在主句之前，则从句要用过
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精彩文档去完成时态。
1) She says that she is a student.→ She said that she was a student.
2)She says that she will fly to Japan in a week. → She said that she would fly to Japan in a week.
3)She says that she has finished her homework already. → She said that she had finished her homework already.
（1）如果宾语从句说的是客观真理、自然现象或事实时，这时宾语从句要用一般现在
时态。
The teacher said that the earth goes round the sun.
（2）Could you tell me…是用来征询对方的意见，语气委婉，并不表示过去。
Could you tell me when we will visit the History Museum? 注意事项：
（3）由陈述句变成宾语从句时，要注意人称的变化。
She said: “I have been to England before.”→ She said that she had been to England before.
She asked me: “Do you like maths?”→ She asked me if I liked maths. （4）宾语从句与简单句的交换。
由连接代词和连接副词引导的宾语从句，如果宾语从句的主语和主句的主语是同一个人时，可以用“疑问词+不定式”做宾语的简单句结构。
I don't know what I should do next. → I don't know what to do next.
DO SOME EXERCISES:
1.Can you see A?
A. what he's reading
B. what is he reading
C. what does he read
D. he reads what
2. Does Jack come from Japan? Do you know?(合并成一个句子) Do you know
___that__Jack __come___from Japan? 3._What did your son say in the letter? _He told me that he_D__ the Disney the next day. A. will visit B. has visited C. is going to visit D. would visit 4. He didn't know___A____
A. what's the matter
B. what the matter is
C. what was the matter
D. what the matter was
5. Somebody called you just now, but I didn't know__D__ A. who were they B. who they were C. who was it D. who it was
6. I want to know___D__
A. what is his name
B. what's his name
C. that his name is
D. what his name is
7. ---Could you tell me __C__she is looking for? ---Her cousin, Susan.
A. that
B. whose C .who D. which
8. ---What are you searching the Internet for? ---I'm trying to find out____. 实用标准文案
精彩文档A. What is the difference between SARS and BIRDFLU B. How many persons have died in Iraq C. How to protect our environment
D. Why is our Chinese team be able to beat Korea
同位语从句
（一）一般来说，在主从复合句中，用作同位语的从句叫同位语从句。它通常跟在某些名词之后，用以说明或解释该名词表示的具体内容。可以跟同位语从句的名词通常有：
advice, decision, fact, hope, idea, information, message, news, promise, proposal, reply, report, suggestion, word（消息），problem， question, doubt, thought等。
eg: They were delighted at the news that their team had won. 当听到他
们队获胜的消息时，他们欣喜若狂。
有时同位语从句可以不紧跟在被说明的名词后面，而被别的词隔开。如：
The thought came to him that Tom might have returned the book. 他突然想起汤
姆可能已经还了书了。
（二）引导词
1. The news that Mr. Li will be our new English teacher is true.
2. He hasn't made the decision whether he will go there.
3. The question who should do the work is being discussed at the meeting.
4.
I have no idea what the boy is doing in the next room now. 5. We haven't yet settled the question where we are going to spend our summer vacation this year.
6. I have no idea how I can get to the railway station.
7. I have no idea when he will be back．．
小结：① that引导同位语从句时无词义，也不充当任何成分，但通常不可以省略，
如句1；
② whether引导同位语从句时意为“是否”，通常不能用if来代替, 如句2; ③连接
代词who, what等可以引导同位语从句，如句3， 4；
④连接副词where, how, when等可以引导同位语从句，如句5，6，7。
(三) that 引导的同位语从句和定语从句
①意义不同：同位语从句用来进一步说明前面名词的内容；而定语从句用来修饰、限
定前面的先行词。试比较：
1. The news that our team has won the final match is encouraging.
2. The news that you told us is really encouraging.
② that的功能不同：that引导同位语从句时是一个纯连词，不充当任何成分；而引导定语从句时，不仅起连接作用，而且还指代先行词并在从句中充当主语、宾语等成分。试比较：
1. Dad made a promise that he would buy me a CD player if I passed the English test.
2. Dad made a promise that excited all his children.
③可否省略：that在引导同位语从句时，通常不可省略。在引导定语从句时，若在从句中作宾语，通常可以省略，若作主语则不可以省略。
DO SOME EXERCISES:
实用标准文案
精彩文档I. 请用适当的词填空，使下列句子意思完整。
1. They expressed the hope _that_ they would come over to China soon.
2. The fact ___that____ he didn't see Tom this morning is true.
3. Word has come __where_____ some American guests will come to our college for
a visit next week.
4. He can't answer the question ___how____ he got the money from his home
yesterday.
5. Do you have any idea __what___ is actually going on in the classroom?
6. The problem _______ we should have the meeting in the hall now must be decided at once.
II. 下列各句中均有一处错误，请改正。
1. Our team has won the game, that made us very happy.
2. I've come with a message from Mr Wang how he won't be able to see you this afternoon.
3. He must answer the question if he agrees with what she said or not.
4. I've read the book where you gave me the day before yesterday.
5. One of the men held the opinion when what the book said was right.
表语从句
表语从句只能置于主句之后，而主句的动词只能是连系动词。名词性从句在be等系动词后作表语时被称为表语从句
The problem is how we can get the things we need.问题是我们怎样能弄到我们需要的东西。(how 在表语从句中充当方式状语)
The scissors are not what I need. 这把剪刀不是我所需要的。(what 在表语从句中充当宾语)
What I told him was that I would find him a good play. 我告诉他的是我会给他找个好剧本。(what在主语从句中作直接宾语， that作为表语从句的引导词在该表语从句中不充当句子成分，不能省略) That is what I want to tell you.那就是我想要对你讲的。(what在表语从句中充当直接宾语)
That is why she failed to pass the exam. 那就是她考试不及格的原因。(why 在表语从句中充当原因状语) “That is why...”是常用句型，意为“这就是……的原因/因此……”，
其中why引导的名词性从句在句中作表语，该句型通常用于针对前面已经说明过的原因进行总结
下面是两个与“That is why...”形式相似的结构，它们与“That is why...”结构之间的关系要能够辨析清楚：
(1)“That is why...”与“That is the reason why...”同义，只不过从语法结构上讲，
“That is the reason why...”中why引导的是—个定语从句，将其中的the reason去掉则与“That is why...”结构一样 That is (the reason) why I cannot agree. (2)“That is because...”句型中从属连词because
引导的名词性从句在此作表语，这也是个常用句型，意为“这就是为什么……/因为……”。“That is because...”与“That is why...”之间的不同在于“That is because...”指原因或理由，“That is why...”则指由于各种原因所造成的后果
He did not see the film last night. That is because he had to help his little sister with her homework.昨天晚上他没有去看电影，那是因为他得帮助他的妹妹做作业。
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精彩文档(第一句话说明结果，第二句话说明原因)