如何理解从句?TwitterFox is a Firefox extension that notifies you of your friends' statuses of Twitter.有人说这句话that后面的是一个从句,那世界上这么多句子中如何才能知道什么是从句呢?从句应该如何理解?tha

如何理解从句?TwitterFox is a Firefox extension that notifies you of your friends' statuses of Twitter.有人说这句话that后面的是一个从句,那世界上这么多句子中如何才能知道什么是从句呢?从句应该如何理解?tha
如何理解从句?
TwitterFox is a Firefox extension that notifies you of your friends' statuses of Twitter.
有人说这句话that后面的是一个从句,那世界上这么多句子中如何才能知道什么是从句呢?
从句应该如何理解?
thanks

如何理解从句?TwitterFox is a Firefox extension that notifies you of your friends' statuses of Twitter.有人说这句话that后面的是一个从句,那世界上这么多句子中如何才能知道什么是从句呢?从句应该如何理解?tha
从句一般都是用来修饰前面的,有些起补充说明的用处.从句也分很多种,有表语从句,定语从句,宾语从句,状语从句（时间、地点,原因、让步）

从句分很多种，这是定语从句~这应该要看语感~还有先行词

只要后面的that,which等词是前面某个单词的重复，那么这就是个定语从句。

一般来说，英语中一个句子只能有一个谓语，如果出现两个谓语，那么其中一个谓语只能是以从句的形式或并列句或非谓语动词的形式出现。所谓从句是指从属于主句的句子，由从属连词连接。从句的种类有很多，但根据其性质和作用可以分为：名词性从句，形容词性从句（即定语从句），副词性从句（即状语从句）三大类。
一、名词性从句：即从句在整个句中起名词作用，分别可以作主语、宾语、表语、同位语等，所以这类从句包括主...

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一般来说，英语中一个句子只能有一个谓语，如果出现两个谓语，那么其中一个谓语只能是以从句的形式或并列句或非谓语动词的形式出现。所谓从句是指从属于主句的句子，由从属连词连接。从句的种类有很多，但根据其性质和作用可以分为：名词性从句，形容词性从句（即定语从句），副词性从句（即状语从句）三大类。
一、名词性从句：即从句在整个句中起名词作用，分别可以作主语、宾语、表语、同位语等，所以这类从句包括主语从句、宾语从句、表语从句和同位语从句。
考点一：主语从句：
1. That the earth goes around the sun is well-known to everybody. ( = It is well-known to everybody that the earth goes around the sun. )
2. Whether he will come to the meeting is up to his boss. （此时不能用if ）
3. Who will come to the dinner remains a question.
4. What you have said is convincing.
5. How the ancient Egyptians built the pyramids puzzled people for centuries.
6. Why the murderer came back to the scene of crime is a psychological problem.
主语从句的一些常见句型：
It is reported that…
It must be pointed out that …
It is likely that …
It is a good thing that…
It happens that …
考点二：宾语从句：
1 He believed that walking under a ladder brings bad luck.
2. We can learn what we do not know from TV programs.
3. Tell me which of the books is the right one.
4. Your success will depend on how you present yourself.
5. I wonder if/whether you can help me.
考点三：表语从句：
1.The assumption is that things will improve.
2. China is not what it used to be.
3. The doctor’s dilemma is whether he should tell a lie to the patient.
考点三：同位语从句：
同位语从句的特点是由一个抽象名词+that从句构成，引导词一般是that, 而且that在从句中不充当任何成分。这些抽象名词有：news, idea, fact, doubt, evidence, promise, rumor, hope, truth, belief, message等，同位语从句是对抽象名词进行说明解释。
1. The news that our football team at last defeated Korea made the fans wild with joy.
The news that made the fans wild with joy was from the radio.（比较－定语从句）
2. There is much evidence that the crime rate in this city is on the rise.
3. Einstein came to the conclusion that the maximum speed possible in the universe is that of light. 爱因斯坦得出的结论是宇宙中最大速度是光速。
二、形容词性从句（即定语从句）：
定语从句主要用来修饰它前面的先行词（名词或代词）的从句，所以又称形容词从句。根据与先行词的关系，定语从句可分为限制性定语从句和非限制性定语从句。定语从句主要考查引导定语从句的关系代词和关系副词；介词＋引导词以及非限制性定语从句。具体考点如下： 考点
一：引导定语从句的引导词有关系代词（who, whom, which, that, whose）和关系副词(as, when, where, why)等。但是当下列情况出现时，引导词有特殊要求。
1. 当先行词是all, everything, nothing, something, little, much时； 当先行词被all, no, some, any, every, a few, a little, much, only, very修饰时；当先行词被序数词或形容词最高级修饰时，定语从句的引导词用that。例： All that you want are here. There is no person that doesn’t make mistakes.没有人不犯错误。 This is the best film that I have ever seen.
2. “The same ...as”, “such...as” 中的as 可以指人或物。例： Such furniture as is very popular is expensive. We have successfully done the same experiment as you did.
3. why引导表示原因的定语从句，其先行词一般是reason。当主句主语是reason时， 作主句表语的成分不能有because和because of 。其结构一般为the reason why…is that… 或者 the reason that … is that… 如： He did not tell us the reason why he was late again. The reason why （ that）he didn't come is that he was ill.
4. 当定语从句为there be 句型时，关系代词只能用that. This is the fastest train that there is to Beijing.
5. 当主句是以which 或 who 开头的特殊疑问句时，关系代词只能用 that. Who is the girl that is talking with Mr.Brown.
6. 如果出现两个或两个以上的先行词，并同时兼指人和物时，关系代词用that. We are talking about the people and countries that we have visited
考点二：在“介词+which/whom”的结构中，介词的选择取决于三种情况：
1. 定语从句中谓语动词或表语的搭配； This is the college in which I am studying.
He is the man about whom we are talking.
2. 先行词与介词的习惯搭配；
当先行词表示 “领域、方面”时，如：aspect, respect, area, field等就用 in which；
当先行词表示“价格、利率、速度”时，如：rate, price, speed 等就用at which；
当先行词表示“程度”时， 如： degree, extent等就用 to which；
当先行词表示“根据、依据、基础”时，如：grounds, foundation, basis等就用 on which；
The speed at which the machine operates is shown on the meter.
It is useful to be able to predict the extent to which a price change will affect supply and demand.
仪表上显示出这台机器的运转的速度。
3. 当定语从句为最高级时 只能用of which; 否则用其他介词
I have five dictionaries of which Longman Dictionary is the best.
I have five dictionaries among which Longman Dictionary is published in UK
注意：不可拆分的动词短语介词不能提前，如put up with；有的短语可能有不同的介词搭配，此时需要根据上下文来确定。如：be familiar with / to ; compare with / to .
考点三：当先行词为表示时间的名词（如：time, day, year, week, month, occasion）或地点的名词（如：place, room, city, country）时，一般用关系副词 when 和 where. 分别相当于in which, at which, on which。但是当这些表示时间或地点的名词作从句的宾语时，则要用关系代词that 或which.
I can't forget the days when(in which) I lived with you.
Can you tell me the day when(on which)the first satellite was sent into space?
China is the only country where(in which ) wild pandas can be found.
I’ll never forget the village where I spent my childhood. I will never forget the days that (which) I spent in Beijing University.
(本句days 作spend 的宾语，故用关系代词that / which )
I have never been to Beijing, but it’s the place that I most want to visit.
( 本句place 作visit 的宾语。)
考点四：非限定性定语从句不能用that引导, 一般用引导词which/as或who（指人），非限定性定语从句既可以修饰主句的部分内容，也可修饰主句的全部内容。as引导的非限定性定语从句既可以放在主句之前，也可以放在主句之后，但which或who引导的非限定性定语从句不能放在主句句首。
As we all know, the moon is a satellite of the earth.
The large area is covered with thick snow, which affects people's life greatly. His speech, which bored us to death, was over at last. Her sister, who lived in another city, was coming to visit her.
三、状语从句
状语从句主要用来修饰主句或主句的谓语。一般可分为九大类，分别表示时间、地点、原因、目的、结果、条件、让步、比较和方式。尽管种类较多，但由于状语从句与汉语结构和用法相似，所以理解和掌握它并不难。状语从句的关键是要掌握引导不同状语从句的常用连接词和特殊的连接词即考点。现分别列举如下:
1． 时间状语从句
常用引导词：when, as, while, as soon as, while, before, after, since , till, until 特殊引导词：the minute, the moment, the second, every time, the day，the instant, immediately, directly, no sooner … than, hardly …when, scarcely … when
I didn’t realize how special my mother was until I became an adult.
While John was watching TV, his wife was cooking.
The children ran away from the orchard(果园) the moment they saw the guard.
No sooner had I arrived home than it began to rain.
Every time I listen to your advice, I get into trouble.
2． 地点状语从句
常用引导词：where
特殊引导词：wherever, anywhere, everywhere
Generally, air will be heavily polluted where there are factories.
Wherever you go, you should work hard.
3． 原因状语从句
常用引导词：because, since, as, since
特殊引导词：seeing that, now that, in that, considering that, given that, considering that, inasmuch as, insomuch as
My friends dislike me because I’m handsome and successful.
Now that everybody has come, let’s begin our conference.
The higher income tax is harmful in that it may discourage people from trying to earn more.
Considering that he is no more than 12 years old, his height of 1.80 m is quite remarkable.
4． 目的状语从句
常用引导词：so that, in order that
特殊引导词：lest, in case, for fear that，in the hope that, for the purpose that, to the end that
The boss asked the secretary to hurry up with the letters so that he could sign them.
The teacher raised his voice on purpose that the students in the back could hear more clearly.
5． 结果状语从句
常用引导词：so … that, so… that, such … that,
特殊引导词：such that, to the degree that, to the extent that, to such a degree that
He got up so early that he caught the first bus.
It’s such a good chance that we must not miss it.
To such an degree was he excited that he couldn’t sleep last night.
6． 条件状语从句
常用引导词：if, unless,
特殊引导词：as/so long as, only if, providing/provided that, suppose that, in case that, on condition that
We’ll start our project if the president agrees.
You will certainly succeed so long as you keep on trying.
Provided that there is no opposition, we shall hold the meeting here.
7． 让步状语从句
常用引导词：though, although, even if, even though
特殊引导词： as（用在让步状语从句中必须要倒装），while ( 一般用在句首 )，no matter …, in spite of the fact that, while, whatever, whoever, wherever, whenever, however, whichever
Much as I respect him, I can’t agree to his proposal. 尽管我很尊敬他， 我却不同意他的建议。
The old man always enjoys swimming even though the weather is rough.
No matter how hard he tried, she could not change her mind.
He won’t listen whatever you may say.
8． 比较状语从句
常用引导词：as（同级比较）, than（不同程度的比较）
特殊引导词：the more … the more … ; just as …, so…; A is to B what /as X is to Y; no … more than; not A so much as B
She is as bad-tempered as her mother. The house is three times as big as ours.
The more you exercise, the healthier you will be.
Food is to men what oil is to machine. 食物之于人，犹如油之于机器。
9． 方式状语从句
常用引导词：as, as if, how
特殊引导词：the way
When in Rome, do as the Roman do.
She behaved as if she were the boss.
Sometimes we teach our children the way our parents have taught us.

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