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大学英语四级考试从句语法知识
在学习和工作的日常里，我们都可能会接触到考试题，借助考试题可以为主办方提供考生某方面的知识或技能状况的信息。还在为找参考考试题而苦恼吗？下面是小编帮大家整理的大学英语四级考试从句语法知识，欢迎大家分享。
大学英语四级考试从句语法知识 1
I 定语从句
1.先行词为all， anything， something， nothing， everything， much， little， none等不定代词时，关系代词一般只用that，不用which。在大多数情况下that可以省略.
Please tell me everything (that) you know about the matter.
That’s all (that) we can do at the moment.
2.as引出的限制性定语从句
在such … as的结构中as可作关系代词，引出限制性定语从句。有时和same连用，在从句中可作主语、宾语或表语等。
Such people as were recommended by him were reliable.
I’ve never seen such a talented young man as he is.
I have the same trouble as you (have)。
3.as引出的非限制性定语从句
as可作关系代词引出非限制性定语从句，代替整个主句，通常译为“(正)如…一样”，“(正)象…一样”等。as引导的从句一般用逗号与主句隔开，可以位于主句的前面、中间或后面.
I live a long way from work， as you know.
She did not， as her friend had feared， break down.
As is generally accepted， economic growth is determined by the smooth development of production.
4.分隔式定语从句
定语从句一般紧跟在先行词之后，但有时会被其他句子成分与先行词隔开，从而构成分隔式定语从句。
The days are gone when power politics worked.
A new teacher will come tomorrow who will teach you French.
5.介词+关系代词(which/whom等)引出的定语从句
如果关系代词(which/whom等)在定语从句中作介词的宾语，那么这个介词可以提到从句前，构成“介词+关系代词(which/whom等)+定语从句”。在这种结构中关系代词不可以用that。
This is a subject about which we might argue for a long while.
The four travelers with whom I shared the room were pleasant people.
6.关系代词在限制性定语从句中常可以省略，一般有以下几种情况：
1) 关系代词在从句中作直接宾语时，在大多数情况下可以省略。
This is something (that) you must always keep in mind.
The man (whom) you just met is our manager.
关系代词作介词宾语时，介词位于句尾时关系代词可以省略;介词位于关系代词之前时则关系代词不能省略。
This is the room (which) Churchill was born in.
This is the room in which Churchill was born.(which不可省略)
2) 关系代词作主语时一般不能省略，但如果关系代词在由there … be存在句构成的定语从句中作主语时常可省略。
This is the only book (that) there is on this subject.
The old professor made full use of the time (that) there was left to him to continue his research.
3) 在way后面的'定语从句中in which或that通常省略。
That’s the way (that/in which) I look at it.
I don’t like the way (that/in which) you laugh at her.
7.非限制性定语从句
非限制性定语从句修饰先行词或整个主句，起补充说明的作用，如果省略掉，原句句意仍保持完整。非限制性定语从句要用逗号与主句隔开，其引导词不能用that。非限制性定语从句属于正式语体。经常考到的非限制性定语从句有以下三种。
1)由which、as引导的非限制性定语从句。which、as代表整个主句。
He said that he had never seen her before， which was not true.
China is still a developing country， which is known to all of us.
2)由 “介词+关系代词”引导的非限制性定语从句。
He sent her a letter， in which he said that he was sorry for what he had done to her.
He failed to pass the exam， because of which his parents scolded him.
4) 由 “数词、代词或名词+of +关系代词”引导的非限制性定语从句。
He had three sons， one of whom was my son’s classmate.
There are about twenty students in this course， most of whom are freshmen.
They are two different words， the spellings of which are easily confused.
Ⅱ 状语从句
状语从句中以下四种从句考得较多，这里给予简单介绍。
1) 时间状语从句
时间状语从句主要由以下连词引导：when， whenever， as， while， since， until， till， before， after， as soon as， once， hardly (scarcely) … when， no sooner … than。
I will discuss the matter with you when we meet tomorrow.
He didn’t go to sleep until he finished doing his homework.
You have changed a lot since we met last time.
时间状语从句还可由某些可充当连词的名词(the moment， the instant， every time，等)和副词(instantly， directly等)引导：
I will tell you the news the instant I know.
Directly the teacher came in everyone was quiet.
Note：
①before除了可表示 “在…之前”外，还可用来强调主句所表达的时间、距离很长或花费的力量相比较大，可译为“…才”。(“not … before” 可用来强调主句所表达的时间、距离很短或花费的力量相比较小，可译为“…就”)。
It was a long time before I got to sleep again.
They had not been married a month before they quarreled.
②如果位于when引导的分句之前的主句使用过去进行时、过去完成时或“was/were about to， was/were on the point of”等结构时，when表示突然发生某事，可译为“正在…突然”或“刚…就”等。这时，不能够用as或while来代替when。
I was walking on the street when I ran into my old friend John.
She had just fallen asleep when the telephone rang.
We were about to leave when it began to rain.
2) 条件状语从句
条件状语从句主要由以下连词引导：if， unless， providing/provided (that)， suppose/supposing (that)， on condition (that)， as/so long as， in case等。
So long as you work hard， you will surely achieve good results in examinations.
I shall return next Thursday unless something unexpected happens.
I will go provided that you go with me.
Please give this letter to John in case he comes.
3) 让步状语从句
让步状语从句主要由以下连词引导：though， although， even if， even though， whatever， however， whoever， wherever， no matter how/ what/ where/ when等。以下介绍几种较特殊的让步状语从句。
(1)while引导的让步状语从句多放在句首，while相当于although，表示“尽管”，“虽然”。
While I admit I did it， I didn’t intend to.
While I understand what you say， I can’t agree with you.
(2)短语“even now/then/so”相当于“though it is/was true”，表示“尽管如此”，“尽管这样”。
The fire was out， but even so， the smell of smoke was strong.
I’ve tried my best， but even now/then she is not satisfied.
(3) as引导的让步状语从句要倒装。
Child as he was， he could speak four languages.
Hard as she tried， she failed to get the job.
4) 比较状语从句
比较状语从句主要由以下连词引导：(not) as … as， (not) the same as， (not) such … as， not so … as， than， the + 比较级…， the +比较级…等。
We have had a lot more rainfall this year than we had last year.
She can speak English as fluently as her teacher (can)。
Ⅲ 宾语从句
1) 及物动词后的宾语从句
有些动词的宾语从句前还可有一个间接宾语。
I remember that we have learned this word before.
I don’t understand what you have said.
She asked the teacher how she could learn English well.
2) 介词的宾语从句
It depends on whether you want to do it or not
There is disagreement among economists about what money is and how money is measured.
Note： 在介词in后面跟that引导的宾语从句中，in that可看成是一个固定的搭配，表示“因为”或“在…方面”。
The evidence is invalid in that it was obtained through illegal means.
A turtle differs from all other reptiles in that it has its body encased in a protective shell of its own.
大学英语四级考试从句语法知识 2
方式状语从句
方式状语从句通常由as, (just) as…so…, as if, as though引导。
1) as, (just) as…so…引导的方式状语从句通常位于主句后，但在(just) as…so…结构中位于句首，这时as从句带有比喻的含义，意思是"正如…"，"就像"，多用于正式文体，例如：
Always do to the others as you would be done by.
你希望人家怎样待你，你就要怎样待人。
As water is to fish, so air is to man.
我们离不开空气，犹如鱼儿离不开水。
Just as we sweep our rooms, so we should sweep backward ideas from our minds.
正如打扫房屋一样，我们也要扫除我们头脑中落后的东西。
2) as if, as though
两者的意义和用法相同，引出的状语从句谓语多用虚拟语气，表示与事实相反，有时也用陈述语气，表示所说情况是事实或实现的.可能性较大。汉译常作"仿佛……似的"，"好像……似的"，例如：
They completely ignore these facts as if (as though) they never existed.
他们完全忽略了这些事实，就仿佛它不存在似的。(与事实相反，谓语用虚拟语气。)
He looks as if (as though) he had been hit by lighting.
他那样子就像被雷击了似的。(与事实相反，谓语用虚拟语气。)
It looks as if the weather may pick up very soon.
看来天气很快就会好起来。(实现的可能性较大，谓语用陈述语气。)
说明：as if / as though也可以引导一个分词短语、不定式短语或无动词短语，例如：
He stared at me as if seeing me for first time.
他目不转睛地看着我，就像第一次看见我似的。
He cleared his throat as if to say something.
他清了清嗓子，像要说什么似的。
The waves dashed on the rocks as if in anger.
波涛冲击着岩石，好像很愤怒。
大学英语四级考试从句语法知识 3
让步状语从句
though, although
注意： 当有though, although时，后面的从句不能有but，但是 though 和yet可连用
Although it‘s raining, they are still working in the field.
虽然在下雨，但他们仍在地里干活。
He is very old, but he still works very hard.
虽然他很老，但仍然努力地工作。
Though the sore be healed, yet a scar may remain.
伤口虽愈合，但伤疤留下了。 (谚语)
典型例题
1) ___she is young, she knows quite a lot.
A. When B. However C. Although D. Unless
答案：C。意为虽然她很年轻，却知道许多。
2) as, though 引导的'倒装句
as / though引导的让步从句必须表语或状语提前(形容词、副词、分词、实义动词提前)。
Child as /though he was, he knew what was the right thing to do.
= Though he was a small child, he knew what was the right thing to do.
注意： a. 句首名词不能带任何冠词。
b. 句首是实义动词，其他助动词放在主语后。如果实义动词有宾语和状语，随实义动词一起放在主语之前。
Try hard as he will, he never seems able to do the work satisfactorily.
= Though he tries hard, he never seems…
虽然他尽了努力，但他的工作总做的不尽人意。
3) ever if, even though. 即使
We‘ll make a trip even though the weather is bad.
4) whether…or- 不管……都
Whether you believe it or not, it is true.
5) "no matter +疑问词" 或"疑问词+后缀ever"
No matter what happened, he would not mind.
Whatever happened, he would not mind.
替换：no matter what = whatever
no matter who = whoever
no matter when = whenever
no matter where = wherever
no matter which = whichever
no matter how = however
注意：no matter 不能引导主语从句和宾语从句。
(错)No matter what you say is of no use now.
(对)Whatever you say is of no use now.
你现在说什么也没用了。(Whatever you say是主语从句)
(错)Prisoners have to eat no matter what they‘re given,
(对)Prisoners have to eat whatever they‘re given. 囚犯们只能给什么吃什么。
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