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从句确实需要好好学~~
一直以来都是凭语感做题的~~
估计一下也改不了,语法错误也只能在习作中发现,改进了
HOWEVER
从句结构和规律还是要好好学习的
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从句
名词性从句
1. 主语从句可直接位于主语的位置,如果从句较长,谓语又较短,可用it作形式主语,而将从句放在句末。常见的句型有:
*It is a fact\a pity\a question\good news that...
*It seems\appears\happened\has turned out that...
*It is clear\important\likely\possible that...
*It is said\reported\estimated\has been proved that...
2. what引导的主语从句表示“...的东西时”,一般不用it作形式主语。
What we lack is experience.
3. what, who, when, why, whether等词含有各自的疑问意义,但它们引导的主语从句,都用陈述语序。
How the plan is to be carried out should be discussed again.
宾语从句
1. 宾语从句可位于及物动词、介词和某些形容词后。连词that常可省略。介词后一般接疑问词引导的宾语从句。in that(因为),except that(除了),but that(只是)已构成固定搭配,其他介词后一般不接that引导的宾语从句。
He is certain that watching so much television is not good for children.
This article is well-written except that it is a bit too long.
2. 宾语从句后如有宾补,要用形式宾语it来代替,而把宾语从句移至宾补之后。
He has made it clear that he would not change his mind.
3. 在think, believe, suppose, expect等动词后的宾语从句中,如果谓语是否定的,一般将否定词移至主句谓语上,宾语从句则变成肯定形式。
He didn't think that the money was well spent.
表语从句
表语从句出现在结构为“主语+系动词+表语从句”的句子中。表语从句除可用that, what, when, why, whether, how等引导外,还可由because, as if(though)等引导。that常可省略。如主句主语为reason,只能用that引导表语从句,不可用because.
Perhaps the most important thing to remember is that there is no one common type of life in America.
同位语从句
同位语从句用于对前面出现的名词作进一步说明,一般用连词that引导,由于先行名词的意义不同,也可用whether, who, when, where, what, why, how等引导。常见的先行名词有fact,idea,belief,news,hope,conclusion,evidence,suggestion,order,problem,report,decision.
I had no idea how many books I could borrow at a time.
有时由于谓语较短,将同位语从句位于谓语之后。
The news came that their team had won the championship.
用it作形式主语的that-从句有以下四种不同的搭配关系:
a. It + be +形容词+ that-从句
It is necessary that… 有必要……
It is important that… 重要的是……
It is obvious that… 很明显……
b. It + be + -ed 分词+ that-从句
It is believed that… 人们相信……
It is known to all that… 从所周知……
It has been decided that… 已决定……
c. It + be +名词+ that-从句
It is common knowledge that… ……是常识
It is a surprise that… 令人惊奇的是……
It is a fact that… 事实是……
d. It +不及物动词+ that-分句
It appears that… 似乎……
It happens that… 碰巧……
It occurred to me that… 我突然想起……
形容词性从句(即定语从句)
限制性定语从句
修饰先行词,对先行词起修饰作用,紧接先行词之后,无逗号,若省去,原句意思不完整。引导定语从句的关系代词有who, whom, whose, which, that等。who, whom, whose用于指人,whose有时也可指物,相当于of which;which用于指物;that既可指人也可指物,但只用于限制性定语从句中。关系代词除了引导定语从句,替代先行词外,还在从句中担任主语、宾语、定语等。
The computers and cables which make up the Internet are owned by people and organizations.
Those who live alone or who are sick may have trouble in getting close to other people.
1)当先行词是all, anything, everything, something, nothing等不定代词或先行词前有first, last, any, few, much, some, no, only以及形容词最高级修饰时,只能用关系代词that引导从句。
2)关系代词的省略
在从句中作宾语的关系代词常可省略。关系代词紧跟介词,作介词宾语时不可用that,只可用which或whom引导从句,并且不可省略,但当介词位于宾语从句句末时,作为介词宾语的关系代词仍可用that,也可省略。
This is one of those things with which we have to put up.
This is one of those things (which\that) we have to put up with.
3)引导定语从句的关系副词有when,where,why等。关系副词在从句中作状语,意义上相当于一个“介词+which”的结构。
Even in comic books where(=in which) there are no words,the stories are fully expressed through the drawings.
No one knows the reason why(=for which) he was so angry that day.
非限制性定语从句
既可修饰先行词,也可修饰整个主句,起补充说明作用,与主句之间有逗号隔开,若省去,原句意思不受影响。不可用that引导非限制性定语从句。关系词不可省略。
Every object has a gravitational pull,which is rather like magnetism.
*“介词+which\whom\whose”引导的定语从句
“介词+which\whom\whose”可引导限制性定语从句,也可引导非限制性定语从句,该结构中介词的选择取决于从句谓语动词的固定搭配,或先行词的习惯搭配。
This is the computer on which he spent all his savings
It is written by a person with whom we are all familiar.
as引导的定语从句
as引导的定语从句主要用于“such...as”及“the same...as”的结构中,代替先行词是人或物的名词。
as引导非限制性定语从句时,代替整个主句,从句可位于主句之前、之后或中间。
These are not such problems as can be easily solved.(as代替先行词problems)
As is mentioned above,no single company or group can control what happens on the Internet.(as代替主语)
副词性从句(即状语从句)
时间状语从句:引导时间状语从句的从属连词和词组有
1)when, whenever, while, as, after, before, since, till, until, once等。
We have learnt quite a lot about it since we came here.
2)as soon as, hardly(scarcely)...when, no sooner...than, each(every) time, the moment, immediately(that)等。
As soon as I sent an e-mail message, I received positive responses.
地点状语从句:引导地点状语从句的连词是where, wherever.
Wherever she went, she took her little daughter with her.
Where I live there are plenty of trees. 我住的地方树很多。
Wherever I am I will be thinking of you. 不管我在哪里我都会想到你。
原因状语从句:引导原因状语从句的从属连词有
because, as, since, now(that),seeing that, considering that, in that等。
Considering that he is a freshman, we must say he is doing well.
比较:because, since, as和for
1)because语势最强,用来说明人所不知的原因,回答why提出的问题。当原因是显而易见的或已为人们所知,就用as或 since。
I didn't go, because I was afraid.
Since /As the weather is so bad, we have to delay our journey.
2)由because引导的从句如果放在句末,且前面有逗号,则可以用for来代替。但如果不是说明直接原因,而是多种情况加以推断,就只能用for。
He is absent today, because / for he is ill.
He must be ill, for he is absent today.
结果状语从句:引导结果状语从句的连词有so...that, such...that, so that, that, so等。
Mickey Mouse is so attractive that the children are reluctant to leave.
比较: so和 such
such 是形容词,修饰名词或名词词组,so 是副词,只能修饰形容词或副词。 so 还可与表示数量的形容词many, few, much, little连用,形成固定搭配。
so foolish such a fool
so many people such a lot of people
( so many 已成固定搭配,a lot of 虽相当于 many,但 a lot of 为名词性的,只能用such搭配。)
so…that与 such…that之间的转换既为 so与such之间的转换。
目的状语从句
引导目的状语从句的连词有:so that, in order that, for fear that, lest等,从句常使用may, might, can, could, would等情态动词。
We got up early this morning so that we could catch the first bus to the railway station.
例如:
You must speak louder so that /in order that you can be heard by all.
He wrote the name down for fear that(lest) he should forget it.
Better take more clothes in case the weather is cold.
条件状语从句
引导条件状语从句的连词和词组有if,unless,as(so) long as,on condition that,in case,provided(providing) that,supposing等。
As long as you have the right equipment,you can use a telephone line to transmit computer data.
if 引导的条件句有真实条件句和非真实条件句两种。非真实条件句已在虚拟语气中阐述。
unless = if not.
Let's go out for a walk unless you are too tired.
If you are not too tied, let's go out for a walk.
让步状语从句
连词和词组有though, although, whether, even though, even if, no matter what(when, how...),whatever(whenever, wherever, however....)等。though, even if等引导状语从句可转换成含有as的部分倒装结构,具有强调意义。其结构为“形容词(副词、动词、名词)+as+主语+谓语”。
No matter what you may say,I would not change my mind.
Young as he is,he is quite experienced in this work.(=though he is young)
Child as he is,he can speak English fluently.(=though he is a child)
1)though, although
当有though, although时,后面的从句不能有but,但是 though 和yet可连用
Though the sore be healed, yet a scar may remain.
伤口虽愈合,但伤疤留下了。
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) even 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.
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.
(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。
错题:
__now that___ we have finished the course, we shall start doing more revision work.
My favorite room is the tidy study with a fireplace, _where____ we can watch TV and enjoy the nice scenery outside. |
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