从句知识点第1篇连接词主要有if,unless,as/solongas,onconditionthat等。.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下面是小编为大家整理的从句知识点汇编24篇,供大家参考。
从句知识点 第1篇
连接词主要有 if, unless, as/so long as, on condition that 等。.
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
Let"s go out for a walk unless you are too
If you are not too tied, let"s go out for a
典型例题
You will be late ___ you leave
unless until or
答案A。
句意：除非你立即走，否则你就回迟到的。可转化为 If you dong leave immediately, you will be 、D句意不对，or表转折，句子如为 You leave immediately or you will be
从句知识点 第2篇
1、.先行词为 all , much, everything, nothing , something ,anything, nothing, none, the one等不定代词时
2、先行词被only, any, few, little, no , all, just , very ,right等修饰时.
3、 当先行词是最高级或被形容词最高级修饰时。
4、 当先行词是序数词或被序数词修饰时。
5、当先行词是数词时.
6、 当先行词既指人又指物时。
7、如有两个定语从句，其中一个关系代词已用which，另一个关系代词则宜用 that。
8、主句是There be结构,修饰其主语的定语从句宜用that 作关系代词。
9、被修饰成分为表语,或者关系代词本身是定语从句的表语时，该关系代词宜用that。
10、先行词为what，关系代词用that。
11、有时为了避免重复而使用that引导定语从句。
从句知识点 第3篇
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
虽然在下雨，但他们仍在地里干活。
He is very old, but he still works very
虽然他很老，但仍然努力地工作。
Though the sore be healed, yet a scar may
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
However Although 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
= Though he was a small child, he knew what was the right thing to
注意：
句首名词不能带任何冠词。
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
= 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 即使
We"ll make a trip even though the weather is
4) whether…or- 不管……都
Whether you believe it or not, it is
5)"no matter +疑问词" 或"疑问词+后缀ever"
No matter what happened, he would not
Whatever happened, he would not
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
(对)Whatever you say is of no use
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 囚犯们只能给什么吃什么。
从句知识点 第4篇
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
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
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
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
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
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
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
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
他清了清嗓子，像要说什么似的。
The waves dashed on the rocks as if in
波涛冲击着岩石，好像很愤怒。
从句知识点 第5篇
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?
他就是想见你的人吗?(who/that在从句中作主语)
He is the man whom/ that I saw
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 那人车坏了，大家都跑过去帮忙。
Please pass me the book whose (of which) cover is 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 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 你拿的包快散了。(which / that在句中作宾语)
从句知识点 第6篇
引言 introduction
正文 body
结束语 conclusion
引言 introduction
When you are waiting in front of a theatre or at the train terminals, you will realize how important punctuality Punctuality is really a virtue, especially in a busy city like Perhaps if everybody were punctual, there would be less suffering and
正文 body
Punctuality is the main constituent of good A person, who is always in time for his appointment, shows real consideration for On the other hand, a person who is always late shows his selfishness and thoughtlessness and he is not worthy to be friend
constituent 构成
selfishness 自私
Some people often say that they cannot always be punctual since traffic is so heavy these I think traffic congestion cannot be an excuse for being As everybody knows that we might meet an unexpected congestion on the roads, we should leave a bit earlier for the appointment to ensure that we would not be
traffic congestion 交通堵塞
Some people always have a lot of excuses for coming When they finally arrive, they keep on saying sorry to their friends and then The excuse is not always traffic congestion, sometimes they complain that they have met a friend on the road or have helped a blind man to cross the Some also like to blame their watches, the clocks at home or in the To such people, we cannot help but say sorry that we have come too
keep on doing 一直做某事
Yet after all such smart fellows will soon find that gradually their friends become fewer and Perhaps at that time, they would realize how important punctuality
结束语 conclusion
To be or not to be punctual is a So when we are young, we should try to be punctual every time and never be late for it is much more easily acquired in youth than when we are
The person I shall never forget
The person I shall never forget is She is the best friend in my
She often listens to me when my mood is Moreover, she usually gives me some advices if I need Sometimes, she lends money to me if I want to buy some new
I will never forget her help even though I already left Wuhan I think that she will be one of the most important person during my I hope that the friendship of us will keep
修改后
I will never forget her help even though I have already left Wuhan I think that she will be one of the most important persons in my I hope that the friendship of us will keep
修改后
She often listens to me when I"m in a bad Moreover, she usually gives me some advices if I need Sometimes, she lends money to me if I want to buy some new
Why We Learn English
English is an international language Everyone needs to know
When we will visit a great number of different places in the word, we need to talk about local person with We are interesting in books, otherwise nowadays many of the valuable books are written in English or translated into We in order to go through ones, so we should have a good command of
We should try our best to learn the English language
修改后
When we visit a great number of different places in the world, we need to talk about a local person in Nowadays many of the valuable books are written in English or translated into English, so if we are interested in books, we should have a good command of
修改后
We should try our best to learn English
专升本英语作文考试中，语法一定要简明扼要，而且要正确。
从句知识点 第7篇
引导词：so, so that, in order that, that, to the end that(以便，为了)，in case,for fear that,lest(以免，以防)，
目的状语从句中通常有情态动词can,could,may,might,should,would等。
注意：1、in case 还可表示“万一，假如”。
2、目的状语从句可以用so as to, in order to 等不定式代替，但主句和从句的主语必须一致。
从句知识点 第8篇
1、介词如何确定
(1)依据定语从句中动词的习惯搭配来确定
(2)依据先行词的习惯搭配来确定
(3)根据意思来确定
(4)为了强调某一名词，不定式前加上关系词
2、关系代词作介词的宾语时，介词的位置
(1)whom和which可以和介词一起放在先行词和从句之间，也可以把介词放在从句中有关动词的后面。
(2)含有介词的短语动词一般不拆开，介词仍放在动词的后面。
(3)关系代词that在从句中作介词宾语时，介词不能放在它的前面，只能放在从句中有关动词的后面。
(4)关系代词whose也可以在从句中与它所修饰的名词一起作介词宾语。
3、“名词/数词/代词+介词+关系代词”结构常见的形式有：名词/one/two/some/none/all/both/several/many/most/a few/a little/the+比较级/the+最高级…+of+which/whom。
从句知识点 第9篇
引导名词性从句的连接词可分为三类：
连接词：that,whether,if 不充当从句的任何成分)
连接代词：what, whatever, who, whoever, whom,
whose,
连接副词：when, where, how, why
不可省略的连词：
介词后的连词
引导主语从句和同位语从句的连词不可省略。
That she was chosen made us very
We heard the news that our team had
比较：whether与if 均为"是否"的意思。
但在下列情况下，whether 不能被if 取代：
whether引导主语从句并在句首
引导表语从句
whether从句作介词宾语
从句后有"or not"
Whether he will come is not
大部分连接词引导的主语从句都可以置于句末，用 it充当形式主语。
It is not important who will
It is still unknown which team will win the
从句知识点 第10篇
1)由从属连词that引导的从句叫做名词性that-从句。
That只起连接主句和从句的作用，在从句中不担任任何成分，本身也没有词义。名词性that-从句在句中能充当主 语、宾语、表语、同位语和形容词宾语，例如：
主语：That he is still alive is sheer 他还活着全靠运气。
宾语：John said that he was leaving for London on 约翰说他星期三要到伦敦去。
表语：The fact is that he has not been seen 事实是近来谁也没有见过他。
同位语：The fact that he has not been seen recently disturbs everyone in his
近来谁也没有见过他，这一事实令办公室所有的人不安。
形容词宾语：I am glad that you are satisfied with your
你对工作满意我感到很高兴。
2)That-从句作主语通常用it作先行词，而将that-从句置于句末，例如：
It is quite clear that the whole project is doomed to 很清楚，整个计划注定要失败。
It"s a pity that you should have to 你非走不可真是件憾事。
用it作形式主语的that-从句有以下四种不同的搭配关系：
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……
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……
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……
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……
从句知识点 第11篇
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 任何人都有不得不屈服的时候。
Beijing is the place where (in which) I was 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 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 他不大可能找到他四十年前居住过的地方。
从句知识点 第12篇
1、在表语从句和同位语从句中只能用whether不能用if;当主语从句放于句首时，只能用whether不用if;当it作形式主语，主语从句放在句末时用whether或if均可;discuss后引导宾语从句时，必须用whether。
2、在宾语从句中：
(1)及物动词后：whether从句中不能有否定式，宾语从句为否定句时用if;if不能与or not连用，但可以用whether or not;whether后可以加不定式。
(2)介词后：只能用whether,不用if。
从句知识点 第13篇
引导词：(如此。。。以至于。。。)，(如此。。。以至于。。。)，so that(结果是)，with the result that(所以，结果是)
注意：(1)与的区别
So+形容词such+a/an+形容词+单数名词
So+形容词+a/an+单数名词such+形容词+复数名词
So+副词such+形容词+不可数名词
So many/few+复数名词
So much/little+不可数名词
(2)so that引导的目的状语从句与so that 引导的结果状语从句
目的状语从句一般使用情态动词，结果状语从句一般不使用情态动词;
结果状语从句常常用逗号与主句分开。
(3)与;与
为结果状语从句;为定语从句。
从句知识点 第14篇
结果状语从句常由so… that 或 such…that引导，掌握这两个句型，首先要了解so 和 such与其后的词的搭配规律。
比较：so和 such
其规律由so与such的不同词性决定。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 foolishsuch a fool
so nice a flowersuch a nice flower
so many / few flowers such nice flowers
so much / little such rapid progress
so many peoplesuch 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。
The boy is so young that he can"t go to
He is such a young boy that he can"t go to school
从句知识点 第15篇
一、 培养兴趣与自信
学习英语，要重视自己英语兴趣的培养，兴趣是最好的老师说的就是这个意思。如果能把学习变成一种兴趣，那么学习起来就相对更加轻松，也不会把学习英语当做是一种任务，而是满怀期待的去做这件事，才能够把事情做到最好。
同时还要建立自己的英语自信心，学英语不是一蹴而就的事情，即使你再感兴趣也会遇到各种难题，所以，要知道任何事情不是一帆风顺的，英语学习也是这样，要端正心态、正确认识自己的能力，保持积极的自信心。
二、 重视量的积累与质的飞跃
量的积累，就是告诉大家一定要多学习、多练习，多范围涉猎英语知识、了解更多的英语文化，就能掌握英语之间的关联性。
有了量的积累，想要把量变变成质变，就是要从多到好、好到精学习英语、积累英语知识，而不是永远重复最基本的知识。相信有了前面的积累，对英语的学习才能更好的深入。
三、 学以致用
学习英语就是拿来用的，只有把英语用到实处才能更明白英语的实际用处，把学习与生活连接起来。只有把理论与实践相结合才能把知识深深的装进脑海里，像母语学习一样，脱口而出。
从句知识点 第16篇
1)不用that的情况
a) 在引导非限定性定语从句时。
(错)The tree, that is four hundred years old, is very famous
b) 介词后不能用。
We depend on the land from which we get our
We depend on the land that/which we get our food
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。
举例：
All that is needed is a supply of
所需的只是供油问题。
Finally, the thief handed everything that he had stolen to the
那贼最终把偷的全部东西交给了警察。
从句知识点 第17篇
1)yes-no型疑问从句
从属连词if, whether引导的名词从句是由一般疑问句或选择疑问转化而来的，因此也分别被称为yes-no型疑问句从句和选择型疑问从句，其功能和wh-从句的功能相同， 例如：
主语：Whether the plan is feasible remains to be 这一计划是否可行还有等证实。
宾语：Let us know whether / if you can finish the article before 请让我们知道你是否能在星期五以前把文章写完。
表语：The point is whether we should lend him the 问题在于我们是否应该借钱给他。
同位语：They are investigating the question whether the man is 他们调查他是否值得信赖。
形容词宾语：
She"s doubtful whether we shall be able to 她怀疑我们是否能够前来。
介词宾语：
I worry about whether he can pass through the crisis of his 我担心他是否能度过疾病的危险期。
2)选择性疑问从句
选择性疑问从句由关联词if/whether…or或whethe…or not构成，例如：
Please tell me whether / if they are Swedish or 请告诉我他们是瑞典人还是丹麦人。
I don"t care whether you like the plan or 我不在乎你是否喜欢该计划。
从句知识点 第18篇
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
I"ll never forget the days when I worked together with
判断改错(注：先显示题，再显示答案，横线;用不同的颜色表示出。)
(错) This is the mountain village where I visited last
(错) I will never forget the days when I spent in the
(对) This is the mountain village (which) I visited last
(对) I"ll never forget the days (which) I spent in the
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。此两题错在关系词的误用上。
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。
例 Is this museum ___ you visited a few days age?
that on which the one
例 Is this the museum ____ the exhibition was
that on the one
答案：例1 D，例2 A
例1变为肯定句：
This museum is ___ you visited a few days
例2变为肯定句：
This is the museum ___ the exhibition was
在句1中，所缺部分为宾语，而where, that, on which都不能起到宾语的作用，只有the one既做了主句的表语，又可做从句的宾语，可以省略关系代词，所以应选D。
而句2中, 主、谓、宾俱全，从句部分为句子的状语表地点，既可用副词where，又因 in the museum词组，可用介词in + which 引导地点状语。而此题中，介词on 用的不对，所以选A。
关系词的选择依据在从句中所做的成分，先行词在从句中做主、定、宾语时，选择关系代词 (who, whom, that, which, whose); 先行词在从句中做状语时，应选择关系副词 ( where 地点状语，when 时间状语，why 原因状语) 。
从句知识点 第19篇
1) 将think, believe, suppose, expect, fancy, imagine等动词后面宾语从句的否定词转移到主句中，即主句的谓语动词用否定式，而从句的谓语动词用肯定式。
I don"t think I know 我想我并不认识你。
I don" t believe he will 我相信他不回来。
注意：若谓语动词为hope,宾语从句中的否定词不能转移。
I hope you weren"t 我想你没有生病吧。
2) 将seem, appear 等后的从句的否定转移到前面。
It doesn"t seem that they know where to
看来他们不知道往哪去。
It doesn"t appear that we"ll have a sunny day
看来我们明天不会碰上好天气。
3) 有时将动名词，介词短语或整个从句的否定转变为对谓语动词的否定。
I don"t remember having ever seen such a
我记得从未见过这样一个人。
(not否定动名词短语 having…)
It"s not a place where anyone would expect to see strange characters on the
在这里，人们不会想到在街上会碰上陌生的人。
(anyone 作主语，从句中的谓语动词不能用否定形式。)
4) 有时状语或状语从句中否定可以转移到谓语动词前。
The ant is not gathering this for itself (否定状语)蚂蚁不只是为自己采食。
He was not ready to believe something just because Aristotle said (否定because状语) 他并不因亚里斯多德说过如何如何，就轻信此事。
She had not been married many weeks when that man"s younger brother saw her and was struck by her (否定状语many weeks)她结婚还不到几个月，这个人的弟弟就看见她了，并对她的美貌着了迷。
从句知识点 第20篇
1、主语从句
(1)that从句作主语时，常用it作形式主语，常见的句型有：
It+be+形容词(obvious, true, natural, surprising,good,wonderful,funny,possible,likely,certain,probable,)+that从句
It+be+名词词组(no wonder, an honor, a good thing, a pity, no surprise, )+that从句
It+be+过去分词(said, reported, thought, expected, decided, announced, arranged, )+that从句
(2)that可以省略，但that从句位于句首时，that不能省略。
2、宾语从句
(1)常见的可以接that从句作宾语的动词有see, say, know, imagine, discover, believe, tell, show, think, consider, be sure, be afraid等。在可以接复合宾语的动词之后，如think, make, consider等，可以用it作形式宾语。
(2)That从句一般不能充当介词宾语，偶尔可作except, in 的宾语。
3、表语从句(that不可省略)
4、同位语从句
连词that引导同位语从句时，应在某些抽象名词之后，如：fact, hope, desire, thought, suggestion, idea, news, problem, possibility等，对前面的名词起补充说明的作用，that在从句中不担当任何成分，不能省略。
从句知识点 第21篇
文章开端的常见写法
背景法：说明事件发生的时间、地点、情景等背景。如：
I was once spending the month of 1982 in a small seaside village in the south of It is a wonderful place quiet and not People usually do not go
人物法：交代文章所要描述的主要人物或有关人物。如：
Once upon a time there was an honest old fellow named He had a kind heart and a funny, round, good humoured He lived in a tiny cottage all alone, and every day he worked in his
alone 独自一人
lonely 孤独的
主题句法：提出一个观点或论据作为文章要阐明和论述的主题。如：
One of the most notable phases of the industrial revolution was the rapid growth of cities --the shifting of population from rural districts to the urban
rural 乡村的unban 城市的
问题法：用提出问题的方法来引出文章的内容，以吸引读者的注意力。如：
What is the nature of the scientific attitude, the attitude of the man who studies and applies physics, chemistry, medicine, engineering or any other science?
惊语法：用令人感到惊奇的句子开头，激起读者的兴趣。如：
A 39-storeyed building in construction collapsed in the city
故事法：以讲述一段故事作为引子，在此基础上展开故事情节。如：
I was spending the night in my aunt"s villa one That night, being on a strange bed and feeling excited prevented me from I slipped out of bed and went to the Suddenly, a strange noise coming from behind made me spin
villa 别墅
prevent from doing 阻止某人做某事
spin around 使人头晕目眩
数据法：引用已经证实的某些统计数字来引起话题。如：
The fact that less than 5% of the British population graduate from universities may seem surprising, especially when compared with the American percentage of over 30%
引语法：摘录或引用某些名人的名言或常见的习语、谚语，作为文章的开端。如:
Happiness is very important to our Shakespeare said, "One who is unhappy can never get a beneficial "
be important to
定义法：常见于对标题下定义，然后通过举例，逻辑推理等方法加以详细说明。如：
A true good student is one who possesses good morality, sound health, perfect knowledge and various
morality 道德品质
sound 健康的
从句知识点 第22篇
1、主语从句：特殊疑问词引导主语从句时，常用it作形式主语。
2、宾语从句
(1)常见的能接特殊疑问词引导的宾语从句的动词有see, tell, ask, answer, know, decide, find out, imagine, suggest, doubt, wonder, show, discuss, understand, inform, advise等。
(2)作介词宾语。
3、同位语从句、表语从句
四、名词性关系从句
What=the thing(s) which/that, whoever=anyone who, whichever=anyone/anything that, whatever=anything that, where=the place where, when=the time when
从句知识点 第23篇
1、that 指人或物在从句中作主语，宾语或表语
which 指物在从句中作主语，宾语或表语(作宾语时可以省略)
who 指人在从句中作主语，宾语或表语
whom 指人在从句中作宾语
whose 指人或物在从句中作定语
as 指人或物在从句中作主语，宾语或表语
but 指人或物在从句中作主语，宾语或表语
注意：指物时，whose+名词=the+名词+of which或 of which+the+名词
2、as 的用法
(1)常用于下列结构：such…as; so…as;the same…as; as…as
注意：the same…as 表示同一类，不同一个
the same…that 表示同一个
(2)as与which的区别
a、位置不同
as可放在主句后，主句前或主句中间;which只能放在主句后。
b、as起连接作用，表达说话人的观点、看法，并指出主句内容的根据或出处，意为“正如，正像”。
Which相当于并列句，可以用and this来代替，意为“这一点，这件事’”。
注意：as常用于下列结构：as we know/ as is known to all, as we all can see, as has been said before/above,
as might be excepted, as is often the case, 一般不能用which代替as。
c、在从句中作主语时，which既可作系动词be的主语也可作实义动词的主语，而as只可作系动词be的主语。
从句知识点 第24篇
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 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 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 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 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 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 他似乎没抓住我的意思，这使我心烦。
Liquid water changes to vapor, which is called 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。
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