as引导的定语从句

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as在定语从句中的用法

as在定语从句中的用法

关系代词as 引导的定语从句1、as 可以在定语从句中做主语或宾语,代表前面整个句子。

如:He married her, as was natural.他跟她结婚了,这是很自然的事。

He is honest, as we can see.他很诚实,这一点我们看得出来。

2、as 引导的非限制性定语从句可以放在主句之前、主句之后,甚至还可以分割主句。

另外,as 常常有“正如、正像”的含义。

如:As is known to all, China is a developing country.众所周知,中国是发展中国家。

He is from the south, as we can know from his accent.他是南方人,从他的口音我们就可以知道。

John, as you know, is a famous writer.正如你所知,约翰是个著名作家。

3、当先行词受such, the same 修饰时,关系词常用as。

如:I’ve never heard such stories as he tells.我从未听过象他讲的这样的故事。

He is not such a fool as he looks.他可不象他看上去的那样傻。

This is the same dictionary as I lost last week.这部词典跟我上星期丢失的一样。

注意:当先行词受the same 修饰时,偶尔也用 that引导定语从句,但与as引导的定语从句意思有区别。

如:She wore the same dress that she wore at Mary's wedding.她穿着她在玛丽婚礼上穿过的那个同一条连衣裙。

She wore the same dress as her younger sister wore.她穿就像着跟她妹妹所穿的一样的连衣裙。

as引导的定语从句

as引导的定语从句

as引导的定语从句
1. as soon as(一…就…):引导一个时间性定语从句。

例如:I will call you as soon as I finish my work.(我一做完工作就给你打电话。

)2. as long as(只要):引导一个条件性定语从句。

例如:You can borrow my car as long as you promise to drive carefully.(只要你答应小心驾驶,你可以借用我的车。


3. as far as(就…而言,就…而论):引导一个程度或范围的定语从句。

例如:As far as I know, he is still living in New York.(就我所知,他仍然住在纽约。


4. as well as(和…一样;不仅…而且):引导一个并列关系的定语从句。

例如:He speaks French as well as English.(他不仅会说英语,还会说法语。


5. as if / as though(好像;仿佛):引导一个比拟关系的定语从句。

例如:She looks as if she hasn't slept for days.(她看上去好像已经好几天没有睡觉了。

)。

as 在定语从句中的用法

as 在定语从句中的用法

as 在定语从句中的用法在定语从句中,"as" 可以作为关系代词或关系副词使用。

1. "as" 作为关系代词:当"as" 作为关系代词时,它引导一个非限制性定语从句,用来修饰前面的名词,并且在从句中起到主语的作用。

例如:- He works as an engineer, as his father did. (他做工程师,就像他父亲一样。

)在这个例子中,"as" 引导的定语从句修饰名词"engineer",并且在从句中作为主语。

进一步解释这个例子,可以将定语从句分解为两个简单句子:- He works as an engineer.- His father did (work as an engineer).2. "as" 作为关系副词:当"as" 作为关系副词时,它引导一个限制性定语从句,用来修饰前面的名词,并且在从句中起到比较程度、原因、方式、时间等方面的作用。

比较程度:- She is not as tall as her sister. (她不如她姐姐高。

)在这个例子中,"as" 引导的定语从句修饰名词"tall",表示比较程度。

原因:- I couldn't sleep last night, as I drank too much coffee. (我昨晚睡不着觉,因为我喝了太多咖啡。

)在这个例子中,"as" 引导的定语从句修饰名词"I",表示原因。

方式:- The teacher explained the math problem as clearly as possible.(老师尽可能清楚地解释了这道数学题。

)在这个例子中,"as" 引导的定语从句修饰名词"clearly",表示方式。

as引导的定语从句辨析

as引导的定语从句辨析

as引导的定语从句辨析定语从句一直是学生在学习英语时的重点和难点,而学生对as引导的定语从句与其他相似的从句更容易混淆,现就它们作一简单的归纳与辨析。

一、as引导限制性定语从句关系代词as 可以引导限制性定语从句,在从句中可作主语、宾语或表语,但as只用在“the same…as…”“such … as…”“ so…as…”和“as…as…”结构中。

例如:I’d like to use the same recorder as is used in class. (as 在从句中作主语)He is such a man as is always ready to help others.(as在从句中作主语)I am not so strong a man as I was.(as 在从句中作表语)She will marry as rich a man as she can find.(as 在从句中作宾语)辨析1. 当先行词被the same 修饰时用as 与that引导定语从句的比较as引导的定语从句表示“相似”意义,即主句与从句所讲的是同类的人或事物,而that引导的定语从句表示“同一”意义,即主句与从句所讲的是同一个人或事物。

例如:She wore the same (= the same kind of)dress as her younger sister wore. (她穿着跟她妹妹所穿的一样的连衣裙。

)She wore the same (= the very )dress that she wore at Mary’s wedding. (她穿着她在玛丽婚礼上穿过的同一条连衣裙。

)辨析2. “such / so… as …” 与“such / so…that …” 结构的比较在“such / so… as …” 结构中,as 引导定语从句并在从句中作主语、宾语或表语,而在“such / so…that …”结构中,that 引导结果状语从句并在从句中不作任何成分。

(完整版)As引导从句归纳总结

(完整版)As引导从句归纳总结

As引导从句归纳总结一、as引导定语从句一)as引导限制性定语从句主要结构有:the same…asas…assuch…asso…as主句中出现the same, as, such, so修饰先行词,需选择as做关系代词在定语从句中做主语或宾语。

1. It’s the same person as we wanted to find yesterday .我们昨天要找的是同一个人。

2. Such girls as he knows are good at English .他所认识的女孩都擅长英语。

3. Do you have such books as we like ?你有我们喜欢那种书吗?4. She will marry as healthy a man as she can find .她将嫁给她能找到的任何一个有钱人。

5. There is so warm a house as we want to live in .这里有如此暖和的房子,我们都想住在里面。

6. He has so difficult a problem , as none of us can solve .他有如此难的一个问题,我们没有人能解决。

二)引导非限制性定语从句1. as引导非限制性定语从句,指代整个主句内容,从句可置于句首,句中或句尾1) As everyone knows ,China is a beautiful country with a long history .每个人都知道,中国是一个有着悠久历史的美丽国家。

2) The earth , as we know , moves round the sun .地球,我们都知道,围着太阳转。

3) Tom works hard and is willing to help others, as we all know.汤母工作努力,并且乐于助人,这一点我们都知道。

as引导的定语从句和比较状语从句

as引导的定语从句和比较状语从句

as引导的定语从句和比较状语从句定语从句是指修饰名词或代词的从句,它可以用来限定名词的范围,进一步说明名词的特征或属性。

定语从句通常由关系代词或关系副词引导,并且as也可以用来引导定语从句。

比较状语从句是用来表示两者之间的比较关系的从句,它可以通过对比不同之处或相似之处来进一步阐述事物的特点。

比较状语从句通常由as引导,用来表达程度上的相似或对比。

一、as引导的定语从句1.as引导的定语从句可以修饰名词或代词,用来进一步说明名词的特征。

-He is not as smart as his sister.(他不如他姐姐聪明。

)-The book,as we all know,is a classic.(正如我们所知道的那样,这本书是一部经典之作。

)2.as引导的定语从句可以用来表示原因或方式。

-She left the meeting early,as she had a headache.(因为头疼,她提前离开了会议。

)-Tom swims as if he were a fish.(汤姆游泳的样子就像是一条鱼一样。

)二、as引导的比较状语从句1.as引导的比较状语从句用来表示程度上的相似。

-She speaks English as fluently as a native speaker.(她英语说得像母语者一样流利。

)-The athlete runs as fast as a cheetah.(这位运动员跑得像一只猎豹一样快。

)2.as引导的比较状语从句用来表示对比。

-The weather in Beijing is not as hot as that in Guangzhou.(北京的天气没有广州那么热。

)-He doesn't earn as much money as his brother.(他赚的钱没有他哥哥多。

)as引导的定语从句主要用来修饰名词或代词,并进一步说明其特征或属性;as引导的比较状语从句则用来表示程度上的相似或对比。

定语从句as的三种用法

定语从句as的三种用法

定语从句as的三种用法定语从句 "as" 有以下三种用法:1. 引导限制性定语从句:这种用法中,as在从句中作主语、宾语或表语。

例如:The car, as you know, cost me a lot of money. (你知道,那辆车花了我很多钱。

)I'll take the book, as you suggested. (按照你的建议,我会拿那本书。

)The child, as is well known, needs love and care. (众所周知,那个孩子需要爱和照顾。

)2. 引导非限制性定语从句:这种用法中,as在从句中作主语、宾语或表语。

例如:My sister, as you know, is a doctor. (你知道,我姐姐是一名医生。

)The book, as I have said, is very interesting. (正如我所说的,这本书非常有趣。

)The film, as you can imagine, was very emotional. (正如你可以想象的,这部电影非常感人。

)3. 引导方式状语从句:这种用法中,as在从句中作方式状语,表示“正如”、“就像”的意思。

例如:He did it, as we had expected. (他按照我们预期的那样做了那件事。

)She spoke to the camera, as if she was addressing a crowd of people. (她对着镜头讲话,就像是在向一群人发表演讲一样。

)。

定语从句中用as的四种情况

定语从句中用as的四种情况

定语从句中用as的四种情况1、当as引导表示方式的定语从句时:例如:He spoke in a low voice, as if he was too timid to make himself heard. 他说话语气低沉,好像害怕自己的声音太小无法被听见一样。

2、当as引导表示程度的定语从句时:例如:The mountain was as high as a castle. 这座山就像一座城堡一样的高。

3、当as引导表示身份的定语从句时:例如:We invited her to the party as our teacher. 我们邀请她以老师的身份参加派对。

4、当as引导表示比喻的定语从句时:例如:The dream dissolved as quickly as smoke. 梦境瞬间消散就像烟一样。

as作为连词在定语从句中最常见的四种用法就是上述所列,那么我们来简单说一下这四种情况下as的用法。

首先,当as引导表示方式的定语从句时,它和like意思相近,表示“仿佛”的意思,此时,as后一般接着一个由介词短语、形容词、动词等构成的状语从句;其次,当as引导表示程度的定语从句时,表示“一样”的意思,此时,as后一般接着一个定义词性短语,比如形容词、名词、副词、介词短语等,来表示“等于”的意思;然后,当as引导表示身份的定语从句时,它表示“作为”的意思,它后面接一个由介词短语、限定词性短语等构成的状语从句;最后,当as引导表示比喻的定语从句时,它表示“像”的意思,它后面一般接一个相对定的比较概念,以表示“就像”的意思。

以上就是as在定语从句中所涉及的四种情况,大家可以通过记住它们的具体结构,以及后面的接法来不断积累,从而掌握它们的用法。

只要结合例句,多加练习,一定可以掌握它们并能运用得熟练。

(完整版)as引导定语从句

(完整版)as引导定语从句
as might be expected as we had expected正如所料 as is well known to all众所周知
as anybody can see
⑵ as引导非限制性定语从句,“正如, 正像”的含义
The boy has as much progress ,as we had expected. 正像我们所预料的那样,这个男孩取得 了大的进步。
(3)
1 as在非限制性定语从句中做宾语时通常 做see 、watch 、know 、say 、tell 、 remember 等词的宾语
as 引导定语从句
一、as引导限制性定语从句
先行词前通常有such、the same、as、so, 构成such as、the same...as、as…as so...as结构, 作主语,宾语和表语
Don’t trust such men as praise you to your face. 不要相信那种当面吹捧你的人。
2. Such girls as he knows are good at English . 他所认识的女孩都擅长英语。
3. Do you have such books as we like ? 你有我们喜欢那种书吗?
4. She will marry as wealthy a man as she can find . 她将嫁给她能找到的任何一个有钱人。
It was true,as everybody could know.
As has been said before, China plays an important role in the world.
2 as在非限制性定语从句中做主语时, 谓语动词通常是被动形式,如是不及 物动词,则正常使用。

as引导的定语从句例句

as引导的定语从句例句

as引导的定语从句例句as引导的定语从句例句你对英语语法感兴趣吗?英语语法是针对英语语言进行研究后,系统地总结归纳出来的一系列语言规则。

例如:as引导非限制性定语从句,一般不指...总之,由于as的用法复杂,分享了as引导的定语从句的例句,欢迎阅读!一、as用作关系代词引导定语从句1. as 引导非限制性定语从句,一般不指代某个具体的名词或代词,而是代表整个主句或主句的一部分。

这种从句可放在主句之前,也可以放在主句之后,有时还可以放在主句的中间。

如:As is reported in the newspapers, talks between the two countries are making progress. 正如在报纸上所报道的,两国间的谈判有所进展。

Grammar is not a set of dead rules, as has been said above. 如上所说,语法不是一套死条文。

Spiders are not insects, as many people think, nor even nearly related to them. 蜘蛛不是昆虫,尽管许多人都这样认为,它甚至与昆虫几乎没有联系。

2. as 引导限制性定语从句,主要用于the same…as(与……相同),such…as(像……一样),as…as(与……一样)。

如:She knew he felt just the same as she did. 她知道他的感受和她一样。

Such a man with a good temper as Mr. Li is is easy to get along with. 像李先生这样好脾气的人是容易相处的。

He smokes as expensive a cigarette as he can afford. 他抽一种他买得起的最贵的烟。

二、as作为从属连词引导时间状语从句表示“当……的时候”或“一边……一边”,强调主句的动作和从句的.动作同时发生。

as在定语从句的用法

as在定语从句的用法

as在定语从句的用法as 在定语从句的用法英语是一种西日耳曼语支,最早被中世纪的英国使用,并因其广阔的殖民地而成为世界使用面积最广的语言。

下面是店铺为大家整理的as 在定语从句的用法,欢迎阅读与收藏。

as 在定语从句的用法1一、as引导定语从句与其它词连用A.用于the same...as...结构中This is the same sickle as I lost yesterday.这把镰刀和我昨天丢的那把一样。

We drove out of the town by the same road as we had entered by.我们沿着进城的同一道路开车出城。

This is the same material as is used in building the bridge.这和建那座桥所用的材料一样。

注意:在这一结构中,as有时可以由that代替。

例如:I live in the same district as /that he lives in.我和他住在同一区。

但两者亦有区别:1.当定语从句省略谓语部分时,要用as。

例如:She uses the same scent as you(do)/that you do.她用的香水和你的一样。

This book of his is the same as yours.他的这本书和你的那本一样。

2.在容易引起歧义时,慎用as和that。

例如:This is the same knife as I lost last week.(一般理解为:这把刀和我上周丢的那把相似。

也可理解为:这是我上周丢的那把刀。

)This is the same knife that I lost last week.这是我上周丢的那把刀。

3.that在现代英语中可作关系副词,而as则不可。

例如:I live in the same district that he lives.(不可用as。

英语as引导的定语从句及非限制性定语从句

英语as引导的定语从句及非限制性定语从句
This is the same bike that we lost yesterday.
.All the people should meet at the same hall___won the prize. Who .I’m looking for such a place ___I found my lost sister. Where .He is so good a teacher ___we all respect. As .He is so good a teacher __we all respect him. that
1.He is one of the students who __h_a_v__e____(have) seen the film.
2. He is the only of the students who h__a_s____(have) passed the exam.
3. He is not the only one of the students who_h__a_v_e__( have ) read the book.
关系词做宾语时可省 关系词做宾语时不可省
限定先行词
对现行词起补充说明作用
The man , who has three children, is my uncle.
那个人, 有三个孩子, 是我的叔叔。
The man who has three children is my uncle.
那有三个孩子的人是我的叔叔。
She entered a good university, __a_s__ we had expected.
限制性定语从句 非限制性定语从句
先行词与从句间没 有逗号隔开

as引导定语从句

as引导定语从句

二、as引导 非限定性定语从句 译“正如”,习惯用语
①as we know=as is known 众所周知
②as we expect= as is expected 正如所期望的
③as is often the case 通常情况是这样
④as often happens 正如经常发生的那样
⑤as is mentioned above 正如上面提到的
一、as引导 定语从句句型
1. the same +n.+ as(同类人或物) that(同人同物)
+定语从句 as 在定语从句作主语、宾语、 表语不能省略 that 在定语从句作宾语,可省。
eg1. I want to buy the same pen __a_s__ you are using. eg2. This is the same bicycle __th_a_t___ I have lost.
ห้องสมุดไป่ตู้
eg. Being exposed to diverse
cultures is really a great experience, _w_h_i_c_hdefinitely
extends/ broadens our minds
/horizons and even benefits our
future development a lot. (注:benefit sb/sth 使……受益 匪浅)
4. This is _A___ stone _____ no one can lift it. 5. This is _C___ stone _____ no one can lift. A. so heavy a, that B. so heavy, as C. such a heavy, as D. such heavy a ,that

as 的定语从句

as 的定语从句

as 的定语从句
“as”在英语中可以引导定语从句,这种定语从句称为“as”定语从句。

通常,“as”在定语从句中用作关系代词,代替先行词,在定语从句中充当成分。

“as”引导的定语从句通常置于句首,并且有以下几种用法:
1.限制性定语从句:这种用法中,“as”用于限制先行词,以表明它具有特
定的属性或特征。

例如:
2.As an excellent swimmer,he was the first to reach the sinking boat.
3.(作为一名优秀的游泳运动员,他是第一个到达正在下沉的船只的人。


4.在这个例子中,“as”引导的定语从句修饰了“he”,表明他是一个优秀
的游泳运动员,因此能够第一个到达正在下沉的船只。

5.非限制性定语从句:这种用法中,“as”引导的定语从句并不限制先行词,
而是对先行词进行补充说明或提供额外信息。

例如:
6.He has published several books,as is well known.
7.(众所周知,他已经出版了几本书。


8.在这个例子中,“as”引导的定语从句提供了额外的信息,即“众所周
知”,来补充说明前面的主句内容。

需要注意的是,“as”引导的定语从句有时也可以置于句中或句末,但这种用法相对较少见。

1。

as引导的定语从句的用法

as引导的定语从句的用法

as定语从句的用法一:as可以代替整个句子或一件事,引导非限制性定语从句,在从句中作主语、宾语或表语,意为“正如……,就像……,据……”;从句位置可置于主句之前或之后,有时也可作为插入语置于句中,一般用逗号和主句隔开。

as的这种用法常见于以下这些结构:as we can see, as can be seen, as we know, as is(well)known, as may be imagined, as often happens, as has been said before, as was mentioned above, as is often the case, as/indeed it is…例:As is well known,great changes have taken place in China. 或Great changes, as is well known, have taken place in China.众所周知,中国发生了巨大的变化。

( as在定语从句中作主语。

)This experiment is very simple,as indeed it is.实验非常简单,事实上也确实如此。

(as在定语从句中作表语。

)注意:①which在引导非限制性定语从句时,也有和as一样的功能,可以代替整个句子,但which只能用在主句之后。

②在as所引导的非限制性定语从句中,如果运用的是被动语态结构,be动词可以省略;但which没有此用法,be动词不可省。

例如:She married him,which was unexpected.=She married him as(was)unexpected.她嫁给了她,这一点大家都没有料到。

(作主语,代替前面的句子;用which时was不可省。

)二as除了代替整个句子,也可以代替主句中一个特定的词。

as在它引导的定语从句(限制性或非限制性)中可以充当主语,宾语和表语;在这种用法中它经常和such, so, the same等词搭配使用;且当先行词中有such, so, the same等词修饰时,关系代词通常必须用as。

as引导的定语从句

as引导的定语从句

as引导的定语从句
1、as用作关系代词和关系副词引导限制性定语从句,并在从句中作主语、宾语、状语或表语,构成the same。

2、as多与such 或the same连用,可以代替先行词是人或物的名词。

3、as 也可单独使用,引导非限制性定语从句,作用相当于which。

扩展资料
4、as引导的非限制性定语从句位置较灵活,可以位于主句前面。

中间或后面,一般用逗号与主句隔开,但which所引导的非限制性定语从句只能放在主句之后。

as:释义:像,如同。

语法:as用作副词时主要用来表示比较,意思是“像…一样,如同”。

可以单独使用,但更多的是用在as...as结构中,其中第一个as 是副词,其后可接形容词或副词,也可接其他成分,as前可有状语。

例句:
(1) As is known to all, China is a developing country.
(2) He is from the south, as we can see from his accent.
(3) John, as you know, is a famous writer.
(4) He has been to Paris more than several times, which I don’t believe.。

as定语从句例句

as定语从句例句

as定语从句例句 :关系代词as引导定语从句时,既可以单独使⽤,也可以与其它词连⽤,分享了as定语从句的例句,⼀起来看看吧! as单词有三种使⽤⽅法: ①.连词conj. 因为;随着;虽然;依照;当…时; ②.介词prep. 如同;当作;以…的⾝份; ③.副词adv. 同样地;和…⼀样的。

as引导各类从句进⾏汇总,并具体总结出其特性,及例句: ⼀、as引导原因状语从句 as表⽰“因为”,与because相⽐,较⼝语化,所表达的原因语⽓较弱,所表的原因⽐较明显,或是已知的事实。

例1:As the weather is so bad, we have to delay our journey. 因为天⽓太糟糕,我们不得不推迟旅⾏。

例2:Any new source of energy will be very welcome, as there is already a shortage of petroleum. 任何新型能源都将⼤受欢迎,因为⽯油已经出现短缺。

⼆、as引导⽅式状语从句 as表⽰“按照”,“以……⽅式”,“像……⼀样”,“正如”。

例:Do as the Romans do when in Rome. ⼊乡随俗 注:as在引导⽅式状语从句时,还常出现在⼀个固定的类⽐结构中:(just) as …, so…。

这⼀句型表⽰类⽐,基本含义是“正如……,所以……”。

例:Just as virtue is its own reward, so is vice its own punishment. 善有善报,恶有恶报。

三、as引导让步状语从句 as可以表⽰“尽管”,“虽然”,引导让步状语从句,但必须构成倒装。

让步状语从句倒装规则有两类: 1、动词原形+as+主语+助动词(may/might, will/would, can/could, do/does/did),主句。

例:Try as we may, we cannot sense directly the television signal sent out from the broadcast station. 尽管我们费了很⼤的劲,也⽆法直接觉察发射台发出的电视信号。

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定语从句准关系代词as的用法
一.as
引导状语从句的连词as可以用作关系代词,引导定语从句,因而被称作准关系代词。

1.准关系代词as引导限制定语从句,用于以下3个结构中,as在从句中作主语、宾语或表语:
a.so / such…as
Such people as were mentioned by him were honest. (as作主语)
I’ve never seen such a clever man as he is. (as作表语)
Last term our maths teacher set so difficult an (= such a difficult) examination problem as none of us worked out.
b.the same…as
Modern statemen are often faced with the same problem as defeated the ancient Romans. (as 作宾语)
I like the same book as you do. (as 作宾语)
c.as…as
As many children as came were given some cakes. (as 作主语)
He is as diligent a man as ever lived. (as 作主语)
补充:
a.such…as 与such…that的区别
such…as 引导定语从句;such…that引导结果状语从句。

They talked in such simple English as children could understand.
他们用孩子们能听懂的简单的英语交谈。

They talked in such simple English that children could understand it.
他们用十分简单的英语交谈,连孩子们都能听懂。

I will provide you with such things as you may need.
我要供给你一些你可以用得着的东西。

He shut the window with such a force that the glass broke.
他如此用力地关门,结果玻璃碎了。

b.the same…as与the same…that的区别:
the same…as指两物相似,the same..描述的是同一物。

This is the same bag as I lost yesterday.
这个书包和我昨天丢失的(书包)相似。

(相似物)
This is the same bag that I lost yesterday.
这正是我昨天丢失的那个书包。

(同一物)
2.准关系代词as引导非限制定语从句。

a.as引导非限制性定语从句,只代表主语或主句的一部分所表达的意思(不能指代某个名词或代词),可
以放在主句前,后或中间,在从句中作主语或宾语、例如:
As is known to all, he is the best student in our class. (as指代整个句子,作主语,置于句首)
He opposed the idea, as could be expected. (as 指代整个句子,作主语,置于句末)
As we all know, he studies very hard. (as 指代整个句子,作宾语,置于句首)
Taiwan is, as you know, an inseparable part of China. (as指代整个句子,作宾语,置于句中)
常用的这类句式有:
as is said above 综上所述- as is known to all 众所周知
as is often the case 通常如此- as is reported in the newspaper 如报纸所报导的
b.主句具有否定意义,as引导的定语从句位于主句之后时,as指代得主句不包括否定意义,并可用but
取代。

例如:
Whales are now fish, as some people think / but some people think they are.
I am no orator, as Brutus is.我不善言词,而勃鲁特斯却是个雄辩家.
Spiders are notinsects,as many people think, nor even near1y related to them.
蜘蛛不是昆虫,尽管许多人认为它是昆虫,它甚至与昆虫几乎没有关系.
但as引导的定语从句谓语主句前时,as指代的主句仍包括否定意义。

As has been said above, grammar is not a set of dead rules.
正如前面所说的,语法不是一套死条纹。

3.在非限制性定语从句中,which和as引导定语从句时的区别:
a.which引导的从句不能放在主句前,而as引导的从句则既可以放在主句前,也可以放在主句后。

例如:
b.用能做关系代词,as和which都可以指代一个句子,但as有“正如”、“就像”之意,which则没有此
含义。

He is a foreigner, as I know from his accent. (as指代一个句子,意为“正如”、“就像”)
He has to work on Sunday, which he doesn’t like. (which指代一个句子,没有“正如”、“就像”)
c.当从句的谓语动词是be或相当于联系动词的seem, become等时,可用as或which作主语。

但当从句
的谓语是行为动词时,只能用which作主语。

例如:
d.
4.as 可用作连词,引导状语从句,构成省略形式“as + 过去分词”这一特殊结构,译成汉语时作用
如定语。

例如:
The bridge as shown in the picture is really wonderful. (as shown = as it is shown 可译为“图中的桥”) See the answers as given at the end of this book. (as given = as it is shown 可译为“书后给出的答案”) English as spoken is Australia is slightly different from British English.
(as spoken = as it is spoken 可译为“在澳大利亚讲得英语”)
请看下列的“as + 过去分词”结构用于修饰前面的名词:
The study as described in the article…如文章中描述的那种学习
The program as conducted by…由…指挥的(指导的)节目
The art as applied to medicine…应用于医学的艺术
The products as seen on TV…电视上看到得产品
请看下列常见的“as + 过去分词”结构:
as described - as explained - as done - as given - as imagined - as instructed - as listed - as mentioned - as needed - as required - as taught - as written。

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