篇一：as在定语从句中的详细用法
as引导的定语从句
(1) as引导的定语从句修饰表人或物的先行词，即先行词可以是人也可以是物；在定语从句中可以做主语、宾语或表语；常用于the same?as?/such?as?/as(so)?as?句型，as不论在定语从句中作何成分，均不能省略。
① 先行词为人such teachers， as作主语
②I’ll buy the same bike as I lost yesterday. 先行词为物the same bike，as作宾语 ,指同一类事物 ※此时注意和the same ? that ? 引导的定语从句的区别
It’ that引导定语从句，作宾语，指同一个事物
※ She wore the same dress that she wore at Mary's wedding. (the same?that?特指同一个) 她穿着她在Mary婚礼上穿过的同一条裙子。 (the same?as ?泛指同一类) 她穿着和她妹妹所穿的一样的裙子。 那块手表和我丢失的一模一样。(the same?as ?泛指同一类) 那就是我丢失的那块手表。(the same?that?特指同一个) ③The school is just the same one as it was 10 years ago.
先行词为物the same one (school), as作表语
It’ 先行词为物so heavy a box，as作宾语
此时应注意as引导的定语从句和结果状语从句such / so?that? 的区分
It’ 结果状语从句so? that? 如此? 以至于? ※He is such a good student as is liked by everyone.(定语从句，as在从句中作主语) （结果状语从句such?that?） that在从句中不充当任何成分，故不是定语从句，而是结果状语从句
(2) as引导的非限制性定语从句可以修饰整个主句, 可以放在主句前，主句后或插入主句中间。此时as含有“正如?” 之意。常用的as引导的非限制性定语从句固定表达有：
as we all know / as everyone knows / as is known to all / as is well-known (众所周知)/ as I can remember(正如我所记得的) / as we expect / as was expected (正如预料的那样)/ as often happens / as we all can see / as can be seen / as has been said before (如前所述)…
As everyone knows, Shakespeare is a famous writer.
Shakespeare is a famous writer, as everyone knows.
Shakespeare, as everyone knows , is a famous writer.
(3)注意which引导的非限制性定语从句也可以修饰整个主句, 但不能放在主句前，常译为“这一点、这件事?”。
She is working hard, which everyone can see.which引导的非限制性定语从句不能放在主句前 She is working hard, as everyone can see.﹦As everyone can see, She is working hard.
(4)注意当修饰整个主句时，as引导的非限制性定语从句含“正如”之意，因此在意义上不能和主句相抵触；which引导的非限制性定语从句则无此限制。如： 我们的球队输了比赛，这一点是未预料到的。此时不
能用as。我们的球队赢了比赛，正如预料的那样。
篇二：as在定语从句中的用法
as在定语从句中是关系代词，可做句子成分。但在上述两个句子中，as只是在引导定语从句而已，不作句子成分。
as 引导非限制性定语从句，可放在主句之前，或者主句之后，甚至可以切割一个主句；which引导的非限制性定语从句只能放在主句之后。另外，as有“正如……，正像……”的意思
(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 的用法例
1. the same… as；such…as 中的as 是一种固定结构, 和……一样……。
I have got into the same trouble as he (has).
例2. as可引导非限制性从句，常带有'正如'。
As we know, smoking is harmful to one's health.
As is known, smoking is harmful to one's health.
As是关系代词。例1中的as作know的宾语；
例2中，它充当从句的主语，谓语动词know要用被动式。
一、“as / which” 特殊定语从句的先行成分
1. 形容词或形容词短语作先行成分, 具有形容词意义的介词短语也可以充当先行成分，如：
My grandmother’s house was always of great importance to me, as my own is.
在一定的语言环境里，有些名词可以具有形容词的性质。这些名词主要是那些表示人的身份、职业、状态的名词。值得一提的是，在这些具有形容词性质的名词之后，引导定语从句的关系代词不能用who / whom.
2. 动词短语先行成分。
这种动词短语既可是限定形式也可是非限定形式。如果是动态动词短语，它们在从句中就一般有限定或非限定形式的替代动词do和as / which一起代替。do可以出现，也可以不出现，但不能用其它动词代替。
3. 句子作先行成分。
这句子可以是整个主句也可以只是主句中的一个从句。有时是连续几个句子，有时甚至可以是一个完整的故事。
二、“as/which”特殊定语从句在句中的位置
由于先行成分的构成成分不同，“as/which”特殊定语从句在句中的位置有以下几种情况：
1. 形容词做先行成分时：形容词或形容词短语（含具有形容词性质的名词）作先行成分，“as / which”特殊定语从句置于先行成分之后。
2. 动词短语作先行成分时：动词短语作先行成分时，“as / which”特殊定语从句置于先行成分之后。但是，当从句中含有表示主观意志的插入成分时，“as”特殊定语从句可以移至句子之首。
3. 句子作先行成分时：“as”特殊定语从句的位置较灵活，可以置于先行成分之前、之中或之后。但如果先行成分是直接引语，“as”特殊定语从句多在先行成分之前。如果先行成分是否定句，“as”特殊定语从句与否定词的相对位置不同可以使它产生不同的意义。由于“as”特殊定语从句具有这一特点，所以有时它的位置不能随便移动。在非正式的文体里，“which”
特殊定语从句可以出现在先行成分之中。
三、“as/which”特殊定语从句的语义功能
一般说来，as与which的语义功能相同，可以相互替换。但先行成分为句子时，它们的语义功能则有差异。
1. 表示结果
表示结果的特殊定语从句与其先行成分之间存在着一定的因果关系，从句中往往使用有结果意义的词，如动词result, make, enable, cause和形容词interesting, surprising, delightful, disgraceful等。
2. 表示评注
表示评注的特殊定语从句对其先行成分所述事实的正确性有肯定的倾向，它通常与那些表示客观事实，普遍真理或某种习性的先行成分连用；从句中则常用一些表示“合乎自然规律”、“众所周知”或“经常发生”等意义的词语，如natural, known to all, usual等。
3. 有无状语意义
“as”特殊定语从句具有状语意义（主要是方式状语意义），而“which”特殊定语从句则无状语意义。“as”特殊定语从句的状语意义要求它在语义上与其先行成分的语义保持一致，“which”特殊定语从句则不受这种限制。
四、关系代词as与which的句法功能
1. as / which 在特殊定语从句中作主语。
as作主语时，谓语动词常为连系动词（主要是be, seem），主语补语为usual、 a rule、 a matter of fact等时，系动词be习惯经常省略。行为动词作“as”特殊定语从句的谓语时一般用于被动语态（其中助动词be常略），不及物的行为动词在“as”特殊定语从句中作谓语的极少，常见的有happen一词。如：
Freddie, as might be expected, was attending the conference.
Which作主语时，谓语动词不限，主语被动皆可，只是谓语动词为被动语态时助动词be省略。
2. as和which都可以在特殊定语从句中宾语。
3. as和 which在特殊定语从句中作补语。如：
We thought him a gentleman, as/which he could never be.
“as”特殊定语从句中可以主谓倒装，“which”从句中则不能主谓倒装。
如果先行成分不是主语补语或宾语补语，关系代词用which而不用as。如：
He talked like a native, which/as he hardly was.
4. which在特殊从定语句中作定语。
which可以在特殊定语从句中作定语，修饰fact, matter, thing 等名词。这些名词代表先行成分表达的意义，有时将其略去句义仍然完整。as不能作定语。如：
I was told to go not by train but bus, which advice I followed
as定语从句的用法 及定语从句的主谓一致
整理者：尹广兴
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：① which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。
例如:1. They were satisfied with this decision，as was agreed beforehand.他们对这个决定都满意，这事先已经经过他们同意了。( as在定语从句中作主语，其先行词是this decision)
2. I never heard such stories as he tells.我从未听过他讲的这类故事。( as在定语从句中作宾语，先行词是such stories.)
3.The place doesn't look the same as it was before liberation.这个地方看上一去和解放前大不一样了。( as在定语从句中作表语，先行词是same)
4.Have you bought the same book as I referred to yesterday?你有没有买我昨天说的那本书啊？( as在定语从句中作宾语，先行词是book)
注意:先行词中有the same修饰时，定语从句也可用that引导，但意思上有区别，as表示与
此同类； that表示就是那一个，同物。
as ，which 引导定语从句的辨析与练习2010/04/19 15:48 as 与 which都可以引导一个没有先行词的定语从句，as和which用来代替整个主句或主句中的一个短语。
它们的区别是：
as 引导的从句可以放在主句的前、中、后。对主句起补充说明的作用，解释主句的依据，强调主句确定性等，译为：“正如；由...而知”。从句动词多表示消息来源，如：see，know，expect。结构形式多为：as we know 或 as is known。
which 引导的从句一般都放在主句的后面。说明主句产生的结果，或对主句的内容作出判断，译为：“这...”= and this or but this。从句动词多表示使让、或结果，如：make，break。结构形式多为：which makes me sad或 which is a plan。
以上内容列表如下：
项目as which
相同点 没有先行词，代替整个主句或主句中的一个短语。
区别
位置 在主句的前、中、后。 在主句的后面。
语境 补充说明依据，证明主句的确定性。 主句产生的结果，对主句作出判断。 翻译 正如；由...而知 这= and this/ but this
动词 see,know，expect，imagine，believe make,cause,encourage,break,reach
结构 as we know ; as is supposed which made us sad; which is sad.
1. He said that he was invited, ______ was a lie.
2. _____ can see from the letter he wrote, she is a talented journalist.
3. _____ was expected, he performed the task successfuly.
4. Where there is smoke, there is fire, ______ you know.
5. He said that he lost the book, ________ was untrue.
6. It was raining hard, ______ kept us indoors.
7. Harry is unusaually tall, _______ are his brothers.
8. ________ all his friends agree, he was unusually warm-hearted, loving and generous.
9. They rely on themselves, _______ is much better.
10. Whenever I met him, _______ was fairly often, I like his sweet and hopeful smile.
11. He invited us to dinner, _____ was very kind of him.
12. I am _______ you can imagine short enogh of money.
13. He changed his mind, ______ made me angry.
14. Rats ran about the attic(阁楼) all night, _______ kept her awake.
15. There is great disorder, ______ the newspaper will have told you.
16. He has to work on Sundays, _______ he doesn`t like.
17.Shelley,_______ we had seen, had met her through his uncle.
18. Jack drove too fast , ______ was reckless(不计后果的).
19.Anyway, that evening, ________ I`ll tell you more about later, I survived the traffic accident.
A. whenB. whereC. whatD. which
Keys: 1 which 2 As 3 As 4 as 5 which 6. which 7as 8 As 9 which 10 which 11 which 12 as 13 which 14 which 15 as 16 which 17 as 18 which 19D
例如:Have you brought the same book that I gave you yesterday?
你有没有把我昨天给你的那本书带来啊？( that在定语从句中作宾语，先行词是book。体会：本句中所指的书是同一本，上句中指的是同一类书，而并不就是那一本。)
介词+关系词怎么用？介词加关系词分别等于什么？
答：一、“介词＋关系代词”的用法
当关系代词在定语从句中作介词宾语时，我们通常用“介词＋关系代词”引导定语从句。如果
篇三：as在定语从句中的用法
as在定语从句中的用法
as一般在从句中可担任主宾表。
1. 在限制性定语从句中，当先行词前有such/so/as和the same修饰时，从句的关系代词用as(构成such...as; so...as; as...as; the same...as; 结构) Such people as were recommended by him were reliable.
Such people as I have read are classic works.
I have never seen such a talented young man as he is.
I’d like to use the same tool as is used here.
He is as great a painter as ever lived. In the city, I saw so grand a National Day celebration as I never dreamed of.
2. as在非限制性定语从句中的用法
1) as引导的非限制性定语从句可放在先行词的前中后，表正如(中=主谓之间；此时先行词只能是一句话)
2) as表正如，所以其引导的从句的意义必须和主句和谐一致。
3) as在从句中做谓语时，从句的谓语动词一般是系动词(除了as often happens)
《“as”,用于引起定语从句》
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