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as在定語從句中的意思
在日常學習、工作和生活中，大家肯定對各類句子都很熟悉吧，借助句子，我們可以更好地表達。其實很多朋友都不太清楚什么樣的句子才是好的句子，下面是小編幫大家整理的as在定語從句中的意思，歡迎閱讀，希望大家能夠喜歡。
as在定語從句中的意思
1. 準關系代詞as引導限制定語從句，用于以下3個結構中，as在從句中作主語、賓語或表語：
a. so / such…as
Such people as were mentioned by him were honest. (as作主語)
I’ve never seen such a clever man as he is. (as作表語)
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 作賓語)
I like the same book as you do. (as 作賓語)
c. as…as
As many children as came were given some cakes. (as 作主語)
He is as diligent a man as ever lived. (as 作主語)
補充：
a. such…as 與 such…that的區別
such…as 引導定語從句;such…that引導結果狀語從句。
They talked in such simple English as children could understand.
他們用孩子們能聽懂的簡單的英語交談。
They talked in such simple English that children could understand it.
他們用十分簡單的英語交談，連孩子們都能聽懂。
I will provide you with such things as you may need.
我要供給你一些你可以用得著的東西。
He shut the window with such a force that the glass broke.
他如此用力地關門，結果玻璃碎了。
b. the same…as與the same…that的區別：
the same…as指兩物相似，the same..描述的是同一物。
This is the same bag as I lost yesterday.
這個書包和我昨天丟失的(書包)相似。(相似物)
This is the same bag that I lost yesterday.
這正是我昨天丟失的那個書包。(同一物)
2. 準關系代詞as引導非限制定語從句。
a. as引導非限制性定語從句，只代表主語或主句的一部分所表達的意思(不能指代某個名詞或代詞)，可以放在主句前，后或中間，在從句中作主語或賓語、例如：
As is known to all, he is the best student in our class. (as指代整個句子，作主語，置于句首)
He opposed the idea, as could be expected. (as 指代整個句子，作主語，置于句末)
As we all know, he studies very hard. (as 指代整個句子，作賓語，置于句首)
Taiwan is, as you know, an inseparable part of China. (as指代整個句子，作賓語，置于句中)
常用的這類句式有：
as is said above 綜上所述 - as is known to all 眾所周知
as is often the case 通常如此 - as is reported in the newspaper 如報紙所報導的
b. 主句具有否定意義，as引導的定語從句位于主句之后時，as指代得主句不包括否定意義，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.我不善言詞,而勃魯特斯卻是個雄辯家.
Spiders are notinsects,as many people think, nor even near1y related to them.
蜘蛛不是昆蟲,盡管許多人認為它是昆蟲,它甚至與昆蟲幾乎沒有關系.
但as引導的定語從句謂語主句前時，as指代的主句仍包括否定意義。
As has been said above, grammar is not a set of dead rules.
正如前面所說的，語法不是一套死條紋。
3. 在非限制性定語從句中，which和as引導定語從句時的區別：
a. which引導的從句不能放在主句前，而as引導的從句則既可以放在主句前，也可以放在主句后。
b. 用能做關系代詞，as和which都可以指代一個句子，但as有“正如”、“就像”之意，which則沒有此含義。
He is a foreigner, as I know from his accent. (as指代一個句子，意為“正如”、“就像”)
He has to work on Sunday, which he doesn’t like. (which指代一個句子，沒有“正如”、“就像”)
c. 當從句的謂語動詞是be或相當于聯系動詞的seem, become等時，可用as或which作主語。但當從句的謂語是行為動詞時，只能用which作主語。
4. as 可用作連詞，引導狀語從句，構成省略形式“as + 過去分詞”這一特殊結構，譯成漢語時作用如定語。例如：
The bridge as shown in the picture is really wonderful. (as shown = as it is shown 可譯為“圖中的橋”)
See the answers as given at the end of this book. (as given = as it is shown 可譯為“書后給出的答案”)
English as spoken is Australia is slightly different from British English.
(as spoken = as it is spoken 可譯為“在澳大利亞講得英語”)
請看下列的“as + 過去分詞”結構用于修飾前面的名詞：
The study as described in the article… 如文章中描述的那種學習
The program as conducted by… 由…指揮的(指導的)節目
The art as applied to medicine… 應用于醫學的藝術
The products as seen on TV…電視上看到得產品
定義
關系代詞引導的定語從句
關系代詞所代替的先行詞是人或物的名詞或代詞，并在句中充當主語、賓語、定語等成分。關系代詞在定語 從句中作主語時，從句謂語動詞的人稱和數要和先行詞保持一致。
1）who, whom,that
這些詞代替的先行詞是人的名詞或代詞，在從句中所起作用如下：
Is he the man who/that wants to see you?
他就是想見你的人嗎？（who/that在從句中作主語） He is the man whom/ that I saw yesterday.
他就是我昨天見的那個人。（whom/that在從句中作賓語）
2) Whose 用來指人或物，(只用作定語, 若指物，它還可以同of which互換）, 例如：
They rushed over to help the man whose car had broken down. 那人車壞了，大家都跑過去幫忙。
Please pass me the book whose (of which) cover is green. 請遞給我那本綠皮的書。
3）which, that
它們所代替的先行詞是事物的名詞或代詞，在從句中可作主語、賓語等，例如：
A prosperitywhich / thathad never been seen before appears in the countryside. 農村出現了前所未 有的繁榮。（which / that在句中作主語）
The packagewhich / thatyou are carrying is about to come unwrapped. 你拿的包快散了。(which / that 在句中作賓語）
關系副詞引導的定語從句
關系副詞可代替的先行詞是時間、地點或理由的名詞，在從句中作狀語。
1）when, where, why
關系副詞when, where, why的含義相當于"介詞+ which"結構，因此常常和"介詞+ which"結構交替使用，例 如：
There are occasions when (on which) one must yield. 任何人都有不得不屈服的時候。
Beijing is the place where (in which) I was born.北京是我的出生地。
Is this the reason why (for which) he refused our offer? 這就是他拒絕我們幫助他的理由嗎？
2）that代替關系副詞
that可以用于表示時間、地點、方式、理由的名詞后取代when, where, why和"介詞+ which"引導的定語從 句，在非正式文體中that常被省略（正式文體中不可省略），例如：
His father died the year (that / when / in which) he was born. 他父親在他出生那年逝世了。
He is unlikely to find the place (that / where / in which) he lived forty years ago. 他不大可能找到他四十 年前居住過的地方。
判斷關系代詞與關系副詞
方法一： 用關系代詞，還是關系副詞完全取決于從句中的謂語動詞。及物動詞后面無賓語，就必須要 求用關系代詞。例如：
（錯） This is the mountain village where I visited last year.
（錯） I will never forget the days when I spent in the countryside.
（對） This is the mountain village (which) I visited last year.
（對） Ill never forget the days (which) I spent in the countryside.
習慣上總把表地點或時間的名詞與關系副詞 where, when聯系在一起。此兩題錯在關系詞的誤用上。
方法二： 準確判斷先行詞在定語從句中的成分(主、謂、賓、定、狀)，也能正確選擇出關系代詞/關系 副詞.先行詞在從句中作主、定、賓語時，應選擇關系代詞；先行詞在從句中作狀語時，應選 擇關系副詞。
例如：（對）Is this the museum which you visited a few days ago?
（對）Is this the museum where the exhibition was held?
定語從句,就是用來修飾名詞或代詞的句子,起到定語的作用,所以叫做定語從句.
定語從句:在復合句中修飾名詞或代詞的句子在復合句中充當定語,所以叫作定語從句.
先行詞：定語從句所修飾的名詞或代詞.
關系詞：引導定語從句的詞,分為關系代詞（who,whom,that,which,whose）和關系副詞(where,when,why,).
復合句 ：The man who (that) came is Mike.
先行詞 關系代詞
Li Ming is the one that got full marks in our class.
先行詞 關系代詞
上句的黑體字為復合句中的主句,藍體字為定語從句.
一 定語從句的關系代詞 Which的用法:若先行詞指物則代替先行詞在定語從句中充當主語或賓語.
This is the pen which was given by my friend.
先行詞 指物代替先行詞在定語從句中充當主語
This is the pen which my friend gave to me.
先行詞 指物代替先行詞在定語從句中充當賓語.
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