定語從句as的用法
近幾年高考試卷中有關as一詞的題目出現過很多次，其中as或是最佳選項，接下來要給大家分享的是定語從句as的用法，歡迎大家的借鑒閱讀！
一、用作連詞的as
1. 引導時間狀語從句，表示“當……的時候”，其用法與when和while類似。例如：As a child (When he was a child), she was sent to six different schools.此用法中as多表示從句與主句動作同時進行，意為“一邊……一邊……”，一般不與狀態動詞連用。例如：She sang songs as she did her homework.
as 還可以表示一動作緊接著另一動作發生，說明另一動作的結果，有“隨著……”的含義。例如：As time went by, we found he was an honest man./As he grew older, he lost interest in everything except gardening.
例1 It wasn’t until nearly a month later________ I received the manager’s reply.
A. since B. when C. as D. that
解析：本題的as中與when一起作為干擾項，容易使考生往時間狀語從句上思考，事實上本題是強調句，正確選項是D。
2. 引導原因狀語從句，表示“由于，因為”，相當于because, 但通常置于句首。例如： As he is a qualified doctor, I trust his advice on medical matters.
例2 _____ modeling business is by no means easy to get into, the good model will always be in demand.
A. While B. Since C. As D. If
解析：本題中as干擾性很強，很多考生誤以為是原因狀語從句，但仔細分析不難發現正確答案應是A(while表示“只要”)。
3. 引導讓步狀語從句，通�？膳calthough或though通用，但語序不同，although或though用于句首，as用于倒裝結構。例如：Young as I am, I already know what career I want to follow. /Although(或Though)I am young, I already know what career I want to follow. as 表示讓步用于倒裝結構，通常將從句的表語、狀語或動詞前置。如果表語有冠詞a/an, 需去掉。例如：Great scholar as he is, he is lacking in common sense./Much as I like you, I couldn’t live with you. 例3 _____ he has limited technical knowledge, the older worker has a lot of experience.
A. SinceB. Unless C. As D. Although
解析：as 雖然有引導讓步狀語從句用法，但本題不是倒裝結構，故正確答案應是D。
4. 引導方式狀語從句，表示“如，像”。例如：When in Rome, do as Romans do./Do to others as you would have others do to you.
例4 We wanted to get home before dark, but it didn’t quite ________ as planned.
A. make outB. turn out C. go onD. come up
解析：本題考查動詞詞組辨析，題干中的“as planned”給同學們提供了重要信息，答案選B。
5. 固定句型：“主句，as +be/do+主語”表示“也一樣”。例如：She’s unusually tall, as are both her parents./He’s a doctor, as was his wife before she had children.
二、用作介詞的as
1.表示“如，像”。例如：They got united as one man./She spoke of me as her dearest friend.
2.表示“作為、當作”。例如：As a League member, you should think more of others.
3.與某些動詞搭配，表示“把……當作……”，如：look on…as…, regard…as…, treat…as…, consider…as…, think of…as…, see…as…等。其中consider…as…中的as可以省略。as與famous或known搭配，表示“作為……而出名”。
例5 Linda worked for the Minnesota Manufacturing and Mining Company, ________ as 3M.
A. knowingB. known C. being knownD. to be known
解析：如果熟悉be known as這一短語，運用有關非謂語動詞的常識，可選出正確答案B。
三、用作關系代詞的as
1. 引導限制性定語從句，先行詞前通常有as, so, such, same等修飾語。例如：He will marry as pretty a girl as he can find./My hometown is no longer the same as it used to be./As many people as are present will be given a present.在此種用法中，同學們要注意與結果狀語從句的區別。比如：A: The teacher asked us such a difficult question that none of us could answer it. B: The teacher asked us such a difficult question as none of us could answer.A句為結果狀語從句，而B句則是定語從句。
2. 引導非限制性定語從句，用來指代整個主句(即先行句)，表示“這一事實，那一情況”。從句可以位于句首、句中或句末。例如：We stand when the national anthem is played, as is the custom.
例6 ______ I explained on the telephone, your request will be considered at the next meeting.
A. When B. After C. As D. Since
解析：根據句意，選項C是正確答案。as表現的正是本點所講用法。
四、用作副詞的as
修飾形容詞或副詞，表示程度，意為“同樣地”。例如：He swims fast, but I swim just as fast. 但它通常構成表示比較的結構“asas”，“not asas”。此結構中第一個as是副詞，第二個as是連詞。否定結構中的副詞as可以由so代替。asas possible /one can也屬于此用法。例如：It is generally believed that teaching is as much an art as it is a science.
五、用在習語中的as
由as構成的習語很多，常見的有：as soon as “一就”，引導時間狀語從句;as/so long as “只要”引導條件狀語從句;as if/though “好像，仿佛”，引導方式狀語從句或表語從句;as to/ as for “至于，就而言”;as much/many as“多達”;as/so far as “就的限度”;as a result，as a result of “(由于的)結果”;as a matter of fact“事實上”;as well “也、還”;A as well as B“不但A而且B”;as it is“照現狀看，看樣子”，等等。這些習語在高考中可能經常遇到，在高考題中有的作為正確選項，有的作為干擾項，有的出現在題干，值得同學們認真掌握。例如：
例9 I would like a job which pays more, but ______ I enjoy the work I’m doing at the moment.
A. in other wordsB. on the other hand C. for one thing D. as a matter of fact 解析：選項D極具干擾意義，但進一步研讀會發現本題中的兩個分句表達了一件事的兩個對立面，故選B。
例10 ——People should stop using their cars and start using public transport. ——______. The roads are too crowded as it is.
A. All right B. Exactly C. Go aheadD. Fine
解析：本題選項中雖沒有as內容，但題干中的as it is卻是解題的關鍵信息，正確選項為B。
解析定語從句
一、賓語從句：
賓語從句是由一個完整的句子構成，充當賓語修飾謂語動詞、介詞和、限定動詞和某些形容詞的賓語。如果從句部份是一個陳述句或是一個一般疑句(一般疑問句
如果做為從句則需變為陳述句)則通常使用引導詞“that”、“whether”、“if”加上從句部份來構成賓語從句。如果從句部份是一個特殊疑問句，而把特殊疑問詞做引導詞在加
上由一般疑問句變來的陳述句來構成賓語從句。
例1：由that、whether或if引導的賓語從句。
1、She saw that her was sleeping. 她看見他在睡覺(修飾謂語動詞“saw”)。
2、She was intersted in whatever she saw there. 他對在那無論所看到的都感興趣(修飾介詞“in”)。
3、She didn’t say if her was still alive. 他沒有說他是否還活著(修飾謂語動詞“say”)。
例2：由特殊疑問句的特殊疑問詞引導的賓語從句。
1、She asked me where I was going. 他問我到那兒去(注意“where”后面的語序)。
二、定語從句：
在句中起定語作用，修飾某一名詞或代詞，或修飾整個主句的從句，叫定語從句。被定語從句所修飾的詞稱為“先行詞”。定語從句常跟先行詞后，并由“關系詞
”(引導詞)所引導。對先行詞，無論是人或物起到了加以限制的作用。
1、修飾人稱一般由關系詞“who”、“whom”、“whose”引導。用“who”引導其條件為定語從句所修飾的先行詞在整個定語從句中做主語，而且who不能省略。用“whom”引志
其條件為定語從句所修飾的先行詞在整個定語從句中做賓語，但whom可以省略。用“whose”引導其條件為定語從句所修飾的先行詞在從句中做某名詞的定語。
2、修飾物一般由關系詞“that”引導。
例1：由關系詞“who”、“whom”、“whose”引導來修飾人。
1、The lady who is standing behind the counter. 那位站在柜臺后面的女士。
2、They’re people whom I met during the rtip. 這些人是我在旅游時認識的。
3、I’m looking after this boy whose parents have gone to shop. 我在照看這個父母去了商店的男孩。
例2：由關系詞“that”引導來修飾物。
This is a photo that I took during my trip to Australia. 這是一張我到澳大利亞旅行時照的照片。
三、狀語從句：
狀語從句有很多，新概念一冊所遇到的有時間狀語從句。同樣也是由一個完整的句子構成，起到一個時間性說明、限定的使用，稱之為“時間狀語從句”。一般由
以下連詞所引導：
1、when (當…時)
2、as (當…時，一邊…一邊)
3、while (當…時，在…期間)
4、before (在…以前)
5、after(在…之后) 例：
1、When my husband was going into the dining room this morning,he dropped some coins on the floor. 今早當我丈夫走進飯廳時，把一些硬幣掉在地上了。
2、While we were having breakfast,our little boy found two small coins on the floor. 當我們正吃早飯時，我們的小男孩在地上找到了兩枚小硬幣。
3、Just as I was opening the window,the telephone rang. 當我剛打開窗子時，電話響了。
4、She had finished the housework before she went out. 她在做完家務前出去的。
5、He gave us our exercise books after he had corrected them. 他修改完了后才把練習本給我們。
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