定語(yǔ)從句as的用法

　　近幾年高考試卷中有關(guān)as一詞的題目出現(xiàn)過很多次，其中as或是最佳選項(xiàng)，接下來要給大家分享的是定語(yǔ)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(dǎo)時(shí)間狀語(yǔ)從句，表示“當(dāng)……的時(shí)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(dòng)作同時(shí)進(jìn)行，意為“一邊……一邊……”，一般不與狀態(tài)動(dòng)詞連用。例如：She sang songs as she did her homework.

　　as 還可以表示一動(dòng)作緊接著另一動(dòng)作發(fā)生，說明另一動(dòng)作的結(jié)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(xiàng)，容易使考生往時(shí)間狀語(yǔ)從句上思考，事實(shí)上本題是強(qiáng)調(diào)句，正確選項(xiàng)是D。

　　2. 引導(dǎo)原因狀語(yǔ)從句，表示“由于，因?yàn)椤�，相�?dāng)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(qiáng)，很多考生誤以為是原因狀語(yǔ)從句，但仔細(xì)分析不難發(fā)現(xiàn)正確答案應(yīng)是A(while表示“只要”)。

　　3. 引導(dǎo)讓步狀語(yǔ)從句，通�？膳calthough或though通用，但語(yǔ)序不同，although或though用于句首，as用于倒裝結(jié)構(gòu)。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(jié)構(gòu)，通常將從句的表語(yǔ)、狀語(yǔ)或動(dòng)詞前置。如果表語(yǔ)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(dǎo)讓步狀語(yǔ)從句用法，但本題不是倒裝結(jié)構(gòu)，故正確答案應(yīng)是D。

　　4. 引導(dǎo)方式狀語(yǔ)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(dòng)詞詞組辨析，題干中的“as planned”給同學(xué)們提供了重要信息，答案選B。

　　5. 固定句型：“主句，as +be/do+主語(yǔ)”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(dāng)作”。例如：As a League member, you should think more of others.

　　3.與某些動(dòng)詞搭配，表示“把……當(dāng)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(yǔ)，運(yùn)用有關(guān)非謂語(yǔ)動(dòng)詞的常識(shí)，可選出正確答案B。

　　三、用作關(guān)系代詞的as

　　1. 引導(dǎo)限制性定語(yǔ)從句，先行詞前通常有as, so, such, same等修飾語(yǔ)。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(xué)們要注意與結(jié)果狀語(yǔ)從句的區(qū)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(jié)果狀語(yǔ)從句，而B句則是定語(yǔ)從句。

　　2. 引導(dǎo)非限制性定語(yǔ)從句，用來指代整個(gè)主句(即先行句)，表示“這一事實(shí)，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(jù)句意，選項(xiàng)C是正確答案。as表現(xiàn)的正是本點(diǎn)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(gòu)成表示比較的結(jié)構(gòu)“asas”，“not asas”。此結(jié)構(gòu)中第一個(gè)as是副詞，第二個(gè)as是連詞。否定結(jié)構(gòu)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(xí)語(yǔ)中的as

　　由as構(gòu)成的習(xí)語(yǔ)很多，常見的有：as soon as “一就”，引導(dǎo)時(shí)間狀語(yǔ)從句;as/so long as “只要”引導(dǎo)條件狀語(yǔ)從句;as if/though “好像，仿佛”，引導(dǎo)方式狀語(yǔ)從句或表語(yǔ)從句;as to/ as for “至于，就而言”;as much/many as“多達(dá)”;as/so far as “就的限度”;as a result，as a result of “(由于的)結(jié)果”;as a matter of fact“事實(shí)上”;as well “也、還”;A as well as B“不但A而且B”;as it is“照現(xiàn)狀看，看樣子”，等等。這些習(xí)語(yǔ)在高考中可能經(jīng)常遇到，在高考題中有的作為正確選項(xiàng)，有的作為干擾項(xiàng)，有的出現(xiàn)在題干，值得同學(xué)們認(rèn)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(xiàng)D極具干擾意義，但進(jìn)一步研讀會(huì)發(fā)現(xiàn)本題中的兩個(gè)分句表達(dá)了一件事的兩個(gè)對(duì)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(xiàng)中雖沒有as內(nèi)容，但題干中的as it is卻是解題的關(guān)鍵信息，正確選項(xiàng)為B。

　　解析定語(yǔ)從句

　　一、賓語(yǔ)從句：

　　賓語(yǔ)從句是由一個(gè)完整的句子構(gòu)成，充當(dāng)賓語(yǔ)修飾謂語(yǔ)動(dòng)詞、介詞和、限定動(dòng)詞和某些形容詞的賓語(yǔ)。如果從句部份是一個(gè)陳述句或是一個(gè)一般疑句(一般疑問句

　　如果做為從句則需變?yōu)殛愂鼍?則通常使用引導(dǎo)詞“that”、“whether”、“if”加上從句部份來構(gòu)成賓語(yǔ)從句。如果從句部份是一個(gè)特殊疑問句，而把特殊疑問詞做引導(dǎo)詞在加

　　上由一般疑問句變來的陳述句來構(gòu)成賓語(yǔ)從句。

　　例1：由that、whether或if引導(dǎo)的賓語(yǔ)從句。

　　1、She saw that her was sleeping. 她看見他在睡覺(修飾謂語(yǔ)動(dòng)詞“saw”)。

　　2、She was intersted in whatever she saw there. 他對(duì)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(yǔ)動(dòng)詞“say”)。

　　例2：由特殊疑問句的特殊疑問詞引導(dǎo)的賓語(yǔ)從句。

　　1、She asked me where I was going. 他問我到那兒去(注意“where”后面的語(yǔ)序)。

　　二、定語(yǔ)從句：

　　在句中起定語(yǔ)作用，修飾某一名詞或代詞，或修飾整個(gè)主句的從句，叫定語(yǔ)從句。被定語(yǔ)從句所修飾的詞稱為“先行詞”。定語(yǔ)從句常跟先行詞后，并由“關(guān)系詞

　　”(引導(dǎo)詞)所引導(dǎo)。對(duì)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(guān)系詞“who”、“whom”、“whose”引導(dǎo)。用“who”引導(dǎo)其條件為定語(yǔ)從句所修飾的先行詞在整個(gè)定語(yǔ)從句中做主語(yǔ)，而且who不能省略。用“whom”引志

　　其條件為定語(yǔ)從句所修飾的先行詞在整個(gè)定語(yǔ)從句中做賓語(yǔ)，但whom可以省略。用“whose”引導(dǎo)其條件為定語(yǔ)從句所修飾的先行詞在從句中做某名詞的定語(yǔ)。

　　2、修飾物一般由關(guān)系詞“that”引導(dǎo)。

　　例1：由關(guān)系詞“who”、“whom”、“whose”引導(dǎo)來修飾人。

　　1、The lady who is standing behind the counter. 那位站在柜臺(tái)后面的女士。

　　2、They’re people whom I met during the rtip. 這些人是我在旅游時(shí)認(rèn)識(shí)的。

　　3、I’m looking after this boy whose parents have gone to shop. 我在照看這個(gè)父母去了商店的男孩。

　　例2：由關(guān)系詞“that”引導(dǎo)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(shí)照的照片。

　　三、狀語(yǔ)從句：

　　狀語(yǔ)從句有很多，新概念一冊(cè)所遇到的有時(shí)間狀語(yǔ)從句。同樣也是由一個(gè)完整的句子構(gòu)成，起到一個(gè)時(shí)間性說明、限定的使用，稱之為“時(shí)間狀語(yǔ)從句”。一般由

　　以下連詞所引導(dǎo)：

　　1、when (當(dāng)…時(shí))

　　2、as (當(dāng)…時(shí)，一邊…一邊)

　　3、while (當(dāng)…時(shí)，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(dāng)我丈夫走進(jìn)飯廳時(shí)，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(dāng)我們正吃早飯時(shí)，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(dāng)我剛打開窗子時(shí)，電話響了。

　　4、She had finished the housework before she went out. 她在做完家務(wù)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(xí)本給我們。

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