定语从句as的用法

　　近几年高考试卷中有关as一词的题目出现过很多次，其中as或是最佳选项，接下来要给大家分享的是定语从句as的用法，欢迎大家的借鉴阅读！

　　一、用作连词的as

　　1. 引导时间状语从句，表示“当……的时候”，其用法与when和while类似。例如：As a child (When he was a child), she was sent to six different schools.此用法中as多表示从句与主句动作同时进行，意为“一边……一边……”，一般不与状态动词连用。例如：She sang songs as she did her homework.

　　as 还可以表示一动作紧接着另一动作发生，说明另一动作的结果，有“随着……”的含义。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：本题的as中与when一起作为干扰项，容易使考生往时间状语从句上思考，事实上本题是强调句，正确选项是D。

　　2. 引导原因状语从句，表示“由于，因为”，相当于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：本题中as干扰性很强，很多考生误以为是原因状语从句，但仔细分析不难发现正确答案应是A(while表示“只要”)。

　　3. 引导让步状语从句，通常可与although或though通用，但语序不同，although或though用于句首，as用于倒装结构。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 表示让步用于倒装结构，通常将从句的表语、状语或动词前置。如果表语有冠词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 虽然有引导让步状语从句用法，但本题不是倒装结构，故正确答案应是D。

　　4. 引导方式状语从句，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：本题考查动词词组辨析，题干中的“as planned”给同学们提供了重要信息，答案选B。

　　5. 固定句型：“主句，as +be/do+主语”表示“也一样”。例如：She’s unusually tall, as are both her parents./He’s a doctor, as was his wife before she had children.

　　二、用作介词的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“作为、当作”。例如：As a League member, you should think more of others.

　　3.与某些动词搭配，表示“把……当作……”，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与famous或known搭配，表示“作为……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这一短语，运用有关非谓语动词的常识，可选出正确答案B。

　　三、用作关系代词的as

　　1. 引导限制性定语从句，先行词前通常有as, so, such, same等修饰语。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.在此种用法中，同学们要注意与结果状语从句的区别。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句为结果状语从句，而B句则是定语从句。

　　2. 引导非限制性定语从句，用来指代整个主句(即先行句)，表示“这一事实，那一情况”。从句可以位于句首、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：根据句意，选项C是正确答案。as表现的正是本点所讲用法。

　　四、用作副词的as

　　修饰形容词或副词，表示程度，意为“同样地”。例如：He swims fast, but I swim just as fast. 但它通常构成表示比较的结构“asas”，“not asas”。此结构中第一个as是副词，第二个as是连词。否定结构中的副词as可以由so代替。asas possible /one can也属于此用法。例如：It is generally believed that teaching is as much an art as it is a science.

　　五、用在习语中的as

　　由as构成的习语很多，常见的有：as soon as “一就”，引导时间状语从句;as/so long as “只要”引导条件状语从句;as if/though “好像，仿佛”，引导方式状语从句或表语从句;as to/ as for “至于，就而言”;as much/many as“多达”;as/so far as “就的限度”;as a result，as a result of “(由于的)结果”;as a matter of fact“事实上”;as well “也、还”;A as well as B“不但A而且B”;as it is“照现状看，看样子”，等等。这些习语在高考中可能经常遇到，在高考题中有的作为正确选项，有的作为干扰项，有的出现在题干，值得同学们认真掌握。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：选项D极具干扰意义，但进一步研读会发现本题中的两个分句表达了一件事的两个对立面，故选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：本题选项中虽没有as内容，但题干中的as it is却是解题的关键信息，正确选项为B。

　　解析定语从句

　　一、宾语从句：

　　宾语从句是由一个完整的句子构成，充当宾语修饰谓语动词、介词和、限定动词和某些形容词的宾语。如果从句部份是一个陈述句或是一个一般疑句(一般疑问句

　　如果做为从句则需变为陈述句)则通常使用引导词“that”、“whether”、“if”加上从句部份来构成宾语从句。如果从句部份是一个特殊疑问句，而把特殊疑问词做引导词在加

　　上由一般疑问句变来的陈述句来构成宾语从句。

　　例1：由that、whether或if引导的宾语从句。

　　1、She saw that her was sleeping. 她看见他在睡觉(修饰谓语动词“saw”)。

　　2、She was intersted in whatever she saw there. 他对在那无论所看到的都感兴趣(修饰介词“in”)。

　　3、She didn’t say if her was still alive. 他没有说他是否还活着(修饰谓语动词“say”)。

　　例2：由特殊疑问句的特殊疑问词引导的宾语从句。

　　1、She asked me where I was going. 他问我到那儿去(注意“where”后面的语序)。

　　二、定语从句：

　　在句中起定语作用，修饰某一名词或代词，或修饰整个主句的从句，叫定语从句。被定语从句所修饰的词称为“先行词”。定语从句常跟先行词后，并由“关系词

　　”(引导词)所引导。对先行词，无论是人或物起到了加以限制的作用。

　　1、修饰人称一般由关系词“who”、“whom”、“whose”引导。用“who”引导其条件为定语从句所修饰的先行词在整个定语从句中做主语，而且who不能省略。用“whom”引志

　　其条件为定语从句所修饰的先行词在整个定语从句中做宾语，但whom可以省略。用“whose”引导其条件为定语从句所修饰的先行词在从句中做某名词的定语。

　　2、修饰物一般由关系词“that”引导。

　　例1：由关系词“who”、“whom”、“whose”引导来修饰人。

　　1、The lady who is standing behind the counter. 那位站在柜台后面的女士。

　　2、They’re people whom I met during the rtip. 这些人是我在旅游时认识的。

　　3、I’m looking after this boy whose parents have gone to shop. 我在照看这个父母去了商店的男孩。

　　例2：由关系词“that”引导来修饰物。

　　This is a photo that I took during my trip to Australia. 这是一张我到澳大利亚旅行时照的照片。

　　三、状语从句：

　　状语从句有很多，新概念一册所遇到的有时间状语从句。同样也是由一个完整的句子构成，起到一个时间性说明、限定的使用，称之为“时间状语从句”。一般由

　　以下连词所引导：

　　1、when (当…时)

　　2、as (当…时，一边…一边)

　　3、while (当…时，在…期间)

　　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. 今早当我丈夫走进饭厅时，把一些硬币掉在地上了。

　　2、While we were having breakfast,our little boy found two small coins on the floor. 当我们正吃早饭时，我们的小男孩在地上找到了两枚小硬币。

　　3、Just as I was opening the window,the telephone rang. 当我刚打开窗子时，电话响了。

　　4、She had finished the housework before she went out. 她在做完家务前出去的。

　　5、He gave us our exercise books after he had corrected them. 他修改完了后才把练习本给我们。

【定语从句as的用法】相关文章：

定语从句用法07-06