as用法總結(jié)

一、 用作連詞的as

1. 引導(dǎo)時(shí)間狀語從句，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作同時(shí)進(jìn)行，意為“一邊……一邊……”，一般不與狀態(tài)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(fā)生，說明另一動作的結(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)原因狀語從句，表示“由于，因?yàn)椤?#xff0c;相當(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.

3.引導(dǎo)讓步狀語從句，通常可與although或though通用，但語序不同，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、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./Try as he would, he couldn’t open the door.

例2 _____ he has limited technical knowledge, the older worker has a lot of experience.

A. Since B. Unless C. As D. Although

解析：as 雖然有引導(dǎo)讓步狀語從句用法，但本題不是倒裝結(jié)構(gòu)，故正確答案應(yīng)是D。

4.引導(dǎo)方式狀語從句，表示“如，像”,相當(dāng)于in the way that 。

例如：When in Rome, do as Romans do./Do to others as you would have others do to you.

例3 We wanted to get home before dark, but it didn’t quite ________ as planned.

A. make out B. turn out C. go on D. come up

解析：本題考查動詞詞組辨析，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”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./After graduating from the college, he firstly worked as a clerk in a big company.

3.與某些動詞搭配，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4. Linda worked for the Minnesota Manufacturing and Mining Company, ________ as 3M.

A. knowing B. known C. being known D. to be known

解析：如果熟悉be known as這一短語，運(yùn)用有關(guān)非謂語動詞的常識，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(xué)們要注意與結(jié)果狀語從句的區(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)果狀語從句，而B句則是定語從句。

2.引導(dǎo)非限制性定語從句，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5 ______ 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。

例6 _______ is our belief that improvements in health care will lead to a stronger, more prosperous economy.

A. As B. That C. This D. It

解析：本題中的as項(xiàng)干擾性很強(qiáng)，容易誤選。實(shí)際上句中that引導(dǎo)的應(yīng)是真正的主語從句，it充當(dāng)形式主語，故選D。如果將題干中的that換為逗號，則必須選as。

例7 Danby left word with my secretary ________ he would call again in the afternoon.

A. who B. that C. as D. which

解析：that引導(dǎo)的從句是word的同位語，本題應(yīng)選B。as無此用法，起干擾作用。

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)“as…as…”，“not as…as…”。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。as…as 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.

The movie was not as good as I had expected./I play tennis as well as him .

五、用在習(xí)語中的as

由as構(gòu)成的習(xí)語很多，常見的有：

as soon as “一……就”，引導(dǎo)時(shí)間狀語從句；

as/so long as “只要”引導(dǎo)條件狀語從句；

as if/though “好像，仿佛”，引導(dǎo)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(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。

例8 I would like a job which pays more, but ______ I enjoy the work I’m doing at the moment.

A. in other words B. 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)對立面，故選B。

例9 ——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 ahead D. 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。

例10 Maggie has been fortunate to find a job she loves and, _____, she gets well paid for it.

A. sooner or later B. what’s more C. as a result D. more or less

解析：本題后一個(gè)分句不表示結(jié)果，而是遞進(jìn)，故選B，而不是C。

例11. The winter of 1990 was extremely bad. _______ most people say it was the worst winter of their lives.

A. At last B. In fact C. In a word D. As a result

解析：選項(xiàng)D. As a result起干擾作用，正確選項(xiàng)為B。

總結(jié)

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