as的用法總結(jié)
大家在英語學(xué)習(xí)的時(shí)候經(jīng)常會對as的用法感到疑惑，下面小編給大家對as的用法做了總結(jié)，希望可以幫助到大家！
as用法
一、as作連詞的用法
1.as...as的用法
as...as意為"和……一樣"，表示同級的比較。使用時(shí)要注意第一個as為副詞，第二個as為連詞。其基本結(jié)構(gòu)為：as+adj./adv.+as。例如：
(1)Your pen writes as smoothly as mine.你的鋼筆書寫起來和我的一樣流暢。
(2)This film is as interesting as that one.這部電影和那部電影一樣有趣。
其否定式為not as/so+adj./adv.+as。例如：
This dictionary is not as/so useful as you think.這本字典不如你想象的那樣有用。
若有修飾成分，如twice,three times,half,a quarter等，則須置于第一個as之前。例如：
Your bag is twice as expensive as mine.你的袋子比我的貴一倍。
2、as引導(dǎo)時(shí)間狀語從句
此時(shí)，as譯作“當(dāng)……時(shí)候”，可以放在主句之前，也可以放在主句之后。例如：
He smiled as he said goodbye to me.
他向我道別時(shí)微笑了一下。
As she was walking in the park,she heard a girl singing.
她在公園里散步時(shí)，聽到一位女孩在唱歌。
I sang an English song as I went along the river.
我邊沿河邊走邊唱英文歌。
3.as用作連詞引導(dǎo)原因狀語從句
as，because，since都可以表示因果關(guān)系，連接原因狀語從句，含義是"因?yàn)?，由?quot;，但它們有區(qū)別：because表示的語氣最強(qiáng);as一般放在句首，語氣較弱，較口語化;since常常用在書面語中，表示多為對方已知的、或稍加分析便可得知的原因，有時(shí)可譯作"既然"。例如：
(1)He will succeed because he is in earnest.他一定會成功，因?yàn)樗苷J(rèn)真。
(2)Since you are so sure of it he”ll believe you.既然你對此如此有把握，他會相信你的。
(3)As rain has fallen,the air is cooler.因?yàn)橄逻^雨，空氣比較清爽。
4、as引導(dǎo)讓步狀語從句
此時(shí)，as譯作“盡管”。當(dāng)as引導(dǎo)讓步狀語從句時(shí)，不把a(bǔ)s放在從句的開頭，而是將充當(dāng)從句主要成分的形容詞、副詞、分詞、動詞原形或不加冠詞的單數(shù)可數(shù)名詞置于前面。
（1）將表語放在句首，再將as放在表語和主語之間。例如：
Child as he is,he knows quite a lot of things.
雖然他還是個孩子，但他懂得很多事情。
（2）將狀語放在句首，再將as放在狀語（副詞）和主語之間。例如：
Much as she likes,she will not take it.
盡管非常喜歡它，但她也不會拿走的。
（3）將主動詞放在句首，再將as放在主動詞和主語之間。例如：
Try as he did,he didn’t succeed.
盡管他努力了，但還是沒有成功。
二、as作介詞的用法
as作介詞，意思是"作為"，"以……身份"。例如：
He came to China as a tourist five years ago.他五年前以游客的身份來過中國。
三、as作副詞的用法
to the same degree or amount;equally"相同地"，"同樣地"。例如：
They don”t have as many airplanes.他們沒有同樣多的飛機(jī)。
四、as作關(guān)系代詞的用法
as引導(dǎo)英語從句時(shí)，在從句中充當(dāng)主語、賓語、介詞賓語或表語，既可以指人，也可以指物。
1.as單獨(dú)引導(dǎo)定語從句
as單獨(dú)引導(dǎo)定語從句時(shí)，先行詞可以是一個詞，也可以是一個句子或短語。例如：
(1)She is late,as is often the case.她遲到了，這是經(jīng)常的事。(先行詞是整個主句)
(2)To shut your eyes to facts,as many of you do,is foolish.對事實(shí)視而不見--你們好多人都是如此的愚蠢。(先行詞是不定式短語)
2.as引導(dǎo)定語從句與其他詞連用
①用于the same...as結(jié)構(gòu)中
This is the same book as I read last week.這本書和我上周讀的那本是一樣的。
②用于such...as結(jié)構(gòu)中
I don”t like such books as he recommends.我不喜歡他推薦的那些書。
③用于"so+adj.+a/an+n.(單數(shù))+as"結(jié)構(gòu)中
I am not so strong a man as I was.我已經(jīng)沒有從前那么強(qiáng)壯了。
as短語
as well 也；同樣地；還不如
as well as 也；和…一樣；不但…而且
as one 一致的
as soon ◎?qū)幵浮?，寧可?, ◎同樣樂意，同樣愿意(常用于 would，had 之后)[亦作 as lief] , ◎同樣高興(或愿意) , ◎?qū)幵?寧可(與 would, had 連用)
as soon as 一…就…
as long as 只要；和…一樣長
as if 猶如，好似
as much 也；同樣多的
as for 關(guān)于，至于
as soon as possible 盡快
as a whole 總的來說
as far as adv. 至于，直到，遠(yuǎn)到；就…而言
as of 自……起
as though 好像；仿佛
as being 就是；即像
as early as 早在…的時(shí)候
as usual 像往常一樣；照例
as good as 和…幾乎一樣，實(shí)際上等于…
as per 按照，依據(jù)；如同
as such 同樣地；本身；就其本身而論
As 用法專練
1.It is generally believed that teaching is ____ it is a science.
A. much as an art as B. as much an art as
C.an art as much as D.as much as an art
2. _____ I admire David as a poet,I don’t like him as a man.
A.Only if B.If only
C. As much D.Much as
3. ____ ,he talks a lot about his favourite singers after class.
A.A quiet student as he may be B.Quiet student as he may be
C.Quiet as he may be a student D.As he may be a quiet student
4.I wonder why you don’t do it as ____ and it’s the third time you have done so.
A.told you B. be told
C. told to D. you told
5.( 1) ___I explain on the phone,your request will be considered at the next meeting.
(2)____ I explain on the phone is that your request will be considered at the next meeting.
A. What B.When C.After D. As
6.(1)That is ____ problem____can’t be worked out by anyof us .
(2)That is ____problem____none of us can work it out.
A.a such difficult , that B.so difficult a ,that
C.such a difficult, as D.a so difficult ,as
7.There were not so many jobs available ____ were asked for.
A. that B. which C. what D. as
8.____ time went on,Einstine’theory_____ right.
A. With, proved B As, be proved
C.With, be proved D. As, proved
9.He will surely finish the job on time ____ he’s left to do it in his own way.
A.as if B.even if C.so long as D. so that
10.Scientists generally agree that the earth’s climate will warm up over the next 50 to 100
years____it has warmed in the 20,000 years since Ice Age.
A.As long as B.as much as
C.as long as D. as well as
11.Do come to my party,and bring your sister____.
A.as good B.as a whole C.as well D.instead
12.It’s useless trying to argue with the sort of him.You might____ go and stand upon the beach
and argue with the sea.
A as well B also C.as if D. as well as
13.(1) We all passed the exam,but ___ him, he alone failed.
(2) ____ running, learning English needs will.
A. As/as with B. As/as to C.As/as for D.As/as if
14.I thought things would get better, but ___ it is they were gettting worse.
A before B.because C.as D.after
15.All the gifts must be mailed immediately____ in time for Christmas.
A in order to have received B.in order to received
C.so as to be received D.so as to be receiving
16(1)Look! The clouds are gathering. It looks as if it ______ (rain).
(2)If you put a chopstick into water , it looks as if it _____(break)
Answers:
1-4 B D B C 5. DA 6.CB 7-10 D D C B
11-12 C A 13.CA 14-15 C C
16.1)is going to rain 2) were broken
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