定語(yǔ)從句as的用法課件
(一)、 as作連詞的用法:
as作連詞，常用來(lái)連接主句和狀語(yǔ)從句。
1.引導(dǎo)時(shí)間狀語(yǔ)從句，作“當(dāng)...的時(shí)候”解，有“隨著...”之意，與while意義相近，強(qiáng)調(diào)兩個(gè)動(dòng)作同時(shí)發(fā)生;或某事一發(fā)生，另一事立即發(fā)生。eg：
He shouted aloud as her ran along.他一邊往前跑，一邊高聲地呼喊。
I was startled as he opened the door.他一開(kāi)門，我嚇了一跳。
as作連詞，相當(dāng)于when。eg;
As a little boy (When he was a little boy)he began to learn to play piano.他小時(shí)候就開(kāi)始學(xué)彈鋼琴。
2.引導(dǎo)原因狀語(yǔ)從句，作“因?yàn)�，由于”解，與because的用法相近。eg;
I must stop writing now，as I have rather a lot of work to do.我必須停筆了，因?yàn)槲疫�有許多工作要做。
3.引導(dǎo)方式狀語(yǔ)從句或比較狀語(yǔ)從句，作“正如，(如)像”解。例eg：
As in your country，we grow wheat in the north and rice in the south.正如(像)你們國(guó)家一樣，我們?cè)诒狈椒N小麥，在南方種大米。(方式狀語(yǔ)從句)
When at Rome，do as Romans do.入鄉(xiāng)隨俗。(方式狀語(yǔ)從句)
4.引導(dǎo)讓步狀語(yǔ)從句，作“雖然，盡管”解。這時(shí)從句常用倒裝語(yǔ)序，即把從句中的表語(yǔ)、狀語(yǔ)或動(dòng)詞原形放在as之前。eg;
Strange as it may seem，it is true.盡管這事看上去很奇怪，但卻是真的。
Try as he might，Tom could not get out of the difficulties.不管怎樣努力，湯姆還是擺脫不了困境。
1. 作“在-------期間，當(dāng)----的時(shí)候”引導(dǎo)時(shí)間狀語(yǔ)從句.注意與 when、 while的用法區(qū)別。
時(shí)間狀語(yǔ)從句：as的用法
1.某事一發(fā)生，另一事立即發(fā)生
As the sun rose the frog dispersed 太陽(yáng)一出來(lái)霧就消散。
They strolled into the garden as the music ceased. 音樂(lè)聲一停，他們就走進(jìn)花園。
2.在某事發(fā)生的過(guò)程中另一事發(fā)生
I heard the murmur of their voices as I crossed the hall.
我走過(guò)大廳的時(shí)候聽(tīng)到他們?cè)卩止臼裁础?兩個(gè)動(dòng)作都是一般時(shí)態(tài))
Just as he was speaking there was a loud explosion.
正當(dāng)他在說(shuō)話的`時(shí)候，一聲巨響。(從句用進(jìn)行時(shí)態(tài))
3. 兩個(gè)動(dòng)作同時(shí)發(fā)生
He smiled as he passed. 他路過(guò)的時(shí)候笑了一下。
As she sang, the tears ran down her cheeks. 她一邊唱歌，眼淚一邊從臉頰淌下。
Helen heard the story as she washed. 海倫一邊洗衣服一邊聽(tīng)故事。
He saw that she was smiling as she read. 他看到她一邊看著書(shū)一邊笑。
(兩個(gè)都是延續(xù)性動(dòng)作)
We get wiser as we get older. 我們隨著年齡的增長(zhǎng)而變得聰明起來(lái)。
(隨著時(shí)間的變化而變化)
�、傧铝星樾螘r(shí),只用as, 而不用when或while。
1) 用于表示同一個(gè)人的兩種動(dòng)作交替進(jìn)行,指一邊----一邊. 如:
The girl sings as she goes to school.
He looked behind occasionally as he went forward in the forest.
2)表示兩個(gè)同步發(fā)生的動(dòng)作或行為,意思是隨著-----的發(fā)展.如:
As time went on / by, she became more and more beautiful .
As children get older, they become more and more interested in everything.
3)表示兩個(gè)短暫行為或事情幾乎同時(shí)發(fā)生.如:
I watched her as she read the book.
I thought of it just as you opened your mouth.
Just as the flying worm hit her face, she gave a loud cry.
4)接在名詞后面表示某一個(gè)年齡段時(shí).如:
As a young man, he was active in sports.
②when作"當(dāng)……的時(shí)候"解,可以指較短的(一點(diǎn))時(shí)間,也可指一段時(shí)間。如:
When I was at college, I could speak several foreign languages. When the clock struck twelve, I had slept for 2hours.
③while常表示一段較長(zhǎng)的時(shí)間或一個(gè)過(guò)程,強(qiáng)調(diào)主句謂語(yǔ)動(dòng)詞與從句謂語(yǔ)動(dòng)詞同時(shí)發(fā)生。如:Work while you work. Play while you play.
2. As =Since 作"既然"、"由于"解,引導(dǎo)原因狀語(yǔ)從句,常用來(lái)表示已為人們所知或顯而易見(jiàn)的原因或理由。如:
As he’s been ill for ages, I will help him.
As / Since you're not feeling well, you may stay at home.
As he wasn't ready , we went without him.
3.As =in the way that作"像"、"按照……的方式"解,引導(dǎo)方式狀語(yǔ)從句。如:
Do as I told you.
Remember, you must do everything as I do.
4. 用于as--- as或not / so/ as ---- as中, 前一個(gè)as是副詞, 后一個(gè)as是連詞, 引導(dǎo)比較狀語(yǔ)從句。如:
They helped the old as much as possible.
I don't speak English so/ as well as she does.
5. 表示雖然, 盡管 等, 引導(dǎo)讓步狀語(yǔ)從句, 常用倒裝語(yǔ)序, 模式為:
adj. /adv. / n.+as +主語(yǔ)+謂語(yǔ)+主句。如:
Young as he is, he knows much.
Tired as they were, they walked on.
6. 表示也------一樣。
S he is a doctor, as was her husband.
(二)、 as作關(guān)系代詞,引導(dǎo)定語(yǔ)從句,表示正如,這一點(diǎn).如:
1. 引導(dǎo)限制性定語(yǔ)從句，用在“such...as”, “the same...as”，“as...as”等結(jié)構(gòu)中，常譯作“像...一樣的人(或物)”，“凡是...的人(或物)”。
eg： He wished to be such a man as Lei Feng was.他曾希望做一個(gè)像雷鋒那樣的人。
My hometown is no longer the same as it was.我的家鄉(xiāng)再也不像過(guò)去一樣了。
2.引導(dǎo)非限制性定語(yǔ)從句，用來(lái)指代它前面的整個(gè)句子(即先行句)，意思是“這一點(diǎn)”。這個(gè)分句可以位于句首、句中或句末。
eg：As is well known，oceans cover more than 70% of the earth.
我們知道，海洋占地球面積的百分之七十以上。
He is very careful, as we all know.
As is well-known, belongs to China.
另外,當(dāng)先行詞被the same, such等詞修飾時(shí),常用as來(lái)引導(dǎo)定語(yǔ)從句。如:
Such a clever girl as she can learn anything quickly.
I was reading the same book as he bought yesterday.
(三)、as作介詞的用法.
1. 作“如，像”解,表示好像。如:He dressed as a policeman.
They got united as one man.他們團(tuán)結(jié)得像一個(gè)人一樣。
2. 作“充當(dāng)，作為”解,表示作為, 當(dāng)作。如：I found a job as a guide.
As a writer，he was famous.作為作家，他是很有名的。
3.當(dāng)某人是某身份時(shí)。如：As a child , she was sent to abroad.
4.as引導(dǎo)的介詞短語(yǔ)大多用作狀語(yǔ),as譯為"作為";少數(shù)情況可引起賓語(yǔ)補(bǔ)足語(yǔ)。如:
As a Party member, I'll take the lead in everything. (狀語(yǔ))
She works as a model. (狀語(yǔ))
She has me as one of her best friends.(引起賓語(yǔ)補(bǔ)足語(yǔ))
(四)、作副詞的用法
as作副詞，表示程度，意為“同樣地”。在“as...as...”，“not as...as...”結(jié)構(gòu)中的第一個(gè)as是副詞，作“和/與...(不)一樣”解。
e.g. Jack is as tall as his father.杰克和他的父親一樣高。
He doesn't speak English as/so fluently as you.他的英語(yǔ)說(shuō)得不如你流利
1 表示與------等同。
如：This dress is twice as expensive as that one.
2 像，如等。
如：As before, he remained unmoved.
五)含as的固定詞組的用法
1. as soon as作“一…就”解，引導(dǎo)時(shí)間狀語(yǔ)從句。
eg：As soon as I get to Beijing，I'll write to you.我一到北京，就給你寫信。
2.as/so long as作“只要”解，
e.g. As/So long as you study hard，you'll make progress.只要你努力，你就會(huì)取得進(jìn)步。
2. as if/though常用來(lái)引導(dǎo)方式狀語(yǔ)從句，作“好像，仿佛”解。如果從句中講的是非真實(shí)情況，則用虛擬語(yǔ)氣。
e.g. She loves the child as if/though he were her own.
她愛(ài)這個(gè)孩子如同愛(ài)自己的孩子。
3. As if/though也可用來(lái)引導(dǎo)表語(yǔ)從句，常用在“It appears/looks/seems...+as if/though”句型結(jié)構(gòu)中。
e.g. It appears as if/though it is going to clear up.看起來(lái)天要晴了。
It seems as if/though he knew nothing about it.他好像對(duì)此事一無(wú)所知。4.as to作“關(guān)于，至于”解。
e.g. There is no doubt as to his honesty.他的誠(chéng)實(shí)是無(wú)可置疑的。
5.as much/many as作“多達(dá)...”，“達(dá)到...之多”解。
e.g：He can earn as much as 5000 dollars a month.他每月能掙5000美元。
6.so/as far as I know作“就我所知”解，在句中作插入語(yǔ)。
eg： As/So far as I know，he will come here next Monday.
據(jù)我所知，他將于下星期一到這里來(lái)。
7.as a result，as a result of表示“由于...的結(jié)果”。
e.g. She died as a direct result of the accident.她的死是那次事故的直接結(jié)果。
8，as well為“也，還”之意。
e.g. Come early，and bring your brother as well.早點(diǎn)來(lái)，把你的弟弟也帶來(lái)。
9.so as to，so...as to若跟動(dòng)詞原形，表示目的或結(jié)果。
eg：He studied hard so as to pass the exam.他努力學(xué)習(xí)以便通過(guò)考試。(表示目的)
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