《as的用法總結(jié)》ppt課件

1、As 用法小結(jié),as用法歸納,as詞性多，詞義廣，用法靈活?，F(xiàn)將其用法歸納如下：,Ⅰ. 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,①Jack is as tall as his father. ②He doesn’t speak English as/so fluently as you.,Ⅱ.

2、As作連詞，主要引導(dǎo)以下狀語從句：,1. 引導(dǎo)時(shí)間狀語從句。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，另一事立刻發(fā)生。e.g ① He shouted aloud as he ran along. ② I was startled as he opened the door. ③ We

3、 get wiser as we get older.,2. 引導(dǎo)原因狀語從句，與because的用法相近。,,e.g,① As it was getting very late, we soon turned back. ② We must stop writing now, as I have rather a lot of work to

4、 do.,3. 引導(dǎo)方式狀語從句，作“正如，好象，按照”解。主要的句式有as if(as though);just as;just as…as . e.g,① When at Rome, do as Romans do. ② We do farm work as the old peasant teaches us.

5、 ③ When a pencil is partly in a glass of water, it looks as if it were broken. ★ ④ As(it is)in your country, we grow wheat in the north and rice in the south. 正如(像) 你們國家一樣，…… 。,4. 引導(dǎo)條件狀語從句。主要句式有：,as long

6、 as /so long as 只要,e.g As long as you study hard, you will make great progress.,5. 引導(dǎo)讓步狀語從句；作“雖然，盡管”解。這時(shí)從句常用倒?fàn)钫Z序，即把從句中的表語,狀語或動(dòng)詞原形放在as之前。e.g,① Child as she is, she knows a lot. ★ → Though she is a child, she

7、knows a lot. ② Busy as he is, he insists on studying. → Though he is busy, he … . ③ Try as he might, Tom could not get out of the difficulties. → Though

8、he might try, Tom could not get out of the difficulties.,Ⅲ. As作關(guān)系代詞,1.,引導(dǎo)限制性定語從句，用在“such… as”, “the same …as/the same as”“so/as…as”等結(jié)構(gòu)中，e.g,He wished to be such a man as Lei Feng was.,The teacher gave the students so dif

9、ficult a problem ___ no one could work out.He is not the same man ___ he used to be.,①,②,2. 引導(dǎo)非限制性定語從句，用來指代它前面的整個(gè)句子(即先行句)，意思是“這一點(diǎn)”。這個(gè)分句可以放在句首，句中，或句末。e.g,③,This elephant is like a snake, as anybody can see.,,④,As is well

10、 known, oceans cover more than 70% of the earth.,3.,若非限制性定語從句位于句首，句中或句末， 則用as來引導(dǎo)。e.g,As we expected, he completed his task with great success.,①,②,The compass was invented in China, as we know now.,4.,若非限制性定語從句中的謂語動(dòng)詞是 be

11、 said, be known,be expected, be reported , be announced等結(jié)構(gòu)時(shí)，不論是在句首，句中， 句末，都必須as用來引導(dǎo). e.g,As is known to us, Taiwan is part of China.,Ⅳ. As作介詞,1. 作 “如，像”解。e.g,① They got united as one man. ② She spoke o

12、f me as her closed friend.,2. 作“充當(dāng)，作為”解。e.g,③ As a writer, he was famous. ④English is spoken as the first language by most people in Australia.,3. As作為介詞，常和以下動(dòng)詞連用。,regard…as/be known as/consider…as use…as/ descr

13、ibe…as/be remembered as work as/ act as/be honored as/look on as,We regard the sun as the source of most forms of energy.,e.g,Ⅴ. 含as的固定詞組,1.,as soon as→引導(dǎo)時(shí)間狀語從句。 So/as far as I know→在句中作插入語。意思是“據(jù)我所知”。,e.g,As/

14、So far as I know, he will come here next Monday.,,As well as→并列連接詞組，意思是：“和， 同”。當(dāng)其連接兩個(gè)并列主語時(shí)，謂語動(dòng)詞應(yīng)與前面的主語在數(shù)上保持一致。也可以和短 語not only…but also進(jìn)行替換。 e.g,2.,My parents as well as my elder sister enjoy music. 試比較下面句子。,①,My elder s

15、ister as well as my parents enjoys music.,②,Tom studies Japanese as well as Chinese.,Tom studies not only Chinese but also Japanese. ★★,→,as well→譯為“也，還”經(jīng)常放在句尾。與too, also同義詞。(may/might as well)e.g,3.,Come here early,

16、 and bring your brother as well.,So as to do sth./so…as to do sth.→引導(dǎo) 目地或結(jié)果狀語。e.g,4.,He studies hard so as to pass the exam. He was so strong as to carry the heavy box.,5.,such as→意為“例如，諸如”可用來引入同位語，舉一例或數(shù)例說明它與之同位詞的詞 所

17、含的具體內(nèi)容。,e.g,There are different forms of energy, such as heat energy,light energy, sound energy and etc.,6.,as to(=as for/as regards)關(guān)于，至于 as much as/as many as “ 多達(dá)…，達(dá)到… 至多” e.g,There is no doubt as to his honesty.

18、 He can earn as much as 500 dollars a day.,7.,as a result/as a result of(由于……的結(jié)果) as a whole(就整體來說)/as follows(如下 ) as usual (照常)/as a (general) rule(通常) as a matter of fact(事實(shí)上)/as above(如上) as soon as poss

19、ible/as early as possible as quickly as possible,More examples:,① She died as a result of the accident. ② The reasons are as above(as follows). ③ The machine runs as usual. ④ As a matter of fa