when.while-as-的區(qū)別用法

1、精選優(yōu)質(zhì)文檔-傾情為你奉上精選優(yōu)質(zhì)文檔-傾情為你奉上專(zhuān)心-專(zhuān)注-專(zhuān)業(yè)專(zhuān)心-專(zhuān)注-專(zhuān)業(yè)精選優(yōu)質(zhì)文檔-傾情為你奉上專(zhuān)心-專(zhuān)注-專(zhuān)業(yè)when, while和as的用法一when，while，as在時(shí)間狀語(yǔ)從句中的區(qū)別：三者均可表示“當(dāng)?shù)臅r(shí)候”，如果主句表示的是短暫的動(dòng)作，而從句表示的是一段時(shí)間，三者可通用。如：I met Kang Li aswhenwhile I was walking along the street當(dāng)我沿街散步時(shí)碰見(jiàn)了康麗。when可以和延續(xù)性動(dòng)詞連用，也可以和短暫性動(dòng)詞連用；而while和as只能和延續(xù)性動(dòng)詞連用。 如： It was snowing when we got

2、to the airport當(dāng)我們到達(dá)機(jī)場(chǎng)時(shí)，天正下著雪。（不能用while） as強(qiáng)調(diào)主句與從句表示的動(dòng)作同時(shí)發(fā)生，as常表示“隨著”；“一邊，一邊；while強(qiáng)調(diào)主句表示的動(dòng)作持續(xù)于while所指的整個(gè)時(shí)間內(nèi)；when可指主、從句所述動(dòng)作同時(shí)或先后發(fā)生。如：As the time went on，the weather got worse（as表示“隨著”之意） He sang as he went along他邊走邊唱。Please write while I read我讀的時(shí)候，請(qǐng)寫(xiě)下來(lái)。When he reached home，he had a little rest回到家后，他休息

3、了一會(huì)兒。when用于表示“一就”的句型中（指過(guò)去的事情）。 somebody had hardly（scarcely） done whenHardly Scarcely had somebody done when I had hardly scarcely closed my eyes when someone knocked at the doorHardly Scarcely had I closed my eyes when someone knocked at the door我剛一閉上眼，就有人在敲門(mén)了。 二.when, while和as都可引導(dǎo)讓步狀語(yǔ)從句： when引導(dǎo)讓步狀

4、語(yǔ)從句，意為“盡管，雖然”相當(dāng)于though或although:They stopped trying when they might have succeeded next time. while引導(dǎo)讓步狀語(yǔ)從句，相當(dāng)于although ，是較為正式的書(shū)面語(yǔ):While I am willing to go, I would like it better that you went.as引導(dǎo)讓步狀語(yǔ)從句必須倒裝，從句中的表語(yǔ)，狀語(yǔ)或動(dòng)詞原形置于句首，若表語(yǔ)為名詞，前置時(shí)省略冠詞。 Child as he is, he knows a lot.Much as I like it, I will

5、 not buy it, for its too expensive.Try as he might, he couldnt find a job.三.when和while可用作并列連詞:when作并列連詞，意為“突然，正在那個(gè)時(shí)候”常運(yùn)用于以下句型中：Somebody be about to dowhenSomebody be on the point of doingwhenSomebody be doing whenSomebody had donewhenWe were having a meeting when someone broke in.We were about to se

6、t off on our way, when it suddenly began to rain. 作并列連詞，意為“而，卻”，表示對(duì)比。He likes pop music, while I am fond of music.四.when和as用于原因狀語(yǔ)從句中:when=since, now that “既然”Why do you want a new job when youve got such a good one already?意為“因?yàn)椤?，指說(shuō)話雙方都知道的原因。As he was not ready in time, we went without him.組題練習(xí)：1. S

7、uccess came _ she began to play leading parts in radio plays.A. While B. as C. when D. if 2. The atmosphere gets thinner and thinner _ the height increases. A. When B. as C. while D. since 3. I was just about to go to sleep_ there was a loud knock on the door. A. While B. when C. as D. since4. They

8、were surprised that a child should work out the problem_ they themselves couldnt.A. When B. where C. until D. while 5. We were swimming in the lake_ suddenly the storm started.A. When B. while C. until D. before 6. I do every single bit of housework_ my husband Bob just does the dishes now and then.

9、 (04高考廣西卷)A. Since B. while C. when D. as 7. _ I accept that he is not perfect, I do actually like the person.(04高考江蘇卷)A. While B. Since C. Before D. Unless8. Jasmine was holidaying with her family in a wildlife park_ she was bitten on the leg by a lion.(04高考上海卷) A. When B. while C. since D. once 9.

10、 _modeling business is by no means easy to get into, the good model will always be in demand.(o4高考浙江卷) A. While B. Since C. As D. If 10. All gases and most liquids and solids expand _ heated. A. as B. while C. before D. when11. We have only three books_ we need five. A. as if B. if C. when D. even t

11、hough 12.How can we explain it to you_? A. while you are listening B. unless you will listen C. as you wont listen D. when you wont listen13._ I had to work to support my family.A. When I was a little child B. While I was a little child C. As I was a little child D. Before I was a little child14._,

12、helicopters flew to the burning building. A. While the firefighters were trying to control the fire B. As the firefighters were trying to control the fire C. As soon as the firefighters were trying to control the fire D. After the firefighters had controlled the fire15. The husband was looking after

13、 the baby_. A. after his wife cooked in the kitchen B. as his wife was cooking in the kitchen C. when his wife was cooking in the kitchen D. while his wife was cooking in the kitchen16. Look at the sun. It is shining._ its sunny, lets go for a walk. A. as B. when C. if D. as soon as17. The sad mother sat on the roadside，shouting_ she was crying. A. what B. when C. as D. which18. Hardly had we entered the room _ it began to rain. A. while B. as C. then D. when19. _, he does get annoyed with her sometimes.(04). A. Although mu