關(guān)于when while as 選擇題，when while這個(gè)問題很多朋友還不知道，今天小六來為大家解答以上的問題，現(xiàn)在讓我們一起來看看吧！
1、when，while，as引導(dǎo)時(shí)間狀語從句的區(qū)別 when，while，as顯然都可以引導(dǎo)時(shí)間狀語從句，但用法區(qū)別非常大。
2、 一、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。
3、 ① Why do you want a new job when youve got such a good one already?(get為短暫性動(dòng)詞)你已經(jīng)找到如此好的工作，為何還想再找新的? ②Sorry，I was out when you called me.(call為短暫性動(dòng)詞)對(duì)不起，你打電話時(shí)我剛好外出了。
4、 ③Strike while the iron is hot.(is為延續(xù)性動(dòng)詞，表示一種持續(xù)的狀態(tài))趁熱打鐵。
5、 ④ The students took notes as they listened.(listen為延續(xù)性動(dòng)詞)學(xué)生們邊聽課邊做筆記。
6、 二、when從句的謂語動(dòng)詞可以在主句謂語動(dòng)作之前、之后或同時(shí)發(fā)生;while和as從句的謂語動(dòng)作必須是和主句謂語動(dòng)作同時(shí)發(fā)生。
7、 1.從句動(dòng)作在主句動(dòng)作前發(fā)生，只用 when。
8、 ①When he had finished his homework，he took a short rest.(finished先發(fā)生)當(dāng)他完成作業(yè)后，他休息了一會(huì)兒。
9、 ②When I got to the airport，the guests had left.(got to后發(fā)生)當(dāng)我趕到飛機(jī)場(chǎng)時(shí)，客人們已經(jīng)離開了。
10、 2.從句動(dòng)作和主句動(dòng)作同時(shí)發(fā)生，且從句動(dòng)作為延續(xù)性動(dòng)詞時(shí)，when，while，as都可使用。
11、 ①When /While /As we were dancing，a stranger came in.(dance為延續(xù)性動(dòng)詞)當(dāng)我們跳舞時(shí)，一位陌生人走了進(jìn)來。
12、 ②When /While /As she was making a phonecall，I was writing a letter.(make為延續(xù)性動(dòng)詞)當(dāng)她在打電話時(shí)，我正在寫信。
13、 3.當(dāng)主句、從句動(dòng)作同時(shí)進(jìn)行，從句動(dòng)作的時(shí)間概念淡化，而主要表示主句動(dòng)作發(fā)生的背景或條件時(shí)，只能用 as。
14、這時(shí)，as常表示“隨著……”;“一邊……，一邊……”之意。
15、 ① As the time went on，the weather got worse.(as表示“隨著……”之意) ② The atmosphere gets thinner and thinner as the height increases.隨著高度的增加，大氣越來越稀薄。
16、 ③As years go by，China is getting stronger and richer.隨著時(shí)間一年一年過去，中國變得越來越富強(qiáng)了。
17、 ④The little girls sang as they went.小姑娘們一邊走，一邊唱。
18、 ⑤The sad mother sat on the roadside，shouting as she was crying.傷心的媽媽坐在路邊，邊哭邊叫。
19、 4.在將來時(shí)從句中，常用when，且從句須用一般時(shí)代替將來時(shí)。
20、 ①You shall borrow the book when I have finished reading it.在我讀完這本書后，你可以借閱。
21、 ②When the manager comes here for a visit next week，Ill talk with him about this.下周，經(jīng)理來這參觀時(shí)，我會(huì)和他談?wù)劥耸隆?/p>
22、 三、when用于表示“一……就……”的句型中(指過去的事情)。
23、 sb.had hardly(=scarcely) done sth.when...=Hardly / Scarcely had sb.done sth.when... ①I had hardly /scarcely closed my eyes when someone knocked at the door.=Hardly / Scarcely had I closed my eyes when someone knocked at the door.我剛一閉上眼，就有人在敲門了。
24、 ②I had hardly /scarcely entered my room when the telephone rang.=Hardly /Scarcely had I entered my room when the telephone rang.我剛一走進(jìn)房門，電話就響了。
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