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when和while的區(qū)別(編輯修改稿)

2025-09-13 00:01 本頁面
 

【文章內(nèi)容簡介】 學(xué)生們邊聽課邊做筆記。 二、when從句的謂語動詞可以在主句謂語動作之前、之后或同時發(fā)生;while和as從句的謂語動作必須是和主句謂語動作同時發(fā)生。 1.從句動作在主句動作前發(fā)生,只用 when。 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,他休息了一會兒。 ②When I got to the airport,the guests had left.(got to后發(fā)生)當(dāng)我趕到飛機(jī)場時,客人們已經(jīng)離開了。 2.從句動作和主句動作同時發(fā)生,且從句動作為延續(xù)性動詞時,when,while,as都可使用。 ①When /While /As we were dancing,a stranger came in.(dance為延續(xù)性動詞)當(dāng)我們跳舞時,一位陌生人走了進(jìn)來。 ②When /While /As she was making a phonecall,I was writing a letter.(make為延續(xù)性動詞)當(dāng)她在打電話時,我正在寫信。 3.當(dāng)主句、從句動作同時進(jìn)行,從句動作的時間概念淡化,而主要表示主句動作發(fā)生的背景或條件時,只能用 as。這時,as常表示“隨著……”;“一邊……,一邊……”之意。 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。 ③As years go by,China is getting stronger and richer.隨著時間一年一年過去,中國變得越來越富強(qiáng)了。 ④The little girls sang as they went.小姑娘們一邊走,一邊唱。 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。 4.在將來時從句中,常用when,且從句須用一般時代替將來時。 ①You shall borrow the book when I have finished reading it.在我讀完這本書后,你可以借閱。 ②When the manager es here for a visit next week,Ill talk with him about this.下周,經(jīng)理來這參觀時,我會和他談?wù)劥耸隆?三、when用于表示“一……就……”的句型中(指過去的事情)。 sb.had hardly(=scarcely) done sth.when...=Hardly / Scarcely had sb.done sth.when... ①I had hardly /sc
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