when引導的時間狀語從句

1、when 引導的時間狀語從句 ，不得不提起 as 和 while 一、when可以和延續(xù)性動詞連用，也可以和短暫性動詞連用；而 while和 as只能和延續(xù)性動詞連用。 Why do you want a new job when youve got such a good one already？（ get 為短暫性動詞）你已經(jīng)找到如此好的工作，為何還想再找新的？ Sorry ， I was out when you called me（ call 為短暫性動詞）對不起，你 打電話時我剛好外出了。 Strike while the iron is hot （ is 為延續(xù)性動詞，表示一種持續(xù)

2、的狀態(tài)） 趁熱打鐵。 The students took notes as they listened（ listen 為延續(xù)性動詞）學生們 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。 When he had finished his homework， he took a short rest.（finished 先發(fā) 生）當他完成作業(yè)后，他休息了一會兒。 When I got to the airport ， the guests had l

3、eft（ got to 后發(fā)生）當我趕到 飛機場時，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。 When / While/ As we were dancing a stranger came in （dance 為延續(xù) 性動詞）當我們跳舞時，一位陌生人走了進來。 When While As she was making a phoneca，ll I was writing a letter （ make 為延續(xù)性動詞）當她在打電話時，我正在寫信。 3當主句、從句動作同時進行，從句動作的時間概念淡化，而主要表示主 句動作

4、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。 As the time went on , the weather got worse.（as 表示 隨著之意） The atmosphere gets thi nner and thi nner as the height in creases. 隨著高度 的增加，大氣越來越稀薄。 As years go by, China is getting stronger and riche. 隨著時間一年過去， 中國變得越來越富強了。 The little girls sang as they went.小姑娘們一邊走，一

5、邊唱。 The 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。 You shall borrow the book whe n I have fini shed readi ng it .在我讀完這本書 后,你可以借閱。 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. donesth. when. I had hardly /scarcely closed my eyes when someone knocked at the door. = Hardly/ Scarcely had I closed my eyes whe n some one kno cked at the door .我剛一閉上眼，就有人在敲門了。 I had hardly / scarcely en tered my room whe n the teleph one r