优秀备选课件M8-Unit3Languageinuse幻灯片.pptVIP

Accidents Module 8 通过上一模块的学习，我们知道过去进行时可以表示过去某一时刻或时段正在进行或持续的动作，句子常和 at?... yesterday morning, at that time, at?... last night 等时间状语连用。其实，过去进行时还可以和 when, while, as 引导的过去时间状语从句连用，形成复合句。 (1)?While the lights were changing to red, a car suddenly appeared round the corner.? 正当交通信号灯要变成红灯的时候，一辆小轿车突然从拐角处驶出来。 (2)?One day, when Henry was working in a restaurant, a snake suddenly appeared.? 一天，当亨利正在餐馆里工作时，一条蛇突然钻了出来。 (3)?I was trying to pick it up when it bit me again.? 我正试图捡起它（那条蛇），突然它 ( 蛇）又咬了我一口。 (4)?As the doctors were checking him, the pain got worse.? 医生给他做检查时，疼痛加剧了。 下面，让我们来分析 when 和 while 从句与过去进行时连用的几种情况。 1. when 所引导的时间状语既可以指时间点，也可指时间段；while 所引导的时间状语只指时间段。因此，在 when 引导的时间状语从句中，动词可以是终止性动词，也可以是延续性动词；而在 while 从句中，动词必须是延续性动词。例如： They arrived while we were having dinner.? 我们吃饭的时候他们到了。 这句话还可以写成： They arrived when we were having dinner. 2. 由 when 引导的时间状语从句，如果主句用过去进行时、从句用一般过去时，则表示一个动作正在进行的时候另一个动作（突然）发生了，强调后一动作发生的突然性。请看例句： We were talking when the teacher came in.? 我们正在讲话，老师（突然）进来了。 该句也可以用 while 表达，但与用 when 表达有细微的区别，请注意体会： While we were talking, the teacher came in.? 我们正在讲话的时候，老师进来了。（只表明老师进来的事实，不强调突然性） 3. 当主句和从句的动作都是延续的或同时发生的，两句都用过去进行时的时候，多用 while 引导。例如： They were singing while we were dancing.? 他们在唱歌，我们在跳舞。 1. He was listening to music _____ he was riding his bike. 2. I was waiting at the lights _____ I saw the boy fall off his bike. 3. I was walking in the street _____ an accident happened. 4. The driver was talking on his mobile phone ______ he was driving. Complete the sentences with when or while. while when when while Look at what Tony did last Saturday. Complete the You column. Time Tony You 8:30 am-11:30 am playing in the park visiting my grandparents 12:30 pm-1:20 pm having lunch with his friends 2:00 pm-4:00 pm playing football 5:00 pm-6:30 pm doing homework Complete the conversation with the correct form of the words in the box. appear bite show throw Doctor: When did the snake (1)____ you? Henry: Earli