Module 8 AccidentsUnit 3 Language in use Language practice While the lights were changing to red, a car suddenly appeared round the corner.When Henry was trying to find the snake, his hand began to hurt badly.I was trying to pick it up when it bit me again.While the lights were changing to red, a car suddenly appeared round the corner.When Henry was trying to find the snake, his hand began to hurt badly.I was trying to pick it up when it bit me again.过去进行时 ( 二 ) 在上一模块中，我们学习了过去进行时态可以表示过去某一时刻或时段正在进行或持续的动作。常与 on yesterday morning, at that time, last night 等时间状语连用。过去进行时还可以和 when, while 引导的过去时间状语从句连用，形成复合句。Grammarwhen, while, as 作连词时用法有所不同 :1. when 和 while 引导的从句在用法上的区别如下 :(1) when 引导的时间状语既可以指时间点，也可以 指时间段。 while 引导的时间状语只指时间段。•我正试图抓住它，这时它再次咬了我。 I was trying to pick it up when it bit me again. •昨天早上我在公交车站等车时，遇见了我的朋友埃米。 While I was waiting at the bus stop yesterday morning, I met my friend, Amy.(2) when 引导的时间状语从句中动词可用延续 性动词，也可用短暂性动词。 while 引导的 时间状语从句中动词必须是延续性动词。•我们正在交谈，这时，老师进来了。 We were talking when the teacher came in.•我们正吃晚饭时，他们来了。 They arrived when/while we were having dinner.(3) when 引导的时间状语从句与主句的时态 :主句when 从句过去进行时一般过去时一般过去时过去进行时(4) while 引导的时间状语从句与主句的时态 :主句while 从句一般过去时过去进行时过去进行时过去进行时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.1Complete the sentences with when or while.whilewhen3 I was walking in the street _______ an accident...
