Module 8 unit 3 Language in use（讲解课件PPT）-【优翼·学练优】2023-2024学年八年级上册初二英语同步备课（外研版）

Module 8 Accidents Unit 3 Language in use 外研八年级（上） Learning Objectives 1.use when and while correctly; 2.master the use of past continuous tense; 3.write an accident report by using the past continuous. By the end of the class, we will be able to: Observe the following sentences. While the lights were changing to red, a car suddenly appeared round the corner. I was trying to pick it up when it bit me again. What differences can you find between when and while? when+ 一般过去时， while+过去进行时 3 过去进行时中when和while引导的时间状语从句 过去进行时常和when, while 引导的时间状语连用，构成复合句。两者之间既有相同点，也有不同点。 相同点：when和while都可表示“当······时”，用来引导时间状语从句，表示主句动作发生的背景。 4 不同点1： when可以指时间点，也可以指一段时间，while只指一段时间，因此在引导时间状语从句时，when引导的时间状语从句中的动词可以是瞬间动词，也可以是延续性动词，而while从句中的动词必须是延续性动词。 e.g.We were talking when the teacher came in. 我们正在交谈，这时老师进来了。 They arrived when/while we were having dinner. 当我们正在吃晚饭时，他们到了。 5 不同点2： 由when引导的时间状语从句常用一般过去时，而主句用进行时；如果强调从句和主句的动作同时发生，两句都用过去进行时，且多用while引导从句 e.g.I was walking in the street when the accident happened. 我正在街上散步，这时这起交通事故发生了。 The accident happened when I was walking in the street. 当我正在街上散步时，这起事故发生了。 I saw the accident while I was walking on the road. 当我正在街上散步时，我看见了这起交通事故。 主句 when从句 while从句 过去进行时 一般过去时 过去进行时 一般过去时 过去进行时 过去进行时 6 归纳 如果主句和从句都用了过去进行时，那么从句用 引导; 如果从句是一般过去时，要用 引导；如果主句是 ，从句是 ，从句可用when或while引导。 while when 一般过去时 过去进行时 7 1.Complete the sentences with when or while. 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. while while when when 2. Look at what Tony did last Saturday. Complete the You column. Time Tony You 8:30am— 1:30am playing in the park visiting my grandparents 12:30pm—1:30pm having lunch with his friends 2:00pm—4:00pm