英语人教版八年级下册unit5 Grammar Focus -4c.doc

Unit 5 What were you doing when the rainstorm came?第三课时 Grammar focus - 4c1、教学目标： 学生能够用过去进行时谈论过去发生的事情，能够正确运用when和while引导的时间状语从句。2、教学重难点when 和while 引导的时间状语从句的用法及区别教学步骤：一、精彩回顾 用所给词的适当形式填空1.What_ you_ (do) when he arrived? I _(watch) TV at that time.2.Bob _ (shop) when I _(go) to the park.3.I saw some kids_(play) football over there.4.She _(read )books while her mother _(cook) yesterday afternoon.5.Its raining_(heavy) outside.2、 预习热身 写出下列动词的现在分词形式（v-ing）和过去分词形式（v-ed)1. take_ _2. play _ _3.clean_ _4. shop_ _5. sleep_ _6. buy_ _7. leave_ _8. turn_ _9. kid_ _10. hit_ _三、自主学习、小组合作交流1. 小组成员大声朗读Grammar Focus，总结过去进行时的用法，完成探究（一） -过去进行时表示在过去某一时刻或某一段时间段正在进行的_或存在的_。经常和表示_(现在/ 过去）的时间状语连用，如：at this time yesterday，when I called him, from 8:00 to 9:00 last night, at 7:00 last night等。2. 结构：主语+_/ _ + 动词_ +时间状语3. 把肯定句变为否定句时，将 was 改为_,将were 改为 _;一般疑问句是将_或_提到句子前。2. 观察以下句子，思考when 和while 的用法和区别，完成合作探究（二) I was walking to school when I saw a cat in a tree.When Sally arrived home, her mother was cleaning the house. 主句的动作是持续性的，而从句动作是短暂性的，此时用 _ 引导时间状语从句，主句用 _ 时态，从句用一般过去时态。 While I was sleeping in the bedroom, someone knocked at the door. David fell while he was riding his bike. 主句的动作是短暂性的，从句的动作是持续性的，此时用 _ 引导从句，主句用 _ 时态，从句用过去进行时态。 While Andy was waiting for the bus, he was reading a newspaper. He was cleaning his car while I was cooking. 主句和从句的动作在过去的某时刻或某段时间同时发生，而且动作都是持续性的，此时用 _ 引导从句，而且主句和从句都用 _ 时态。3. 小组合作完成4a,4b,4c的练习。三、学生展示、教师点拨1)主句用过去进行时+when 引导的从句用一般过去时2主句用过去进行时+while引导的从句也用过去进行时4、 当堂记忆 （过去进行时用法口诀）过去进行表过去，时态结构记清晰，was,were,助动词，动词-ing 后补齐，否定变化很容易，was 变为wasnt,were 变成werent, 一般疑问也容易，助动词，句提前，末尾问号别忘记，连词while 很重要，后面引起进行时。五课堂练习 （一）用所给词的适当形式填空1My father_ still_ (sleep) when I_ (get) up yesterday morning.2My grandma_ (cook) breakfast while I_ (wash) my face this morning.3My mother_(sweep)the floor when I_ (leave) home.4The students_(have) a biology class when the visitors_ (come) （二）中考连接 单项选择（ ）1. 2016天津 My mother _ dinner when I got home yesterday. Ahas cooked Bwas cooking Cwill cook Dcooks（ ）2. 2016威海 I called you yesterday evening. But nobody answered. Oh, sorry. Maybe I _ in the bathroom at that time. Atake a shower Btook a shower Cwas taking a shower 6、 家庭作业 1.背诵 Grammar Focus 2.用4c 编一个对话 3.预习P