人教版八年级下册 Unit5 What were you doing when the rainstorm came？ SectionA Grammar focus 4a-4c 教案

Unit 5 What were you doing when the rainstorm came
第三课时 Grammar focus - 4c
1、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.It's 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)
① I was walking to school when I saw a cat in a tree.
②When 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。
③ While I was sleeping in the bedroom, someone knocked at the door.
④ 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。
⑤ While Andy was waiting for the bus, he was reading a newspaper.
⑥ 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wasn't,
were 变成weren't, 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
1．My father______ still__________ (sleep) when I_______ (get) up yesterday morning.
2．My grandma______________ (cook) breakfast while I_____________ (wash) my face this morning.
3．My mother________________(sweep)the floor when I____________ (leave) home.
4．The 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.
A．has cooked B．was cooking
C．will cook D．cooks
（ ）2. [2016·威海 ]—I called you yesterday evening. But nobody answered.
—Oh, sorry. Maybe I _____ in the bathroom at that time.
A．take a shower B．took a shower C．was taking a shower
6、家庭作业
1.背诵 Grammar Focus
2.用4c 编一个对话
3.预习P37
七、反思
在本课教学中，不仅要让学生理解和掌握when 和while 在引导时间状语从句时的区别，还要让学生理解：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 引导的动词必须是延续性动词。