英语人教版八年级下册unit 5 grammar focus 4a-4c

Unit 5 What were you doing when the rainstorm came? Section A Grammar focus-4c 城关中学 曾秋红教学目的和要求1.重点单词：accident, shape,ice,kid2.重点短语： turn on the radio, have a look3.重点句子:What was Ben doing when it began to rain heavily?What was Jenny doing while Linda was sleeping.The radio talked about a car accident near our home.My brother and I went out right away to have a look.You are kidding.教学重点1.过去进行时。2.when 和while的用法教学难点1.过去进行时。2.when 和while的用法教学过程Step 1 Revision Look at the pictures and make up the sentences. What were you doing when the rainstorm came? I was taking a shower.Step 2 Grammar Focus 读下列句子，能否总结出句子中包含的语法？1. What were you doing at eight last night? I was taking a shower.2. What was she doing at the time of the rainstorm? She was doing her homework.3. What was he doing when the rainstorm came? He was reading in the library when the rainstorm came.4. What was Ben doing when it began to rain heavily?When it began to rain, Ben was helping his mom make dinner. 5. What was Jenny doing while Linda was sleeping? While Linda was sleeping, Jenny was helping Mary with her homework.Step 3 过去进行时1. 基本概念：过去进行时表示在过去某一时刻或一段时间内正在进行的动作。这一特定的过去时间除有上下文暗示以外, 一般用时间状语来表示。2. 结构 was / were + 动词的现在分词3. 句式肯定式：主语+ be (was/were) + doing+其他.否定式: 主语+was/were +not+doing+其他疑问式和简略回答: Was/Were +主语+doing+其他？肯定回答：Yes,主语+was/were.否定回答：No,主语+was/were+not.注：1) was not常缩略为wasnt; were not常缩略为werent。2) 一般过去时与过去进行时用法的比较: 一般过去时表示在过去某个时间发生过的动作或存在的状态, 而过去进行时则表示在过去某一时刻或某一段时间正在进行的动作。3) 现在进行时与过去进行时 现在进行时表示现在正在进行的动作。结构： is/am/are + doing 过去进行时表示过去某个时刻正在进行的动作。结构： was/were + doing Practice: Look at the picture and make up the dialogues.Step 4 过去进行时中的when和whilewhen和while都可表示“当的时候”，引导时间状语从句。你知道两者在过去进行时中的用法有什么不同吗？请仔细观察下面的例句，然后补全空格中的内容。 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_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。Step 5 Work on 4a. Look at the table and write sentences with both while and when.Step 6 Work on 4b. Fill in the blanks with was, were, when or while.Step 7 Work on 4c Speaking What were you doing at these times last Sunday? Fill in the chart.Then ask y