Unit 4 Natural disasters Reading for Writing 学案--高中英语人教版必修第一册.docx

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1、Unit 4 Natural disastersLesson 5 Reading for Writing【学习目标】1继续学习过去进行时。2学习连词as，while和when在过去进行时中的应用。【学习重难点】as，while和when在过去进行时中的应用。【学习过程】when, while, as 都有“当的时候”。1while指一段时间，它所引导的从句中的谓语动词必须是延续的，不可以是瞬间性的动词，如：While he reached there，They were playing basketball. ()While I was waiting for a bus, I met my

2、cousin. ()当强调两个延续性的动作同时发生时，常用“过去进行时+while+过去进行时”。e.g. 当他在打电话的时候，我在写信。I _ _ a letter _ he _ _ a phone call.(While he _ _ a phone call, I _ _ a letter.)当强调某个动作发生时，另一个动作正在进行，用“一般过去时+while+过去进行时”。e.g. 我们正在读书的时候，老师走了进来。The teacher _ in _ we _ _.我妈妈在睡觉的时候，电话铃响了。While my mother _ _, the telephone _.while的使

3、用特点也可以记忆为：while 后面不接一般过去时(即短暂性动词)。2when和as使用范围比while广泛，它们引导的从句中的谓语动词既可以是延续性的，也可以是短暂性的。换言之，能使用while的句子也可以使用when或as替代，如“一般过去时+while/when/as+过去进行时”、“过去进行时+while/when/as+过去进行时”都可以。When 引导的从句含有突然发生的意思：我在街上散步，他突然喊我。I _ _in the street when he called me.as可理解为“随着”随着日子变短，温度开始下降。_ the days are shorter, the _

4、starts to drop.随着时间推移，中国日渐富强。_ time goes by, China is getting richer and stronger.【达标检测】一、根据汉语提示完成句子。1他们那时不在打排球。They _ _ volleyball at that time.2当你回来时，他在看电视吗？_ he _ TV when you came back?3昨天中午他在哪里等你？_ _ he _ for you at noon yesterday?4当我离开时，他正在做家庭作业。He _ _ his homework _ I left.5正当他们扫地的时候，老师进来了。Whi

5、le they_ _ the floor, the teacher came in.二、用所给单词的适当形式填空。1When I _ (go) into the classroom, the teacher _ (show) some pictures to the students.2Millie _ (see) you at the bus stop, _ you _ (wait) for a bus?3Some fans _ (shout) while others _ (sing) with the pop star at that moment.4Its colder today t

6、han it was yesterday. The weather is getting _ (bad)5The radio says it is _ (sun) this morning, but look at the _ (cloud), it_ (rain). 三、首字母填空。1I lost my schoolbag in the rainstorm. I looked for it e_ but couldnt find it.2Its not safe to go there at night, so I have to start off in the d_.3Its wrong to spend too much money on the coat. I dont know how her m_ works.4Could you wait a m_, please? I am coming to you.5There was a big fire in the school. Many students s_ for help. 3 / 3学科网（北京）股份有限公司