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1、精品教学课件设计| Excellent teaching plan1 过去进行时过去进行时由 was 或 were+ 动词 ing 构成，表示在过去某一时刻或某一段时间正在进行的动作。时间状语有at this/ that time yesterday ， at 8.00 last Sunday, then ，when 或 while 引导的时间状语从句，特定的过去时间有上下文的暗示。例如：1 . He was watching TV at eight yesterday evening.2 .What were you doing at this time yesterday?I was ta
2、lking with my brother 。3 . The girl was playing the guitar when her friend saw her.4 . While he was cooking dinner, his friend got out of the shower.5 While my mother was washing clothesI was doing my homework.6 .What was Jim doing then?( 上下文暗示)He was walking down the street.2 过去进行时和一般过去时的区别1)过去进行时表
3、示过去正在进行的动作，而一般过去时则表示一个完整的动作。如：They were writing letters to their friends last night .昨晚他们在写信给他们的朋友。(没有说明信是否写完)They wrote letters to their friends last night .他们昨晚写了信给他们的朋友。(表达了他们已写好的意思，整个写的过程已完成。)3 练习下列句子：What were you doing when the UFO arrived?cutting my hair (in the barber shop)cooking dinner (in
4、 the kitchen)eating lunch (at school)getting out of the shower (in the bathroom)going to the librarymaking a smoothie (in the kitchen)shouting (on the playground)sleeping (in my bedroom)4 . 以 when 和 while 引导的时间状语从句1 )延续性动词和非延续性动词延续性动词指动作可以延续一段时间，而不是瞬间结束。如：work 、 study 、 drink 、 eat, keep sleep, rela
5、x 等。非延续性动词指动作极为短暂，瞬间结束。如：start 、 begin 、 hit 、 jump 、 knockat ,borrow, lend, open, close 等。 when表示“当的时候”。从句中既可用延续性动词，又可用非延续性动词，这些动词既可以表示动作，又可表示状态。从句中的动作既可和主句的动作同时发生，又可在主句的动作之前或之后发生。如：Mary was having dinner when I saw her .The boy was still sleeping when his mother got home yesterday morning while表示“
6、在的时候”、“在期间”。它强调主句的动作与从句的动作同时 发生或主句的动作发生在从句的动作过程中。 while 从句中必须是表示动作或状态的延续性动词。如：The weather was fine while we were in Beijing .She called while I was out .如果主句的动作在从句的动作过程中发生，从句常用进行时。如。While we were swimming someone stole our clothes .Don t talk so loud while others are working .总结：1. when 可指时间点，又可指时间段
7、，从句中可用延续性动词，也可用非延续性动词。主句用过去进行时态，从句用一般过去时态；主句用现在进行时态，从句用一般现在时态；前后时态范畴保持一致。2. while 总是指一个时间段，从句中必须用延续性动词。从句谓语常用(现在)过去进行时态， (现在)过去主句用进行时态。3. when 当的时候”，是at that time的意思，表示做某种动作的时间或瞬间。常与一 般现在时或一般过去时连用。When winter comes, the weather gets colder and colder.当冬天来临时，天气变得越来越冷 When Linda saw Davy, he was jumpi
8、ng with another dog.当 Linda 看到 Davy 时，他正和另一只狗一起蹦跳着。4. while 当的时候”，是during the time 的意思，表示略长的一段时间。从句常与 现在进行时或过去进行时连用。Mr. White was reading a newspaper while he was waiting for a bus.怀特先生边等车边看报。I am doing my homework while my mother is cooking.我做作业的时候，我妈妈在做饭。二 . 用 when， while 填空1. the alien was in the
9、 museum , I called the police .2. a UFO landed ， the boy was walking down the street.3. winter comes, the weather gets colder and colder 。4. the alien was visiting the museum , the boy called the TV station .5. Mr. White was reading a newspaper - he was waiting for a bus.6. I am doing my homework my mother is cooking.练习：1. He (draw) at eight yesterday evening.2. The girl (shop) when her friend _ (see) her.3. While he _ (cook) dinner, his friend gets out of the shower.4. while he _ (walk) down the street ， he saw the UFO .5. 6.