2013年版英语八下Unit5过去进行时与when、while

1、2013八下unit5过去进行时与when、while,when and while,both of them mean ”当的时候”.,are they the same? no ！,when引导的时间状语从句可以表示一个时间点,也可以表示一个时间段。从句中可以用短暂性动词,也可以用延续性动词。 it was snowing when we got to the airport. 我们到达机场时, 天正下着雪。 my key dropped on the ground when i was walking in the park. 我在公园散步时, 钥匙掉在了地上。,when,while,w

2、hile引导的时间状语从句常指一个时间段,从句中的动词常为延续性的。while有时还可表示主句的动作与从句的动作同时发生。 while he was reading, the phone rang. 他正在看书时, 电话铃响了。 some students were reading while others were writing. 一些学生在读书, 另一些学生在写字。,(2009四川泸州) what were you doing _ zhang fan came in? a. when b. while c. where 【解析】三个选项分别意为“当时”、“与同时”、“哪里”，结合题意“当

3、张凡进来时，你正在做什么？”可排除b、c二项，故选a。,（一）含义及构成 过去进行时表示过去某一时刻或某一段时间正在进行或发生的动作，其结构为：was / were + v. ing。 i/he/she/it was +v-ing (第一三人称单数用was) we/you/they +v-ing,过去进行时,（1）过去进行时的否定句结构为：was / were+ not +v. -ing ，was与not常缩写为wasnt，were与not常缩写为werent。 （2）过去进行时的一般疑问句结构为：was / were +主语+ v. -ing+其他？ （3）过去进行时的特殊疑问句结构为：疑问

4、词+ was / were+主语+v. -ing+其他？,（二）用法 1. 表示过去某一时刻或某一段时间正在进行或发生的动作。与过去某一特定的时间状语连用，常见的有：at 3 oclock yesterday afternoon, in those days, at this time yesterday等。 2. 表示过去一个动作发生时，另一个动作正在进行，持续时间长的动作用过去进行时，常用在while引导的时间状语从句中。,3. 过去进行时的特殊用法。 与go, come, leave, start等瞬间动词连用时，过去进行时表示过去将要进行的动作。,. 用所给词的适当形式填空 1. i

5、_ (help) my mother with housework at ten oclock last sunday. 2. the girl _ (have) a piano lesson at this time yesterday.,过去进行时的用法,was helping,was having,3. they _ (talk) about the film when the teacher came in. 4. while he _ (wait) for the bus, he read a newspaper. 5. he said he was _ (leave) for sh

6、anghai soon.,were talking,was waiting,leaving,. 句型转换 1. kate was drawing pictures when her mother came back. （改为否定句） kate _ _ pictures when her mother came back. 2. she was babysitting her sister at this time yesterday. （改为一般疑问句） _ she _ her sister at this time yesterday?,wasnt drawing,was babysitti

7、ng,3. they were having a party when i knocked at the door. （就划线部分提问） _ _ they _ when you knocked at the door?,what were doing,. 用when或while填空 1. what were you doing _ the earthquake happened? 2. _ i was shopping in the supermarket, i met my friend nancy.,when,while,3. i was sleeping _ my cousin came

8、 to see me. 4. my mother was doing the housework _ i was doing my homework. 5. _ the alien was in the shop, the girl called the police.,when,while,while,1. 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，这些动词既可表示动作，又可表示状态。从句中的动作既可与主句的动作同时发生，又可在主句的动作之前或之后发生。,when和while引导的时间状语从句,2. while表示“在的时候”、“在期间”。它强调主句的动作与从句的

9、动作同时发生或主句的动作发生在从句的动作过程中。while从句中的动词必须是表示动作或状态的延续性动词。,1. what _ (be) you _ (do) when he arrived? 2. jim_ (sleep) when i came in. 3. they _ (watch) tv at 8:00 yesterday evening. 4. now he _ (read) and _.,were,doing,was sleeping,were watching,is reading,writing,a. fill in the blanks with the given word

10、s.,b. translate these sentences into english.,1. 上课铃响时，你在干什么？ what _ you _when the class bell rang? 2. 当我妈妈进来时我正在看书。 i _when my mother came in. 3. 昨天晚上十点钟她正在做饭。 she _ at ten oclock _.,were,doing,was reading,was cooking,last night / yesterday evening,4. 当天开始下雨时, 孩子们正在玩游戏。 the children _ games when it _ to rain. 5. 当我进来时，那只猫逃跑了。 the cat _ when i _.,were playing,began,ran away,came in,6. 飞机在伦敦着陆时, 天正下着雨。 it _ when the plane _ in london. 7. 电话铃响的时候, 我正在吃早饭。 i _ breakfast when the