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1、Section A(3a,3b),Unit 3 What were you doing when the UFO arrived?,Period 2,What were you doing at yesterday? I was,talking on the phone,sleeping,7:00pm,11:00pm,What were you doing at yesterday? I was,studying,playing computer games,10:00am,11:00am,What were they doing at 10:30?,They were running.,Wh
2、at was he doing when they swam in the water ?,He was doing homework.,(land on Center Street),(eat an ice cream),What were the girls doing when the UFO landed?,The girls were eating an ice cream when the UFO landed.,While the girls were eating an ice cream, the UFO landed.,alien,She was sleeping when
3、 her son called her.,What was she doing when her son called her?,While she was sleeping , her son called her.,What was he doing when the UFO took off?,(take off),(come back home),(watch TV),Listening,5,4,3,2,Listening,when,While,when,While,Read and learn,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
4、动作可以延续一段时间，而不是瞬间结束。 如：work、study、drink、eat等。 非延续性动词指动作极为短暂，瞬间结束。 如：start、begin、hit、jump、knock等。,Summary,5. 以when和while引导的时间状语从句,2）在本单元中，出现了以when和while引导的时间状语从句。 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
5、 was still sleeping when his mother got home yesterday morning .,6. 以when和while引导的时间状语从句, while表示“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 . Dont talk so loud while others are working .,1. when可指时间点，又可指时间段，从句中可用延续性动词，也可用非延续性动词。 2. while总是指一个时间段，从句中必须用延续性动词。,Homework,1,Make a few sentences using “when” and “while”.,2, Preview the e-mail message on page 20.,