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引導(dǎo)的時(shí)間狀語從句,1）延續(xù)性動詞和非延續(xù)性動詞 延續(xù)性動詞指

4、動作可以延續(xù)一段時(shí)間，而不是瞬間結(jié)束。 如：work、study、drink、eat等。 非延續(xù)性動詞指動作極為短暫，瞬間結(jié)束。 如：start、begin、hit、jump、knock等。,Summary,5. 以when和while引導(dǎo)的時(shí)間狀語從句,2）在本單元中，出現(xiàn)了以when和while引導(dǎo)的時(shí)間狀語從句。 when表示“當(dāng)?shù)臅r(shí)候”。從句中既可用延續(xù)性動詞，又可用非延續(xù)性動詞，這些動詞既可以表示動作，又可表示狀態(tài)。從句中的動作既可和主句的動作同時(shí)發(fā)生，又可在主句的動作之前或之后發(fā)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引導(dǎo)的時(shí)間狀語從句, while表示“在的時(shí)候”、“在期間”。它強(qiáng)調(diào)主句的動作與從句的動作同時(shí)發(fā)生或主句的動作發(fā)生在從句的動作過程中。while從句中必須是表示動作或狀態(tài)的延續(xù)性動詞。如： The weather was fine while we were in Beijing . She called while I was out . 如果主句的動作在從句的動作過程中發(fā)生，從句常用進(jìn)行時(shí)。如。 While we were swimming someone stole our clothes . Dont talk so loud while others are working .,1. when可指時(shí)間點(diǎn)，又可指時(shí)間段，從句中可用延續(xù)性動詞，也可用非延續(xù)性動詞。 2. while總是指一個(gè)時(shí)間段，從句中必須用延續(xù)性動詞。,Homework,1,Ma