1、1._ Margo was talking on the phone,her sister walked in.2._ we visited the school,the children were playing games.3._ Sarah was at the barbers,I was going to class.4._ I saw Carlos,he was wearing a green shirt.5._ Allen was cleaning his room,the phone rang.6._ Rita bought her new dog,it was wearing
2、a little coat.7.He was driving along _ suddenly a woman appeared.8. _ Jake was waiting at the door, an old woman called to him 9.He was reading a book _suddenly the telephone rang.10. _ it began to rain, they were playing chess.11. She saw a taxi coming _ the woman was waiting under the streetlight.
3、12.the allien was in the museum,I called the police.13.The boywas walking down the streeta UFO landed.14. the alien was visiting the museum,the boy called the TV station.15.I was cleaning my roomthe fire broke out.16. Linda shouted his name,some people looked at her.用所给动词适当形式填空17.While Jake _(look)
4、forcustomers, he _(see) awoman.18. They _(play) football on the playground when it_(begin) to rain.19.A strange box _(arrive) while we _ (talk).20. John _(sleep) whensomeone _(steal) hiscar.21.Fatherstill(sleep)when I(get)up yesterday morning.22.Grandma(cook) breakfast whileI(wash) my face thismorni
5、ng.23.Mother(sweep)the floor when I(leave)home.24.I(read) a history book when someone(knock) at the door.25.Mary and Alice are busy(do)their homework.26.The teacher asked us(keep) the windows closed.27.I followed it(see)where it was going.28.The students(play)basketball on the playground from 3 to 4
6、yesterday afernoon.完成下面句子，词数不限1. 飞机在伦敦起飞时正在下雨。Itwhen the planein London.2. 你记得汶川大地震时你在做什么吗？DoyouwhatyouwhenWenchuanEarthquake.3. 当铃声想起的时候，我们正在操场上玩得很开心。Weon the playground when the bell.4. 当妈妈下班回家时，你在做什么？Mumfrom work?5. 当我在做作业时，有人敲门。，someonethe door.6. 当外星人正在买纪念品的时候，那个女孩报了警。答案 1.while 2.when 3.while
7、4.when5.while6.when7.When8.While9.When10.When11.While 12.when13.when14.while15.when16.when17.waslooking ,saw18.were playing,began19.arrived, were talking 20.was sleeping, stole 21.was, sleep,got 22.was cooking,was washing 23.was sweeping,left 24,was reading,knock 25,doing 26.to keep 27. to see 28.we
8、re playing 1.was raining,took off2. remember , were doing ,took place 3.were having fun, rang4.what were you doing when ,came back home5.while /when I was doing my homework ,knocked at 6.while the alien was buying the souvenirs,the girl called the police.（一）、when，while 都有“当 候”的意思。when 既可表示某一点 ，也可以表示
9、某一段 。在 when 引 的 状 从句中，其 可以是延 性的，也可以是非延 性的， 可与主句中的 同 生， 也可在其后 生。1、I was just reading a book when she came into my room.她走 我房 ，我正在看 。2、Were you writing when the teacher came in?老 来的 候，你在写信 ？3、When he was a child he was always trying out new ideas.他小 候就常常 一些新的 想。（二）、while 只能表示某一段 ，不能表示某一点 。在while 引 的 状
10、 从句中，其 只能是延 性的，而且也只能与主句中的 同 生或存在。例如：1、While Jim was mending his bike, Lin Tao came to see him.正当吉姆修自行 ，林涛来看他。2、You cant do your homework while youre watching TV.你不能一 看 一 做家庭作 。（三）、另外，when 和 while 的区 在于： while 引 的 状 从句多用 行 ，而when 引 的 状 从句多用一般 。例如：1、While they were talking , the bell rang.正在他们谈话的时候，上课
11、铃响了。2、I was doing my homework when my mother came back home yesterday evening.昨天晚上妈妈回家的时候，我正在做家庭作注意：1) 如主句谓语动词表示的是短暂动作， 从句时间状语指一段时间， when while as 三者可通用。Peter came in while /as I was watching TV.当 Peter进来的时候我正在看电视。I was watching TV when Peter came in.当 Peter 进来时我正在看电视。2) as 和 when 可与非延续性动词连用， 而 whil
12、e 只能与延续性动词连用。例如： He came in when/ as I was going to bed.我正要上床睡觉，他进来了。3) as 和 while 可用来指一段时间，但 as 强调主句与从句表示的动作同时发生， while 强调主句表示的动作是在 while 从句的动作延续中发生。As my mother sang those old songs, tears ran down her cheeks.当我妈妈唱起那些老歌时，眼泪顺着她的脸颊流了下来。I came in while he was reading an interesting book in his room.
