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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 him9.He was reading a book _suddenly the telephone rang.10. _ it began to rain, they were playing chess.11. She saw a taxicoming _ the woman was waitingunder thestreetlight.12.
3、13.The boy was walking down the street a UFO landed.14. the alien was visiting the museum,the boy called the TV station.15.I was cleaning my room the fire broke out.16. Linda shouted his name,some people looked at her.用所给动词适当形式填空the allien was in the museum,I called the police.17.While Jake _(look)f
4、or customers,he _(see)awoman.18. They _(play)footballon the playground when it_(begin) to rain. 19.A strange box _(arrive) while we _ (talk).20. John _(sleep)when someone _(stealh)iscar.21.Father still (sleep)when I (get)up yesterday morning.22.Grandmamorning.(cook) breakfastwhile I(wash) my face th
5、is23.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)basketbaolnl the playgroundfrom 3 to
6、4yesterday 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？Do youwhat youwhen WenchuanEarthquake.3. 当铃声想起的时候，我们正在操场上玩得很开心。 We4. 当妈妈下班回家时，你在做什么？Mum from work?5. 当我在做作业时，有人敲门。，someone6. 当外星人正在买纪念品的时候，那个女孩报了警。on the playground when the bell .the door.答案 1.while 2.when 3
7、.while 4.when 5.while 6.when 7.When8.While 9.When 10.When 11.While 12.when 13.when 14.while15.when 16.when 17.was looking ,saw 18.were playing,began19.arrived, were talking 20.was sleeping, stole 21.was, sleep,got 22.wascooking,was washing 23.was sweeping,left 24,was reading,knock25,doing 26.to keep
8、 27. to see28.were playing1.was raining,took off2. remember , were doing ,took place3.were having fun, rang4.what were you doing when ,came back home5.while /when I was doing my homework ,knocked at 6.while the alienwas buying the souvenirs,the girl called the police. （一）、when ，while都有“当时候”的意思。when
9、既可表示某一点时间，也可以表示某一段时间 。在 when 引导的时间状语从句中，其谓语动词可以是延续性的，也可以是非延续性的，可与主句中的谓语动词同时发生，也可在其后发生。1、I was just reading a book when she came into my room.她走进我房间时，我正在看书。2、Were you writing when the teacher came in?老师进来的时候，你在写信吗？3、When he was a child he was always trying out new ideas.他小时候就常常试验一些新的设想。（二）、while 只能表示
10、某一段时间，不能表示某一点时间。在while 引导的时间状语从句中，其谓语动词只能是延续性的，而且也只能与主句中的谓语动词同时发生或存在。例如：1、While Jim was mending his bike, Lin Tao came to see him.正当吉姆修自行车时，林涛来看他。2、You cant do your homework while y orue watching T.V你不能一边看电视一边做家庭作业。（三）、另外，when 和 while的区别还在于：while引导的时间状语从句多用进行时态，而 when 引导的时间状语从句多用一般时态。例如： 1、While the
11、y were talking , the bell rang.正在他们谈话的时候，上课铃响了。2、I was doing my homework when my mother came back homeyesterday 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 watc.h当inPgetTeVr进来的时候我正在看电视。I was watching TV when Peter came i当n.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 while 只能与延续性动词连用。例如：He came in when/ as I was going to我b正ed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。