when和while用法区别专项练习讲解三例句：1.Thegirlsaredancingwhiletheboysaresinging.2.Kangkang’smotheriscookingwhenhegetshome.3.When/WhileKangkang’smotheriscooking,hegetshome.一、用when或者while填空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 barber’s,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 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. 二、用所给动词适当形式填空11.While Jake __________(look) for customers, he _______(see) a woman. 12. They __________(play) football on the playground when it _____(begin) to rain. 13.A strange box ________(arrive) while we _________ (talk). 14. John ____________(sleep) when someone __________(steal) his car. 15.Father still (sleep)when I(get)up yesterday morning. 16.Grandma (cook) breakfast while I (wash) my face this morning. 17.Mother (sweep)the floor when I (leave)home. 18.I (read) a history book when someone (knock) at the door. 19.Mary and Alice are busy (do)their homework. 20.The teacher asked us (keep) the windows closed. 21.I followed it (see)where it was going. 22.The students(play)basketball on the playground from 3 to 4 yesterday afternoon. 三、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？DoyourememberwhatyouwhenWenchuanEarthquake.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？ whenMum from work? 5.当我在做作业时，有人敲门。 I was doing my homework,someonethe door. 6.当外星人正在买纪念品的时候，那个女孩报了警。 the alien was buying the souvenirs,the girl the police.
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八年级地理上册填图题岩土工程勘察试题省略号的作用及举例应急救援安全知识车间5s试题及答案
：1.while 2.when 3.while 4.when 5.while 6.when 7.When 8.While9.When 10.When 11.was looking ,saw 12.were playing,began 13.arrived, were talking 14.was sleeping, stole15..was,sleepinggot 16.was cooking,was washing 17.was sweeping,left 18,was reading,knocked19,doing 20.to keep 21. tosee 22.were playing 1.was raining,took off 2.were doing ,took place 3.were having fun, rang 4.what were you doing ,came back home 5.while /when,knocked at 6.while,called
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