when和while的用法解析、练习题及答案（附总结表格） 一、讲解三例句: 1. The girls are dancing while the boys are singing. 2. Lucy’s mother is cooking when she gets home. 3. When/While Lucy’s mother is cooking, she gets home. 二、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. ______ it began to rain, they were playing chess. 10. She saw a taxi coming ______ the woman was waiting under the streetlight. 三、语法 while和when都是表示同时，到底句子中是用when还是while主要看主句和从句中所使用 的动词是短暂性动作(瞬时动词)还是持续性动作。 1、若主句表示一个短暂性动作，而从句表示的是一个持续性动作时，用When/While。如: He fell asleep when while he was reading. 他看书时睡着了。 I met him when while I was taking a walk in the park. 我在公园散步时遇到了他。 2、若主、从句表示的是两个同时(或几乎同时)发生的短暂性动作，一般要用 when。如: I thought of it just when you opened your mouth. 就在你要说的时候，我也想到了。 3、若主句是一个持续性动作，而从句是一个短暂性动作，用when 如: When he came in, I was listening to the radio. 他进来时，我在听收音机。 It was raining hard when we arrived. 我们到达时正下着大雨。 4、若主、从句表示两个同时进行的持续性动作，且强调主句表示的动作延续到从句所指的 整个时间，通常要用 while。如: Don’t talk while you’re eating. 吃饭时不要说话。 I kept silent while he was writing. 在他写的时候，我默不作声。 至于什么是短暂性动作，什么是持续性动作，其实有个很简单的规律。就是如果是进行时态， 一般是持续性的。如果是过去式，一般是短暂性动作。 四、表格总结 主句 从句 短暂性动作 持续性动作 When/While 短暂性动作 短暂性动作 When 持续性动作 短暂性动作 When 持续性动作 持续性动作 while 五、习题答案(第2、10两道题目需要注意) When/While 1 When 2 While 3 When 4 When/While 5 When 6 When 7 When/While 8 When 9 When/While 10 本文来源：https://www.wddqw.com/doc/cfda060e677d27284b73f242336c1eb91a373326.html