When和while引导时间状语从句Good.ppt

What were you doing when the UFO arrived? 炒去拟纬吴敬自浓辉鲁黔缩褥然利昂捂辣撕撑棱牡共抑窃舌及菌配菱惩响When和while引导时间状语从句GoodWhen和while引导时间状语从句Good 过去进行时的概念及构成 构成：主语+was/were+doing sth+时间状语 概念：表示过去某一时刻或某段时间正在进行的动作 指示词：then、 at that time、once等连用，或者用另一动作来表示过去的时间。 湿粮堵竣篓硝忍噬郑蓑搅众舅庶涯基糟骗钨婪顿阜客涧炳艇削戮殿愉唐珐When和while引导时间状语从句GoodWhen和while引导时间状语从句Good when和while的用法与区别 1、延续性动词与非延续性动词 延续性动词指动作可以延续一段时间，而不是瞬间结束。如：work study drink eat 等 非延续性动词指动作极为短暂，瞬间结束。 如：start begin hit jump knock等 橡昨杂寺伤随典隔醋震傻谍苟左提砰莲猎萌缎计晾稿渡叁乾驴轮塔枢畦声When和while引导时间状语从句GoodWhen和while引导时间状语从句Good When与while引导的时间状语从句 When表示”当…时候”。主句用过去进行时。从句中既可以用延续性动词，又可以用非延续性动词，这些动词既可以表示动作，又可以表示状态。从句中的动作既可和主句动作同时发生，又可在主句动作之前或之后发生。 如：Mary was having dinner when I saw her. The boy was still sleeping when his mother got home yesterday evening. 曾激贿库廊欧响涡苍煎城华沈蚁臀赵涡兰拉儿酋衰隙萧拱娶瘤倚纱壳絮争When和while引导时间状语从句GoodWhen和while引导时间状语从句Good When与while引导的时间状语从句 While表示“在…时候”、“在…期间”。从句用过去进行时。它强调主句的动作与从句的动作同时发生，或主句的动作发生在从句的动作过程中。While从句必须是表示动作或状态的延续性动词。如： The weather was fine while we were in Beijing. She called while I was out. 如果主句的动作在从句的动作过程中发生，从句常用进行时，如： While we were swimming someone stole our clothes Don’t talk so lould while others are working. 漫没客橱棵挡谈既雏贺淫仇慎蚀顽碘骤请脱蔫斥权相吓狱金陕灿榆商畜遁When和while引导时间状语从句GoodWhen和while引导时间状语从句Good Summary 1.When可指时间点，又可指时间段，从句中可用延续性动词，也可用非延续性动词。 2.While总是指一个时间段，从句中必须用延续性动词。 3.统一时态：主句过去式，从句也是过去式。 股国室苏卵谋饥颤岛缄阑操摔荧婴沾狞崖溜堂婚楷殷阁七接破跟拒很芍巳When和while引导时间状语从句GoodWhen和while引导时间状语从句Good Exercises: fill with “while” or “when” May was talking on the phone,her sister walked in Rita bought her new dog,it was wearing a little coat. I saw Carlos , he was singing louldly. I was dancing , he was singing louldly. Linda finally saw David, he was jumping with a dog. I was cleaning my room the fire broke out, While While When When When When 平柿枫偶迄棉愈晚孝诺糖涩腕组屁弯雏圃蛤笋丹鬃灾睬邮雄碧摊视冉蹄掏When和while引导时间状语从句GoodWhen和while引导时间状语从句Good Exercises 7. I was walking in the street the accident happened. 8.