Unit3WhatwereyoudoingwhentheUFOarrived?八道沟镇中学赵媛霖过去进行时的概念及构成构成:主语+was/were+doingsth+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、atthattime、once等连用,或者用另一动作来表示过去的时间。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:workstudydrinkeat等非延续性动词指动作极为短暂,瞬间结束。如:startbeginhitjumpknock等When与while引导的时间状语从句When表示”当…时候”。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:MarywashavingdinnerwhenIsawher.Theboywasstillsleepingwhenhismothergothomeyesterdayevening.When与while引导的时间状语从句While表示“在…时候”、“在…期间”。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:TheweatherwasfinewhilewewereinBeijing.ShecalledwhileIwasout.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:WhilewewereswimmingsomeonestoleourclothesDon’ttalksolouldwhileothersareworking.Summary1.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。Exercises:fillwith“while”or“when”1.Maywastalkingonthephone,hersisterwalkedin2.Ritaboughthernewdog,itwaswearingalittlecoat.3.IsawCarlos,hewassinginglouldly.4.Iwasdancing,hewassinginglouldly.5.LindafinallysawDavid,hewasjumpingwithadog.6.Iwascleaningmyroomthefirebrokeout,WhileWhileWhenWhenWhenWhenExercises7.Iwaswalkinginthestreettheaccidenthappened.8.youhaveameeting,youshouldturnoffyourmobilephone.9.youhavePEclass,youshouldwearsportsshoes.10.Iwasdoingmyhomework,thephonerang.11.itwasraining,theplanetookoff.12.theteacherwasspeakingtoclass,hestoodupsuddenly.whenWhenWhenWhileWhileWhile谢谢观赏Whataredreams?Dreamsareoneofthosethingsthatkeepyougoingandhappy.梦想是什么?梦想是让你感到坚持就是幸福的东西。