课题：unit5.What were you doing when the rainstorm came?难点名称：能正确使用连词when 和while，能恰当运用过去进行时结构进行提问和叙述。1八年级英语-下册-第五单元导入2When/whilehen/while的相同点的相同点 Father，we succeed in catching them.Baby，although we caught them，they are different！The same：they are both lovelyThe difference：the onelive in the waterthe otherlive on the landlittle animal区别区别知识讲解1.词义难点突破when当.的时候（时间点）I was about to leave my room when some one knocked the door at 11:00AM.while 当.的时候（时间段）It was raining hard while we were watching TV at home fom7:00 to 9:00 in the mornig. Summarywhen 后面一般是跟一个时间点while 后面一般是跟一个时间段时间点时间段at 9:00at 6:00 PMduring morning(9:00-12:00）from 6:00 to 9:00 in the afternoon知识讲解2.时间状语难点突破when用 at 时间（点钟）即可是终止性动词，也可以是延续性动词while during 一段时间必须是延续性动词Summary终止性动词延续性动词learn, work, know, walk,keep ,have ,watch, sing ,read ,sleep,liveopen,begin ,finish ,come ,go,move ,borrow,lend,buy When you called me last night, I was playing the piano.I was bathing last night when Tim was watching TV .while my mom was walking in the garden,I finished homework last day.课堂练习5难点巩固1.leaveborrowbuybegin/startfinishbe awaykeephavebe onbe over当句子用while来引导从句时，主句和从句的动词的动作要同时发生知识讲解难点突破当句子用when引导的从句时，主句的动作和从句可以是同时，也可以是先后发生你想知道when /while引导句子时，主句的变化吗？Lets go!知识讲解难点突破1.when引导的时间状语从句，主句用过去进行时，从句一般用过去时2.如果主句与从句的动作同时发生。都用过去进行时的时候，就要用while小火车，小火车when/while引导的时间状语从句时的时态是怎样的？知识讲解难点突破过去进行时过去进行时2.结构：be doing其中be （was/were）1.定义：过去的某个时间点或时间段正在发生的动作，常和表过去 时间状语从句连用I was doing my homework at this time . They were waiting for you 肯定句 主语was/were doingwas/were doing否定句 主语wasnt/werent doingwasnt/werent doing 疑问句 Was/Were主语doing ?doing ? 特殊疑问句 特殊疑问词疑问句疑问句 ？ whatfor examplefor examplestructures知识讲解难点突破他们/他在那个点正在干什么？过去现在将来at 9:00 last sunday at that time last weekat 6:00pm last day1.What were they doing?at 9:00 last sunday They were doing home work.2.What was he doingat that time last weekHe was playing footballat 6:00pm last day3.What were they doingThey were doing home work?.【课堂小结】【课堂小结】主句和从句的动作在过去的某时刻或某主句和从句的动作在过去的某时刻或某段时间同时发生，而且动作都是持续性段时间同时发生，而且动作都是持续性的，此时用的，此时用 _ 引导从句，而且主引导从句，而且主句和从句都用句和从句都用 _ 时态。时态。我知道while过去进行时小结课堂练习11难点巩固1.When I down, my mother the housework.A:lied; did B:lied; was doing C:was lying; was doing ; D:lay; was doing2.My father was reading a newspaper while my mother dinnerA:is cooking B:cooks C:was cooking D:will cook3.-What were you doing when he_ “hello” to you? I in front of the blackboard.A:was saying; read B:was saying; was reading C:said; read D:said; was reading 4.Tom Cook called his mother every week even while he around the world.A:was traveling B: is traveling C:traveled BCDA6.While John was taking photos, Mary bought a drink.John was taking photos when Mary bought a drink.7.John was playing the piano when Mary left the house.While John was playing the piano, Marythe house.【课堂小结】【课堂小结】Thanks for listening