Unit5Nature'sTemperSectionA4a-4dGrammarFocus课件人教版英语八年级下册

UNIT5Nature’sTemperSectionA4a-4dGrammarFocusLearningobjectives一、知识目标掌握本课重点词汇与短语：typhoon,havetrouble,bedangerousto,move…off,storefoodandwater等。掌握过去进行时

的基本用法。掌握时间状语从句：when/while/引导从句。二、能力目标能读懂对话，获取台风经历与准备措施的信息。能正确运用和过去进行时描述过去的经历。能使用when/while/连接句子，描述先后或同时发生的动作。三、情感目标了解自然灾害安全常识，增强自我保护意识。学会用英语表达关心与安慰。四、教学重难点重点：过去进行时、when/while/从句。难点：过去进行时,when和while区分使用。Whatwerethetwooldmandoingwhenthetyphoonhit?They_______________(play)chess.wereplayingWhatwasmandoingwhenthetyphoonhit?He___________(read)newspaperonthebench.wasreadingWhatwasboydoingwhenthetyphoonhit?He___________(lie)underatree.waslyingWhatwasthetwokidsdoingwhenthetyphoonhit?They___________(play)withsand.wereplaying行业PPT模板http:///hangye/行业PPT模板http:///hangye/单击此处编辑母版标题样式单击此处编辑母版文本样式单击此处编辑母版文本样式二级三级四级五级小红书：Christina在努力原创课件Readthesentences.Underlinetheverbswhichshowanongoingactioninthepast.Whatwereyoudoingwhileitwassnowingheavily?Iwastravellingonthetrainthen.Whatwereyourfamilydoingwhenthetyphoonhit?MychildrenandIwerereadingtogether.Whenmyneighbourcalled,myfamilywerehavingdinner.Weweredrivinghomewhenthestrongwindsstarted.Whileweweredrivinghome,thestrongwindsstarted.Itwasraininghardwhileweweredrivingback.4a过去进行时：1.概念：表示过去某一时刻或某段时间内正在进行的动作。2.构成：was/were+动词现在分词下大雪的时候你在做什么？那时我正坐火车旅行。台风来袭时，你的家人在做什么？我和孩子们在一起读书邻居打来电话时，我们一家人正在吃晚饭。我们正开车回家，突然刮起了大风。当我们开车回家的时候，刮起了大风。我们开车回去时，雨下得很大。句型结构公式示例肯定句主语+was/were+doingIwasreadingabookat8:00yesterdayevening.否定句主语

+

was/were+not+doingShewas

not(wasn't)watchingTVatthattime.一般疑问句Was/Were+主语+doing?WereyoudoingyourhomeworkwhenIcalled?特殊疑问句

疑问词+was/were+主语+doing？Whatweretheydoing？过去进行时的结构以when和while引导的时间状语从句1)延续性动词和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：read、work、study、drink、eat等。非延续性动词指动作极为短暂，瞬间结束。如：come、start、begin、hit、jump、knock等。Let’slearn1)when可以表示时间点，也可以表示时间段，后面既可以+延续性动词，也可以+非延续性动词，时态既可以是一般过去时，也可以是过去进行时。2)while仅表示时间段，引导表示过去的时间状语从句时，从句的动词必须是延续性动词，时态用过去进行时。E.g.HefellasleepwhilehewaswatchingTV.Thefirealarmwentoffwhilewewerehavingameeting.主句（瞬间动作）+while+从句（持续动作）3)当主句和从句都为过去进行时，只能用while引导，不能用when。E.g.Wewereplayingbasketballwhileitwasraining.主句（持续动作）+while+从句（持续动作）记忆口诀：when后“可长可短”（过去进行时、一般现在时都可以）while后“只能长”（只能用过去进行时）两个动作都是“长动作”（过去进行时），用whileIdidmyhomework.Thetyphoonlandedonthecoast.Thepowerwentout.MyfatherandImadedinner.Katewrotealetter.Herbrothercalledtowarnherofthestorm.Myparentspackedthesupplies.Imovedourthingsoffthefloor.Isleptsoundly.Itrainedcatsanddogs.4bCombineeachpairofsentencesusingwhenorwhile.StepOne圈出两个句子的动词判断是：短动作（瞬间发生）长动作（持续一段时间）短动作长动作短动作长动作长动作短动作长动作长动作长动作长动作StepTwo选连词长动作+when+短动作While+长动作，短动作when+短动作/长动作都可以while后面只能加长动作（过去进行时））whenwhenwhilewhenwhile小口诀长动作when短动作，While只跟长动作。两个都长用while，时态别忘要分清。StepThree变时态长动作→was/were+doing短动作→did（一般过去时））StepFour按结构连成一句，检查通顺。1.Ididmyhomework.Thetyphoonlandedonthecoast.→Iwasdoingmyhomeworkwhenthetyphoonlandedonthecoast.2.Thepowerwentout.MyfatherandImadedinner.→MyfatherandIweremakingdinnerwhenthepowerwentout.3.Katewrotealetter.Herbrothercalledtowarnherofthestorm.→Katewaswritingaletterwhenherbrothercalledtowarnherofthestorm.4.Myparentspackedthesupplies.Imovedourthingsoffthefloor.→Whilemyparentswerepackingthesupplies,Iwasmovingourthingsoffthefloor.5.Isleptsoundly.Itrainedcatsanddogs.→WhileIwassleepingsoundly,itwasrainingcatsanddogs.4cCompletethepassagewithwas,were,when,orwhile.WhenJennylookedup,thickblackcloudswereforminginthesky,andtherain______beatingagainsttheirroof.“Quick,thisway,”saidDad.Thefamilyrantothesaferoomatonce.______theywerewaiting,Jenny'slittlesisterstartedtocry.Dadgavehersomechocolateandtoldherthatthey______hidingfromanangrylion.Soon,shewaslaughingagain.Atlast,thestormpassed.______theysteppedoutside,theyfoundthesunshining.Peoplewereaskingoneanotheriftheyweresafewhilesome______startingtoclearthestreets.Jennysmiled.Thetornadowasscary,butitalsobroughteveryoneclosertogether.wasWhilewereWhenwere4dImaginethatyouareareporter.InterviewamemberofJenny’sfamilyandfindoutwhatheorshewasdoingaroundthetimeofthetornado.MyfamilyandIwerehidinginasaferoom.Whatwereyoudoingwhenthetornadohit?Whatwereyoudoingwhileyouwerewaitingthere?Oh,whileI…"Whatquestionswouldyouask?"内容（展示示范对话）：Reporter:Whatwereyoudoingwhenthetornadohit?Jenny:MyfamilyandIwerehidinginasaferoom.Reporter:Whatwereyoudoingwhileyouwerewaitingthere?Jenny:WhileIwaswaiting,mylittlesisterstartedtocry.Mydadgaveherchocolateandtoldherwewerehidingfromalion.Reporter:That'sclever!Wereyouscared?Jenny:Alittle,butweweretogether,soitwasokay.41练习用was,

were,

when

或

while填空，完成短文。P98

It

1._____a

typical

Saturday

morning.

I

2._____still

sleepingcomfortably

in

my

bed

3.______my

phone

suddenly

started

ringingloudly.

My

brother

4._____making

br