Unit5SectionA4a4d课件人教版八年级英语下册

Nature’sTemperNature’sTemperNature’sTemperSectionA–Whathappensduringanaturaldisaster?Unit5八年级下册英语人教版第三课时4a-4dLearningObjectivesInthislessonyouwill:1.understandtheformandfunctionofthepastcontinuoustense.2.differentiatetheuseof“when”and“while”inpastcontinuoustense.3.applythepastcontinuoustenseorallyandinwriting.1.I________16yearsoldthisyear.2.I________15yearsoldlastyear.3.How________theweathertoday?4.How________theweatheryesterday?5.They________goodfriends.6.They________goodfriendsthreeyearsago.amwasiswasarewereFillintheblankswith“be”.写出过去式growgrewtelltakethinkgetringshoptoldtookthoughtgotrangshoppedbecomerunfallbuymakecutsleepranfellboughtmadecutbecamesleptmeanflyheareatgoleavemeantflewheardatewentleftWhatwereyoudoingwhileitwassnowingheavily?Iwastravellingonthetrainthen.Whatwereyourfamilydoingwhenthetyphoonhit?MychildrenandIwerereadingtogether.Whenmyneighbourcalled,myfamilywerehavingdinner.Weweredrivinghomewhenthestrongwindsstarted.Whileweweredrivinghome,thestrongwindsstarted.Itwasraininghardwhileweweredrivingback.Readthesentences.Underlinetheverbswhichshowanongoingactionin

thepast.4aThinkandDiscussWhatarethedifferencesbetweenwhenandwhilewhenusedinpastcontinuoustense?Whatwereyoudoingwhileitwassnowingheavily?Whatwereyourfamilydoingwhenthetyphoonhit?Whenmyneighbourcalled,myfamilywerehavingdinner.Whileweweredrivinghome,thestrongwindsstarted.Itwasraininghardwhileweweredrivingback.Whatwas/were...doingat6:00lastnight?I/He/Shewas/Theywere...1.概念：表示过去某一时刻或某段时间内正进行的动作。2.构成：was/were+动词现在分词3.用法：A：表示某一时刻正进行的行为，与特定的过去

时间状语连用，常见的时间有：at8lastnight,

atthistime,atthattime,atthatmoment等。过去进行时2.现在分词的构成3.1)一般动词在词尾加-ing，如：go→going2)以不发音字母e结尾的动词，

先去掉e，再加-ingcome→coming

make→making

write→writing3)以重读闭音节结尾的动词，如果末尾以一个辅音字母结尾，应先双写这个字母，再加-ing，x和w结尾的除外。get→getting

swim→swimming

show→showing4)以字母y结尾的单词，直接加-ing。如：5)以字母ie结尾的动词，变ie为y，再加-ing。6)以元音字母加e结尾，或以e结尾，且e发音的动词，直接加-ing。

carryingplayingstudying

die→dying

lie→lying

see→seeingbe→being过去进行时的句型肯定句主语+be(was/were)+现在分词+其他E.g.Shewasplayingthepianowhenthebellrang.WhenIcamehome,theywerecookinginthekitchen.否定句主语+be(was/were)+not+现在分词+其他E.g.Hewasn’treadingwhenIcamehome.Whenheknockedatthedoor,weweren’tdoingourhomework.一般疑问句Be(Was/Were)+主语+现在分词+其他?E.g.A:Wereyoucookingatthattime?A:Washesingingthen?B:Yes,hewas./No,hewasn’t.B:Yes,Iwas./No,Iwasn’t.特殊疑问句疑问词+be(was/were)+主语+现在分词+其他?E.g.A:WhatwashedoingwhenIcalledyou?B:Hewasstudyingatthelibrary.A:Whatwereyoudoingwhentheteachercamein?B:Wewerediscussingthehomework.过去进行时中when和while的区别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。E.g.Iwassleepingwhenthedoorbellrang.WhenIwasreadingEnglishwords,mymothercamein.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）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.Iwasreadingwhileshewaswriting.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while1)过去进行时表示过去某一时刻或某一段时间正在进行的动作，而一般过去时则表示在过去某个时间发生过的动作或存在的状态。如：过去进行时和一般过去时的区别5.Theywerewritingletterstotheirfriendslastnight.昨晚他们在写信给他们的朋友。Theywroteletterstotheirfriendslastnight.他们昨晚写了信给他们的朋友。(没有说明信是否写完)(表达了他们已写好的意思，整个写的过程已完成)2)当动作延续较长时间时或表示厌烦、赞美等感情色彩时，常用过去进行时表示。如：Hewasthinkingmoreofothersthanofhimself.他考虑别人的比考虑自己的多。Theboywasalwaysmakingtroublethen.那时，他总是惹麻烦。(表示说话者赞扬的口气)(表示说话者厌烦的口气)现在进行时含义：表示现在正在进行的动作。结构：is/am/are+doing例句：IamhavinganEnglishclass.

过去进行时含义：表示过去某个时刻正在进行的动作。结构：was/were+doing例句：IwashavinganEnglishclassatthistimeyesterday.—Whydidn’tyouopenthedoorforme,Jim?—I

clothesinthebathroom.Ididn’theartheknock.A.amwashing B.havewashedC.waswashingD.washed中考链接——吉姆，你为什么没有给我开门？——（当时）我在浴室洗衣服，没有听到门铃声。过去的某个时间，要用过去进行时。过去进行时和一般过去时的区别一般过去时只表示一个完成的动作，而过去进行时表示过去某时正在进行的动作。也就是说，用一般过去时只是表示有过这件事；用过去进行时则强调了动作的连续性。E.g.ThechildrenwatchedTVyesterdaynight.（只说明昨晚孩子们看过电视，但看了多长时间并不知道。）ThechildrenwerewatchingTVyesterdayevening.（不仅陈述昨晚孩子们看电视这一事实，更强调他们看电视的时间贯穿昨晚整个时间段。）4bCombineeachpairofsentencesusingwhenorwhile.1.Ididmyhomework.Thetyphoonlandedonthecoast.Iwasdoingmyhomeworkwhenthetyphoonlandedonthecoast.2.Thepowerwentout.MyfatherandImadedinner.MyfatherandIweremakingdinnerwhenthepowerwentout.3.Katewrotealetter.Herbrothercalledtowarnherofthestorm.Katewaswritingaletterwhenherbrothercalledtowarnherofthestorm.Combineeachpairofsentencesusingwhenorwhile.4b4.Myparentspackedthesupplies.Imovedourthingsoffthefloor.5.Isleptsoundly.Itrainedcatsanddogs.While

my

parents

were

packing

the

supplies,

I

was

moving

ourthings

off

the

floor.When

I

slept

soundly,

it

was

raining

cats

and

dogs.

rain

cats

and

dogs

下倾盆大雨WhenJennylookedup,thickblackcloudswereforminginthesky,andtherain

beating

againsttheirroof.“Quick,thisway,”saidDad.Thefamilyrantothesaferoomatonce.

theywerewaiting,Jenny’slittlesisterstartedtocry.Dadgavehersomechocolateandtoldherthatthey

hidingfromanangrylion.Soon,shewaslaughingagain.Atlast,thestormpassed.

theysteppedoutside,theyfoundthesunshining.Peoplewereaskingoneanotheriftheyweresafewhilesome

startingtoclearthestreets.Jennysmiled.Thetornado

wasscary,butitalsobroughteveryoneclosertogether.waswereWhileWhen

were4cCompletethepassagewithwas,were,when,orwhile.Imaginethatyouareareporter.InterviewamemberofJenny’sfamilyandfindoutwhatheorshewasdoingaroundthetimeofthetornado.4dA:Whatwereyoudoingwhenthetornadohit?B:MyfamilyandIwerehidinginasaferoom.A:Whatwereyoudoingwhileyouwerewaitingthere?B:Oh,whileI…例如：A:Whatwereyoudoingwhenthetornadohit?

B:MyfamilyandIwerehidinginasaferoom.

A:Whatwereyoudoingwhileyouwerewaitingthere?B:Oh,whileIwaswaitingthere,Istartedtocry.ThenDad

gavemesomechocolateandtoldmethatwewerehiding

fromanangrylion.Soon,Ilaughedagain.过去进行时的基本用法过去进行时的基本句式过去进行时Summary过去进行时和一般过去时的区别was/were+动词-ing①表示过去某一段时间内一直进行的动作，常与thewhole