知识点讲解1onearth在地球上到底,究竟EgWhyonearthdiddothat?2beuseforsth/doingsth对于某事/做某事有用Beusefultodosth做某事很有用3beindanger处于危险中4stopsbfromdoingsth阻止某人做某事练习:1Itistime_______________AgotoschoolBplaygamesCtogohomeDtodomyhomeworks2Heoften_____supperat6:00intheevening.AhaveBhasCishavingDiseating3Itis6o’clockinthemorning.He____________________AgetupBgetsupCisgettingupDisgettingup4We_______anyChineseclassesonFriday.Adon’thaveBaren’thavingBarehavingDarehave5Listen!Thegirl____________intheroom,Shesingssobeautifully.AsingsBsingingCissingingDaresingsing6Theboyis_____withhisteacher.Helooksveryexcited.AsayingBspeakingCtalkingDtelling7Oh,What______inthenextroom.Itissonoisy.AhappensBishappeningChappenedDwillhappen语法点拨1.一般现在时的用法1)表示经常性,习惯性的动作;表示现在的状态,特征和真理。句中常用often,usually,everyday等时间状语,例如:Hegoestoschooleveryday.(经常性动作)Heisveryhappy.(现在的状态)Theearthmovesaroundthesun.(真理)2)在时间状语从句和条件状语从句中,用现在时表示将来,例如:Ifyoucomethisafternoon,we’llhaveameeting.WhenIgraduate,I’llgotothecountryside.Don’tgetoffthebusuntilithasstopped.3)有时这个时态表示按计划,规定要发生的动作。(句中都带有时间状语词)但仅限于少数动词,如:begincome,leave,go,arrive,start,stop,return,open,close等,例如:Themeetingbeginsatseven.Thetrainstartsatnineinthemorning.4)表示状态和感觉的动词。如be,like,hate,think,remember,find,sound等常用一般现在时。例如:IlikeEnglishverymuch.Thestorysoundsinteresting.5)书报的标题,小说等情节介绍常用一般现在时。2.一般过去时的用法1)表示过去某时发生的事,存在的状态或过去反复发生的动作。HesawMr.Wangyesterday.Heworkedinafactoryin1986.2)表示过去经常发生的动作,也可用“usedto”和“would+动词原形”。例如:Iusedtosmoke.DuringthevacationIwouldswiminthesea.注意:usedto表示过去常发生而现在不发生的动作或存在的状态。另外“beusedto+名词(动名词)”表示“习惯于……”。例如:Iamusedtotheclimatehere.Heisusedtoswimminginwinter.3.一般将来时的用法一般将来时表示将来的动作或状态,其表达形式除了“will或shall+动词原形”外,还有以下几种形式。1)“tobegoingto+动词原形”,表示即将发生的或最近打算进行的事。例如:Itisgoingtorain.Wearegoingtohaveameetingtoday.2)go,come,start,move,sail,leave等可用进行时态表示按计划即将发生的动作。例如:I’mleavingforBeijing.3)beto+动词原形”表示按计划要发生的事或征求对方意见。例如:Arewetogoonwiththiswork?Theboyistogotoschooltomorrow.4)“beaboutto+动词原形”表示即将发生的动作。例如:Weareabouttoleave.4.现在进行时的用法1)现在进行时表示现在正在进行的动作,由“tobe+现在分词”构成。例如:Whatareyoudoing?2)表示感觉,愿望和状态的某些动词,如have,be,hear,see,like等词一般不用进行时。5.过去进行时的用法1)过去进行时表示过去某一时刻,某一阶段正进行的动作,由“was(were)+现在分词”构成。例如:In1980hewasstudyinginauniversity.HewasreadinganovelwhenIcamein.练习选择最佳答案填空:1.We_____apartynextweekend.Ihopeyoucancome.A.haveB.willhaveC.hadD.wouldhave2.I_____abookathomewhenIheardaloudnoiseoutsidethebuilding.A.havereadB.wasreadingC.readD.hadread3.--____myglasses?--Yes,Isawthemonyourbedaminuteago.A.DoyouseeB.HadyouseenC.WouldyouseeD.Haveyouseen4.Helen_____herkeyintheofficesoshehadtowaituntilherhusband_____home.A.hadleft;comesB.left;hadcomeC.hadleft;cameD.hadleft;wouldcome5.–Hi,Tracy,youlooktired.--Iamtired.I_____thelivingroomallday.A.paintedB.hadpaintedC.havebeenpaintingD.havepainted6.–Youhaveleftthelighton.--Oh,soIhave._____andturnitoff.A.I’llgoB.I’vegoneC.IgoD.I’mgoing7.ThereportersaidthattheUFO_____easttowestwhenhesawit.A.wastravelingB.traveledC.hadbeentravelingD.wastotravel8.I_____ping-pongquitewell,butIhaven’thadtimetoplaysincethenewyear.A.willplayB.haveplayedC.playedD.play9.–Youhaven’tsaidawordaboutmynewcoat,Brenda.Doyoulikeit?--I’msorryI_____anythingaboutitsooner.Icertainlythinkit’sprettyonyou.A.wasn’tsayingB.don’tsayC.won’tD.didn’tsay10.IwonderwhyJenny_____usrecently.Weshouldhaveheardfromherbynow.A.hasn’twrittenB.doesn’twriteC.won’twriteD.hadn’twrite作文练习同学们在郊游时,看到有些地方水资源的污染情况很严重,对此很有感触。请你根据提示,写一篇关于保护水资源重要性的文章。提示:1水的重要性:在所有吃喝的东西中,水是最重要的。人不能不吃食物活好多天,但却是两三天就会死亡。2某些现象:有些人意识不到水的重要性,长往江河湖泊里扔垃圾;有的工厂往江河湖泊里排废水,造成喝水污染以致无法饮用。3你的感想:谈一点你对保护水资源,保护人类健康的认识。