Unit4SectionA(4a4d)Grammar课件人教版英语八年级下册

SectionA(4a-4d)GrammarTheWondersofNatureUnit4Reviewstructureofsuperlative:Subject+Beverb+the(adj.)est+n.+in/of/amongSubject+do/does+the(adv.)est+in/of/amongadj./adv.比较级＋and＋adj./adv.比较级

越来越...moreandmorebeautifulthe＋adj./adv.比较级

,the＋adj./adv.比较级

越来越...

Theharderyouwork,thebettergradesyouwillget.A比任何一个人/物都...（用比较级表示最高级的意思）A＋V./be＋adj./adv.比较级＋than＋anyother＋单数名词Sheistallerthananyotherstudentinherclass.=Sheisthetalleststudentinherclass.4aReadthesentences.Circlethe

adjectivewhichcomparethings.Underlinetheadverbswhichcompareactions.Whatisthebiggestdesertintheworld?ItistheSaharaDesert.Howbigisit?Itisabout9,000,000squarekilometresinsize.Whereisthedeepestpointintheocean?ItisintheMarianaTrench.Howdeepisit?Itisabout11,000metresdeep.Somedeep-seaanimalsareblind,buttheycan“see”aswellasothers.MountQomolangmaisoneofthegreatestwondersoftheworld,anditisstillgrowingtaller.TheYangtzeRivertravelsthefarthestinChinaandisabout6,300kilometreslong.Adjectives(tocomparethings)Adverbs(tocompareactions)biggest,deepest,greatest,tallerwell,farthestlinkingverbget,become,seem,appear后通常＋adj.比较级num.＋单位词＋adj.=num.＋单位词＋prep.＋n.deep=high=wide=long=big=indepthinheightinwidthinlengthinsizeHighlightthelargenumbersin4a.Whatisthebiggestdesertintheworld?ItistheSaharaDesert.Howbigisit?Itisabout9,000,000squarekilometresinsize.Whereisthedeepestpointintheocean?ItisintheMarianaTrench.Howdeepisit?Itisabout11,000metresdeep.Somedeep-seaanimalsareblind,buttheycan“see”aswellasothers.MountQomolangmaisoneofthegreatestwondersoftheworld,anditisstillgrowingtaller.TheYangtzeRivertravelsthefarthestinChinaandisabout6,300kilometreslong.Doyourememberhowtoreadlargenumbers?billion十亿million百万thousand千point点fivezeroeight1从小数点开始从右到左，每个数加一个“,”依次读作thousand,milloion,billion;2小数点读“point”；3从左到右读数，每隔三位按百位数读；4百位和十位之间加and，若十位为0，and不省略5小数点后面的数只读数字，不读数位。andandandhundredhundredhundredHowtoreadorwritetheselargenumbers?2,6748,848.8618,357,0891,234,567,890twothousand,sixhundredandseventy-foureightthousand,eighthundredandforty-eightpointeightsixeighteenmillion,threehundredfifty-seventhousand,andeighty-nineonebillion,twohundredandthirty-fourmillion,fivehundredandsixty-seventhousand,eighthundredandninetytwenty-eightthousand,sixhundredandfifty-six28,656fortymillion,fourhundredandtwenty-fourthousand40,424,0001.MountKilimanjarois__________(fivethousand,eighthundredandninety-five)metreshigh.2._________(twenty-fivethousand,sevenhundredandsixty-eight)

cubic

metresofwaterpoursdownIngaFallseachsecond.3.TheEastAfricanRiftValleyisabout4,000(_____________)mileslong.4.TheTaklimakanDeserthasatotalareaofabout337,000(____________________________________)squarekilometres.Writeorspelloutthenumbers.5,89525,768threehundredandthirty-seventhousandfourthousand4bm³=1.61km5,895metershigh25,768cubicmeters4,000mileslong337,000squarekilometersHowtoexpressmeasurements?HeightVolumeLengthSizeWhyshouldweaddadjectiveshere?Completethepassagewiththecorrectformsofthewordsinthebox.largeamazingfarcloseloudMyfriendsandIvisitedVictoriaFallsinAfricalastyear.Visitingoneoftheworld's_____________waterfallswasamagicalexperience.Aswewent____________tothefalls,thenoiseofthewaterslowlygrew_________andlouder.Then,rightbeforeoureyes,thewaterfallappeared.Itwentonforas________astheeyecouldsee.Later,wesatinaspecialpoolatthetopofthefalls.There,wefeltthewaterrushpastusandbecomeapartofthewaterfall.Itwasthescariest

butalsothe______________experienceofourtrip!4cadj.adj.adj./adv.adj./adv.adj./adv.Tip:1.keywords2.partofspeechadj.最高级adv.adj.比较级adv.adj.最高级Completethepassagewiththecorrectformsofthewordsinthebox.largeamazingfarcloseloudMyfriendsandIvisitedVictoriaFallsinAfricalastyear.Visitingoneoftheworld's_____________waterfallswasamagicalexperience.Aswewent____________tothefalls,thenoiseofthewaterslowlygrew_________andlouder.Then,rightbeforeoureyes,thewaterfallappeared.Itwentonforas________astheeyecouldsee.Later,wesatinaspecialpoolatthetopofthefalls.There,wefeltthewaterrushpastusandbecomeapartofthewaterfall.Itwasthescariest

butalsothe______________experienceofourtrip!4cadj.adj.adj./adv.adj./adv.adj./adv.largestcloserlouderfarmostamazingWhatthetypeofthetext?It’sadiary.Inwhatorderdoesthewr