2024新版2026春人教版英语八年级下册教学课件：Unit4 第3课时Section A(Grammar Focus 4a-4d)

Unit4

TheWondersofNature第三课时SectionA(GrammarFocus4a—4d)人教版

八年级英语（下）LeadinLet’senjoysomenaturalwondersoftheworld.Readthesentences.Circletheadjectiveswhichcomparethings.Underlinetheadverbswhichcompareactions.4aGrammarFocusWhatisthebiggestdesertintheworld?ItistheSaharaDesert.Howbigisit?Itisabout9,000,000squarekilometresinsize.Whereisthedeepestpointintheocean?ItisintheMarianaTrench.Howdeepisit?Itisabout11,000metresdeep.Somedeep-seaanimalsareblind,buttheycan“see”aswellasothers.MountQomolangmaisoneofthegreatestwondersoftheworld,anditisstillgrowingtaller.TheYangtzeRivertravelsthefarthestinChinaandisabout6,300kilometreslong.形容词和副词的比较级和最高级比较级(用于两者之间的比较)①形容词比较级＋than...Themorecarefulyouare,thefewermistakesyouwillmake.你越仔细，犯的错误就越少。Heistallerthanme.他比我高。②the+比较级,the+比较级越……，就越……形容词和副词的比较级和最高级比较级(用于两者之间的比较)③比较级+and+比较级

moreandmore+原级越来越……Ourhometownisbecomingmoreandmorebeautiful.我们的家乡变得越来越美丽。Theweatherisgettingcolderandcolder.天气越来越冷了。最高级(用于三者或三者以上的比较)：①the+形容词的最高级＋of/in...Heisthefunniestinhisclass.他是他们班最有趣的。Heisthetallestofthethree.他是这三个人中最高的。形容词和副词的比较级和最高级PingyaoAncientCityisoneofthebest-keptancientcitiesinChina.平遥古城是中国保存最完好的古城之一。②oneofthe+形容词最高级+可数名词复数＋of/in...……中最……的……之一Whosingsthebestinyourclass,Lily,TomorJack?你们班谁唱的最好，莉莉、汤姆还是杰克？③Which/Who...+(the)+最高级,A,BorC?形容词、副词比较级和最高级的变化：clever－cleverer－cleverest

few－fewer－fewest

small－smaller－smallest

规则变化①一般情况下，单音节或双音节的形容词（或副词）比较级＋er

，最高级＋est

nice－nicer－nicest

cute－cuter－cutest

large－larger－largest

②以e结尾的词，比较级＋r，最高级＋steasy－easier－easiest

happy－happier－happiest

③以“辅音字母＋y”结尾的变y为i＋er或estbeautiful－morebeautiful－themostbeautifulcareful－more

careful－themostcareful

useful－moreuseful－themostuseful④多音节和部分双音节词需要在形容词原级前＋more构成比较级，＋themost构成最高级。不规则变化good－better－bestwell－better－bestbad－worse－worst

many,much－more－mostfar－farther－farthest

(距离远)far－further－furthest

(程度深)old－elder－eldest

(长幼)old－older－oldest

(年龄)比较级和最高级的构成比较级+thanthe+比较级，the+比较级比较级的用法规则变化、不规则变化形容词和副词的比较级与最高级比较级+and+比较级moreandmore+形容词/副词原级语法知识导图最高级的用法形容词和副词的比较级与最高级(the+)最高级+in/of/among短语oneofthe+形容词最高级+可数名词复数+in/of短语“Which/Who…(+the)+最高级，A,BorC?”语法知识导图用法意义原级as+原级+as表示“……和……一样”LucyisasthinasLily.notas/so+原级+as表示“……不如……”Jerryisnotas/sotallasTom.比较级二者之间比较级+than表示“……比……更……”I’molderthanher.比较级+and+比较级表示“越来越……”Theweatherishotterandhotter.the+比较级,the+比较级表示“越……，越……”Themore,thebetter.用法意义最高级三者及以上the+最高级（+名词）+of/in表示某一范围内“最……的”Aliceisthe

tallestgirlinherclass.oneofthe

+最高级+复数名词+of/in表示某一范围内“最……的……之一”Chinaisoneofthebiggestcountriesintheworld.the+序数词+最高级（+名词）+of/in表示某一范围内“第几……的”TheYellowRiveristhesecondlongestriverinChina.1．—Didyouwatchthe2025SwimmingWorldCup?—Amazing!I’veneverseen________match.A．themostexcitingB．amoreexciting C．amoreexcited D．themostexcitedBExercise2．—WhatshouldIdo,doctor?—Youmusteat________anddo________exercise.A．less;more B．more;less C．much;little D．fewer;moreA3．________youdoyourhomework,________mistakesyouwillmake.A．Themorecareful;theless B．Themorecarefully;thelessC．Themorecareful;thefewer D．Themorecarefully;thefewerD4．—DoesHenryworkas________asNelly?—No,Nellyismuch________thananyoneelseinherclass.A．hardly;harder B．hardly;morehard-workingC．hard;hard-working D．hard;morehard-working11D5．Chineseisoneof________usedlanguagesintheworld.A．widely B．morewidely C．themostwidely D．widerC较大数字的表达与读法大于一千的基数词的表达法1.从数字的右端向左数，每三位数加一个逗号。2.从右向左，第一个逗号处读thousand(千)，第二个逗号处读million(百万)，第三个逗号处读billion(十亿)。3.读的时候通常在hundred后加and，如果百位数为0，则在thousand后加and。4.英语中没有直接表示“万”和“亿”的单位词，而要用thousand和million来表达，如“一万”用“tenthousand”、“一亿”用“onehundredmillion”。2,674→twothousandsixhundredandseventy-four164,213,430→onehundredandsixty-fourmillion,twohundredandthirteenthousand,fourhundredandthirty18,357,089→eighteenmillion,threehundredandfifty-seventhousand,andeighty-nine5,204,000,000→fivebilliontwohundredandfourmillion1．ThepopulationofChinaisabout1,411,750,000.Thatis________.A．onebillion,fourhundredandelevenmillion,sevenhundredandfiftythousandB．onebillion,andfourhundredeleven,sevenhundredandfiftythousandC．onebillion,fourhundredandelevenmillion,andsevenhundredfiftythousandA2．MountQomolangma,withthehighestpeakintheworld,isabout________.A．eightthousandseighthundredsandforty-eightmetresB．eightthousandsandeighthundredsandforty-eightmetresC．eightthousandandeighthundredandforty-eightmetresD．eightthousandeighthundredandforty-eightmetresD3．Howdoyoureadthebignumber6325047?A．sixmillion,threehundredandtwenty-fivethousandandfortysevenB．sixmillion,threehundredandtwenty-fivethousandandforty-sevenC．sixthousand,threehundredandtwenty-fivemillionandforty-sevenD．sixthousand,threehundredandtwenty-fivemillionandfortysevenBWriteorspelloutthenumbers.4b1.MountKilimanjarois________(fivethousand,eighthundred

andninety-five)metreshigh.2.__________(twenty-fivethousand,sevenhundredandsixty-eight)cubicmetresofwaterpoursdownIngaFallseachsecond.5,89525,7683.TheEastAfricanRiftValleyisabout4,000(______________)miles

long.4.TheTaklimakanDeserthasatotalareaofabout337,000(____________________________________)squarekilometres.three

hundred

and

thirty-seven

thousandfour

thousand总面积为……4cCompletethepassagewiththecorrectformsofthewordsinthebox.largeamazingfarcloseloudMyfriendsandIvisitedVictoriaFallsinAfricalastyear.Visitingoneoftheworld’s_________waterfallswasamagicalexperience.

largestAswewent_________tothefalls,thenoiseofthewaterslowlygrewlouderand_________.Then,rightbeforeoureyes,thewaterfallappeared.Itwentonforas_______astheeyecouldsee.Later,wesatinaspecial

pool

atthetopofthefalls.There,wefeltthewaterrushpastusandbecomeapartofthewaterfall.Itwasthescariestbutalsothe______________experienceofourtrip!largeamazingfar