Unit4SectionA4a4d课件人教版八年级英语下册

Let’senjoysomenaturalwondersoftheworld.SectionA4a—4dUnit4TheWondersofNature通过听读例句、分析结构等方式，获取并正确认读形容词和副词比较级、最高级的构成规则（规则变化、不规则变化）及核心用法相关词汇与句式（如bigger,thebiggest,moreamazing等），感知比较级与最高级的语法特征；（学习理解）01通过完成句式填空、改写句子、编写比较类问题等练习，获取比较级与最高级在描述事物特征、动作程度时的关键用法，归纳并内化“比较级+than”“oneofthe+最高级+可数名词复数”等常用表达；（应用实践）02通过讨论、问答互动等活动，理解比较级与最高级在实际交际中描述事物差异、进行对比的意义，能够主动运用该语法结构描述身边的人或事物，并认同准确运用比较句式能让表达更丰富的语言理念。

（迁移创新）03学习目标friendlysingwellhard-working

popularthintalentedsmartfunnyA:Whoisthefunniestinyourclass?B:…A:Whoisthethinnestinyourclass?B:Ithink…Iwanttoknowyou!Let’splayagame!4a

Readthesentences.Circletheadjectiveswhichcomparethings.Underlinetheadverbswhichcompareactions..theYangtzeRiver长江

6300kmtheAmazonRiver亚马逊河6440kmtheNile尼罗河6670kmlonglongerlongestTheAmazonRiverislongerthantheYangtzeRiver.TheNileislongerthantheAmazonRiver.TheNileisthelongestofall.概念理解比较级：_____者比较。最高级：_____者或_____者以上比较。两三三Presentation1.比较级和最高级的基本概念概念：用来修饰名词的形容词或者修饰动词的副词，会因为修饰程度不同而有所“比较”，可分为原级，比较级（更......）与最高级（最......）。Presentation3.比较级的用法形容词或副词的比较级+thanTheChangjiangRiverislongerthanit.长江比它长。Billrunsfasterthananyotherboyinhisclass.比尔跑得比班上其他任何男孩都快。“比较级+and+比较级(单音节词和部分双音节词)”或“moreandmore+原级(多音节词和部分双音节词)”表示“越来越……”。Summeriscoming.It'sgettinghotterandhotter.夏天就要来了。天越来越热了。“the+比较级...，the+比较级..”表示“越……,就越……”。Themoreyouread,themoreyouknow.你阅读得越多,知道的就越多。Presentation3.比较级的用法the+比较级+ofthetwo(+名词复数)

表示“两者中较……的那个”。Mikeisthetallerofthetwoboys.迈克是两个男孩中较高的那个。Which/Who...+比较级,AorB?表示“A和B哪个/谁更……？”Whichcityislarger,BeijingorShanghai?北京和上海，哪个城市更大？A+be+倍数+形容词比较级+than+B

表示“A是B的……倍……”。Ourschoolisthreetimesbiggerthanyours.我们学校是你们学校的三倍大。

Presentation4.最高级的用法(the+)最高级(+名词)+in/of短语，

意为“……中最……的”。Ithinkspringisthebesttimeofayear.我认为春天是一年中最好的时节。Tomworks(the)hardestinClass3.在三班汤姆学习最努力。。oneofthe+形容词最高级+可数名词复数+in/of短语，意为“……中最……的……之一”。Hangzhouisoneofthemostbeautifulcitiesintheworld.

杭州是世界上最美的城市之一。the+序数词+形容词最高级+可数名词单数+in/of短语,意为“在…中是第几……的……”Asweallknow,theYellowRiveristhesecondlongestriverinChina.

众所周知,黄河是中国第二长河。“Which/Who...(the+)最高级，A,BorC?”

意为“哪个/谁是最......,A,B还是C？”。Whosingsbestinyourclass,Lily,TomorJack?你们班谁唱得最好，莉莉，汤姆还是杰克？

Thisismyworstperformance.SheisLucy’sbestfriend.Reminder:如果最高级前有形容词性物主代词或名词所有格等修饰语时则不再用定冠词the。2.最高级的常用结构（1）the+形容词或副词最高级+in/of短语

……中最……的

Tomisthetallestinhisclass.

Tomruns(the)fastestofallthestudents.

Practice（2）序数词与最高级结合

TheYangtzeRiveristhethirdlongestriverintheworld.（3）oneofthe+形容词或副词最高级+名词复数表示“最……之一”

Beijingisoneofthelargestcitiesintheworld.（4）特殊疑问句中的最高级

Whichanimaljumpsthehighest,thelion,themonkey,orthetreefrog?

Whoisthekindestpersoninyourfamily?（5）比较级表达最高级的含义

Juliaistallerthananyothergirlinherclass.

=Juliaisthetallestgirlinherclass.PracticePractice用所给词的适当形式填空1.TheYellowRiveris_________(long)thantheHuaiheRiver.2.MountTaiisthe_________(high)ofthetwomountainsinShandong.3.Theseaisgettingmoreandmore_________(beautiful)withenvironmentalprotection.4.Thislakeisthe_________(deep)inourprovince.5.Whichis_________(long),theAmazonRiverortheNileRiver?6.Thisriveristhreemetres__________(wide)thanthatone.7.HainanIslandisthesecond__________(large)islandinChina.8.Thesunsetovertheoceanisoneofthe_______________(amazing)sceneriesintheworld.longerhigherbeautifuldeepestlongerwiderlargestmostamazing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)PracticePractice1.big___________________2.high____________________ 3.low____________________ 4.deep____________________ 5.easy____________________ 6.far____________________ 7.happy_________________ 8.loud____________________ 9.great____________________ 10.close____________________11.amazing_______________________________12.interesting______________________________13.well____________________ 14.little____________________写出下列单词的比较级和最高级bigger

biggest

higher

highest

lower

lowest

deeper

deepest

easier

easiest

farther

farthest

happier

happiest

louder

loudest

greater

greatest

closer

closest

moreamazing

mostamazing

moreinteresting

mostinteresting

better

best

less

least

Practice1.—Whichis______naturalwonderintheworld,theGrandCanyon,theSaharaDesertortheGreatBarrierReef?—IthinktheGrandCanyonis.A.greatB.greaterC.thegreatestD.moregreat2.TheYangtzeRiverisoneof______riversintheworld.A.longB.longerC.thelongestD.mostlong3.Theforestisbecoming______becausemoretreesareplantedeveryyear.A.greenerandgreenerB.greenandgreenC.moreandmoregreenD.greenest4.Thiswaterfallis______ofthethreeinthisarea.A.themostbeautifulB.morebeautifulC.beautifulerD.beautifulest单项选择CCAACanyousayanumberbiggerthan10?onehundred100twohundredandseventy-eight278fourhundredandfifty-one4517274?Practice较大数字的表达与读法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。大于一千的基数词的表达法Practice4.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→fivebilliontwohundredandfourmillionPracticePractice写出或读出下列数字。

2,674

→______________________________________________164,213,430

→_________________________________________________________________________________18,357,089

→___________________________________________________________________________________twenty-eightthousand,sixhundredandfifty-six___________fortymillion,fourhundredandtwenty-fourthousand_______twothousandsixhundredandseventy-fouronehundredandsixty-fourmillion,twohundredandthirteenthousand,fourhundredandthirtyeighteenmillion,threehundredandfifty-seventhousand,andeighty-nine28,65640,424,0001.MountKilimanjarois________(fivethousand,eighthundredandninety-five)metreshigh.2.__________(twenty-fivethousand,sevenhundredandsixty-eight)cubicmetresofwaterpoursdownIngaFallseachsecond.3.TheEastAfricanRiftValleyisabout4,000(______________)

miles

long.4.TheTaklimakanDeserthasatotalareaofabout337,000(____________________________________)squarekilometres.5,895three

hundred

and

thirty-seven

thousand4bWriteorspelloutthenumbers.25,768four

thousand总面积为……PracticeMyfriendsandIvisitedVictoriaFallsinAfricalastyear.Visitingoneoftheworld’s_________waterfallswasamagicalexperience.Aswewent_________tothefalls,thenoiseofthewaterslowlygrewlouderand_________.Then,rightbeforeoureyes,thewaterfallappeared.Itwentonforas_______astheeyecouldsee.Later,wesatinaspecial

pool

atthetopofthefalls.There,wefeltthewaterrushpastusandbecomeapartofthewaterfall.Itwasthescariestbutalsothe______________experienceofourtrip!

largestmost

amazingcloserlouderfar

极目所尽4c

Completethepassagewiththecorrectformsofthewordsinthebox.large

amazing

far

close

loud4dWritesomequestionstocompareplaces.Thenaskapartneryourquestions.What

is

the

highest...?Which

park

is

bigger,

...or...?Practice1)MountQomolangmais_________thananyothermountainintheworld.2)TheSaharaDesertis_____________desertintheworld.4)TheNileis____________riverintheworld.6)—DidyouknowthatChinaisoneof___________countriesintheworld?—Yes,Idid.It’s______________thanmycountry.higherthebiggestFillintheblanks.thelongesttheoldestmucholderReviewthegrammarafterclass.PracticePresentationthousandmillion1.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.读数时，通常在hundred后加and；若百位数为0，则在thousand后加and。4.英语中无直接表示“万”和“亿”的单位词，需用thousand和million表达，如“一万”是tenthousand、“一亿”是onehundredmillion。较大数字的表达与读法

9，365,278,689billion用所给词的适当形式填空。Exercise1.(2025·扬州中考)TheinternationalinfluenceofYangzhouisgetting________thanbef