Unit4TheWondersofNatureSectionAGrammarFocus课件人教版八年级英语下册

SectionA(GrammarFocus)TheWondersofNature1.reviewtheusageofthecomparativesandsuperlatives.2.mastertherulesabouthowtoreadlargenumbersinEnglish.3.talkaboutmorenaturalwondersandplacesusingthetargetlanguage.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,farthestnum.＋单位词＋adj.=num.＋单位词＋prep.＋n.deep=high=wide=long=big=indepthinheightinwidthinlengthinsize形容词和副词的比较等级Let’slearn英语中的形容词和副词常用三种形式来表达事物的等级差别，即原级、比较级和最高级。

原级：没有比较含义；

比较级：两者间比较，表示“较……”或“更……”；

最高级：三者及三者以上比较，表示“最……”，形容词最

高级前一般要加定冠词the，副词最高级前的the可以省略。比较级和最高级的构成规则变化2.以不发音的e结尾加-r，-st。big—_______—_______1.一般在词尾直接加-er，-est。high—______

—______

great—______—_______nice—

______—

______huge—

______—

______higherhighestgreatergreatestnicernicesthugerhugest3.“一辅重闭”作尾巴，双写尾字母，再加-er，-est。biggerbiggest4.以辅音字母加y结尾，改y为i再加-er，-est。heavy—

________—

________heavierheaviest5.双多音节字太长,前加more或most比其它强。beautiful—______________—______________morebeautifulmostbeautiful原级比较级最高级good/wellmany/muchbad/badlylittle(少)oldfar不规则变化betterbestmoremostworseworstlessleastolder/elderoldest/eldestfarther/furtherfarthest/furthest1.thin___________________2.fast____________________ 3.low____________________ 4.deep____________________ 5.easy____________________ 6.late____________________ 7.happy_________________ 8.hot____________________ 9.little____________________ 10.well____________________11.far_______________________________12.amazing_______________________________13.wonderful______________________________lower

lowest

deeper

deepest

easier

easiest

farther/further

farthest/furthest

happier

happiest

hotter

hottest

later

latest

moreamazing

mostamazing

morewonderful

mostwonderful

better

best

less

least

thinner

thinnest

faster

fastest

LookandPractice、1.同级比较

基本结构as...as...

意为“和……一样”。①PeterisastallasTom.一、形容词和副词的原级彼得和汤姆一样高。他和他姐姐/妹妹一样努力工作。②Heworksashardashissister.具体用法比较级的用法1.形容词或副词的比较级+thanTheNileRiverislongerthantheYangtzeRiver.尼罗河比长江长。2.the+比较级+ofthetwo(+名词复数)表示“两者中较……的那个”。

Thisisthelongerofthetworivers.这是两条河流中更长的那条。Thetallerofthetwostudentsismybestfriend.这两个学生中更高的那个是我最好的朋友。3.Which/Who...+比较级,AorB?表示“A和B哪个/谁更……？”Whichiseasier,Chineseormath?语文和数学，哪个更容易？比较级6.A+be+倍数+形容词比较级+than+B表示“A是B的……倍……”。Thisriveristwicelongerthanthatsmallriver.这条河比那条小河长两倍。

Theelephantisfourtimesheavierthanthehorse.大象比马重四倍。

4.“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……”。Shebecomesmoreandmorebeautiful.她越来越漂亮。Itisgettingcolderandcolder.天气变得越来越冷。5.“the+比较级...，the+比较级..”,表示“越……,就越……”。

Theharderyoustudy,thebetteryouwillbe.你学习越努力，就会越优秀。最高级的用法1.(the+)最高级(+名词)+in/of短语，意为“……中最……的”。Thisisthemostbeautifulparkinthecity.这是城市里最美的公园。Heruns(the)fastestinhisclass.他是班里跑得最快的。2.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……”TheYellowRiveristhesecondlongestriverinChina.

黄河是中国第二长河。3.“Which/Who...(the+)最高级，A,BorC?”意为“哪个/谁是最......,A,B还是C？”。Whichisthemostinteresting,Chinese,mathorEnglish?

语文、数学和英语哪个最有趣？

4.oneofthe+形容词最高级+可数名词复数+in/of短语，意为“……中最…的……之一”。

Thisisoneofthemostinterestingbooksinthelibrary.

这是图书馆里最有趣的书之一。Lilyisoneofthemostcarefulgirlsofthethree.Lily是这三个女孩中最细心的一个。【注意】(1)最高级前有物主代词、名词所有格等修饰时，其前不加the。TheYangtzeRiverisChina’slongestriver.(2)当most表示“非常”时，其前不加the。

Itisamostusefulbook.(3)“比较级+thananyother+可数名词单数”=“比较级+thantheother+可数名词复数”表示“比其他任何……都……”,表示最高级含义，可与表示最高级的句子进行转换。Heisthetallestoneinmyclass.=Heistallerthananyothermemberinmyclass.=Myfatheristallerthantheothermembersinmyclass.(4)可用于修饰形容词和副词比较级程度的副词（短语）有:much,alittle,even,alot,abit,far等。Sherunsmuchfasterthanherbrother.她比她弟弟跑得快得多。

LookandPractice用所给词的适当形式填空。1.Thismovieis____________(exciting)thanthatone.2.Itisgetting________and________(warm)asspringcomes.3.The____________(careful)youare,the________(few)mistakesyouwillmake.4.Thisbuildingisthreetimes________(tall)thantheoldone.5.The________(short)ofthetwopencilsisforyou.moreexcitingwarmerwarmermorecarefulfewertallershorter挑战二：写用所给词的适当形式填空。1.(2025扬州中考）TheinternationalinfluenceofYangzhouisgetting___________thanbefore.(strong)2.(2025德阳中考改编）LinTaoruns___________(fast)thanmostofhisclassmates.Heistherunningstarinhisclass.3.(2025达州中考）TheYangtzeRiveristhe__________(long)riverinChina.4.(2025白银中考）Themorewecommunicatewithourparents,the___________(good)we'llunderstandeachother.5.(2025成都中考改编）MissLialwayshasalotofworktodo.Forher,nothingis________________(important)thanaproperplan.6.（宁波中考政编）Formostofthestudents,Juneisalwaysthe___________(busy)monthinayear.7.QianXuesen,fatherofChina'sspaceprogram,isoneofthe___________(great)scientistsintheworld.strongerfasterlongestbettermoreimportantbusiestgreatestCompletethepassagewiththecorrectformsofthewordsinthebox.4clargeamazingfarcloseloudMyfriendsandIvisitedVictoriaFallsinAfricalastyear.Visitingoneoftheworld’s_________waterfallswasamagicalexperience.Aswewent_________tothefalls,thenoiseofthewaterslowlygrewlouderand_________.Then,rightbeforeoureyes,thewaterfallappeared.Itwentonforas_______astheeyecouldsee.Later,wesatinaspecialpoolatthetopofthefalls.There,wefeltthewaterrushpastusandbecomeapartofthewaterfall.Itwasthescariestbutalsothe_______________experienceofourtrip!largestcloserlouderfarmostamazing维多利亚瀑布gocloseto靠近;接近就在眼前；眼皮底下asfarastheeyecan/couldsee极目所尽atthetopof在...的顶部Languagepoints教材

P354c1.Itwentonforasfarastheeyecouldsee.它一眼望不到头。

asfaras...远至(某处)e.g.Therewasafireinthemountain,whichcameupasfarasourvillage.

山里发生了火灾，都蔓延到我们村了。拓展：asfaras...

就.....的限度，到......的程度

asfarasI/weknow据我/我们所知

as/sofarasIcansee依我看e.g.Asfarasweknow,theSaharaisthebiggestdesertintheworld.

据我们所知，撒哈拉沙漠是世界上最大的沙漠。(眉山中考)练习：依我看，这两台电脑没有差别。_____________________,thereisnodifferencebetweenthetwocomputers.

AsfarasIcanseeLet’sthink

试着读出画横线部分的大数字？你能发现什么规律？Howbigisit?Itisabout9,000,000squarekilometresinsize.Howdeepisit?Itisabout11,000metresdeep.TheYangtzeRivertravelsthefarthestinChinaandisabout6,300kilometreslong.读作：ninemillion读作：eleventhousand读作：sixthousandandthreehundredGrammar(二)较大数字的表达与读法大于1000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”。1.

45,390__________________________________________2.

6,425,137__________________________________________3.

13,057,018__________________________________________4.

threemillion,fivehundredthousandandninety-two__________________________________________5.

twenty-eightthousand,sixhundredandfifty-six__________________________________________6.

fortymillion,fourhundredandtwenty-fourthousand__________________________________________写出或读出下列数字。forty-fivethousand,threehundredadnninetysixmillion,fourhundredandtwenty-fivethousand,onehundredandthirty-seventhirteenmillion,fifty-seventhousandandeighteen3,500,09228,65640,424,000Writeorspelloutthenumbers.4b1.MountKilimanjarois________(fivethousand,eighthundredandninety-five)metreshigh.2.__________(twenty-fivethousand,sevenhundredandsixty-eight)cubicmetresofwaterpoursdownIngaFallseachsecond.3.TheEastAfricanRiftValleyisabout4,000(_______________)mileslong.4.TheTaklimakanDeserthasatotalareaofabout337,000(_____________________________________)squarekilometres.5,895three

hundred

and

thirty-seven

thousand25,768four

thousand乞力马扎罗山立方米pourdown倾泻而下英加瀑布东非大裂谷hasatotalareaof...总面积为……Writesomequestionstocompareplaces.Thenaskapartneryourquestions.4dWhat

is

the

highest...?Which

park

is

bigger,

...or...?疑问词（组）+谓语动词+比较级，AorB?

A和B，……更……？A:

WhatisthehighesttowerinChina?B:

It’stheShanghaiTower.A:

Whichparkisbigger,

HydeParkorGreenwichPark?B:

HydePark.A:

What’sthedeepestlakeintheworld?B:

It’sLakeBaikal.A:

Whichriverislonger,

theYangtzeRiverortheNileRiver?B:

TheNileRiver.活动示范Exercises1.Thetownisabout50___________(kilometre)awayfromthecity.2.Therestaurantisas_________(close)asthepostoffice,justnextdoor.3.Thelakeismuch_________(deep)aftertheheavyrain.4.Thatwasthe______________(amazing)paintinginthewholemuseum.5.Itisoneofthebiggest_________(pool)inthiscity.I.用括号中所给单词的适当形式填空。kilometresclosedeepermostamazingpoolsChangingAmazonAccordingtoanewstudy，theAmazonRainforestmaybecomegrasslandinafewyears.TheAmazonRainforestistheworld’s1.____________(big)rainforest.Climatechangeandhuman2.____________(activity)makeit“sick”.Usually，therainforestcanfix3.____________(it).Butnow,itfeelstoo“tired”togetbetter.Thetreesmaydieandtherainforestcoul