Unit4SectionAGrammarFocus课件人教版英语八年级下册

Unit4TheWondersofNatureGrammarFocusReadthesentences.Circletheadjectiveswhichcomparethings.Underlinetheadverbswhichcompareactions.Whatisthebiggestdesertintheworld?ItistheSaharaDesert.Howbigisit?Itisabout9,000,000squarekilometresinsize.Whereisthedeepestpointintheocean?ItisintheMarianaTrench.Howdeepisit?Itisabout11,000metresdeep.Somedeep-seaanimalsareblind,buttheycan“see”aswellasothers.MountQomolangmaisoneofthegreatestwondersoftheworld,anditisstillgrowingtaller.TheYangtzeRivertravelsthefarthestinChinaandisabout6,300kilometreslong.4aHowdowecomparethingsoractions?Weuseadjectivestocomparethingsandadverbstocompareactions.规则变化（1）一般情况下，单音节或双音节的形容词/副词比较级＋er，最高级＋est

clever－cleverer－cleverest（2）以

e结尾的词，比较级＋r，最高级＋st

nice－nicer－nicest（3）以辅音字母＋y结尾的词，变

y

为

i，＋er/est

easy－easier－easiest（4）以一个辅音字母结尾的重读闭音节词，双写该辅音字母＋er/est

fat－fatter－fattest（5）多音节和部分双音节的词需要在原级前＋more构成比较级，或＋themost构成最高级

careful－morecareful－themostcareful

beautiful－morebeautiful－themostbeautiful

比较级、最高级的构成不规则变化比较级、最高级的构成原级比较级最高级good/wellbetterbestmany/muchmoremostbad/badlyworseworstlittle(少)lessleastoldolder(新旧或年龄)oldestelder(兄弟姐妹长幼关系)eldestfarfarther(表示距离"更远")farthestfurther(表示程度"更进一步")furthestTheusageofcomparatives

形容词或副词的比较级+thaneg:TheYangtzeRiverislongerthantheYellowRiver.

“比较级+and+比较级”或“moreandmore+原级”表示“越来越……”eg:Summeriscoming.It'sgettinghotterandhotter.

“the+比较级...，the+比较级...”表示“越……,就越……”eg:Themoreyouread,themoreyouknow.Theusageofcomparatives

A+谓语动词+the+比较级+ofthetwo(+名词复数)

表示“两者中较…的那个”eg:Mikeisthetallerofthetwoboys.

Which/Who+谓语动词+比较级,AorB?

表示“A和B哪个/谁更……?”eg:Whichcityislarger,BeijingorShanghai?

A+be+倍数+形容词比较级+than+B

表示“A是B的…倍…”

eg:Ourschoolisthreetimesbiggerthanyours.Theusageofcomparatives(比较级表示最高级)

主语+谓语动词+比较级+thananyother+单数名词+范围.eg:TheYangtzeislongerthananyotherriverinChina.

主语+谓语动词+比较级+thantheother+复数名词+范围.eg:QomolangmaishigherthantheothermountainsinAsia.◆“数词

+

times

+比较级

+than”表示“……是……的几倍”

=倍数+as+原级

+as…

eg:TheNileistwotimeslongerthanthisriver.TheNileisthreetimesaslongasthisriver.强调比较级的比较程度或语气时，形容词比较级前面可以由much,even,far,alittle,abit,alot等来修饰。Theusageofsuperlatives

(the+)最高级(+名词)+in/of/among短语,意为“……中最……的”

eg:Ithinkspringisthebesttimeofayear.

oneofthe+形容词最高级+可数名词复数

+in/of短语

“······中最······的······之一”eg:Hangzhouisoneofthemostbeautifulcities

intheworld.

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……”eg:Asweallknow,theYellowRiveristhesecondlongestriverinChina.

“Which/Who...(the+)最高级,A,BorC?”意为“哪个/谁是最....,A,B还是C?”

eg:Whosingsbestinyourclass,Lily,TomorJack?in

+范围of

+同类特定群体among

+同类事物/人Doyoustillrememberhowtoreadthesenumbers?Whatisthebiggestdesertintheworld?ItistheSaharaDesert.Howbigisit?Itisabout9,000,000squarekilometresinsize.Whereisthedeepestpointintheocean?ItisintheMarianaTrench.Howdeepisit?Itisabout11,000metresdeep.Somedeep-seaanimalsareblind,buttheycan“see”aswellasothers.MountQomolangmaisoneofthegreatestwondersoftheworld,anditisstillgrowingtaller.TheYangtzeRivertravelsthefarthestinChinaandisabout6,300kilometreslong.4a读作：ninemillion读作：eleventhousand读作：sixthousandandthreehundred注意: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one

hundredmillion。1.MountKilimanjarois______(fivethousand,eighthundredandninety-five)

metreshigh.2.______(twenty-fivethousand,sevenhundredandsixty-eight)cubicmetresofwaterpoursdownIngaFallseachsecond.3.TheEastAfricanRiftValleyisabout4,000(_______________)mileslong.4.TheTaklimakanDeserthasatotalareaofabout337,000

(__________________________________)squarekilometres.5,89525,768fourthousandthreehundredandthirty-seventhousandWriteorspelloutthenumbers.4b/ˌkɪlɪmənˈdʒɑːrəʊ//ˈɪŋɡə//ˌtækləˈmɑːkæn//ˈvæli//rɪft/MyfriendsandIvisitedVictoriaFallsinAfricalastyear.Visitingoneoftheworld’s________waterfallswasamagicalexperience.Aswewent________tothefalls,thenoiseofthewaterslowlygrew________andlouder.Then,rightbeforeoureyes,thewaterfallappeared.Itwentonforas________astheeyecouldsee.Later,wesatinaspecialpoolatthetopofthefalls.There,wefeltthewaterrushpastusandbecomeapartofthewaterfall.Itwasthescariestbutalsothe_____________experienceofourtrip!large

amazing

far

close

loudlargestcloserlouderfarmostamazingCompletethepassagewiththecorrectformsofthewordsinthebox.4cHowdoesthewritermakethedescriptionvivid?Tip:Findtheanswerbylookingfor“sensorywords”—wordsthattelluswhatwesee,hear,andfeel.MyfriendsandIvisitedVictoriaFallsinAfricalastyear.Visitingoneoftheworld’s________waterfallswasamagicalexperience.Aswewent________tothefalls,thenoiseofthewaterslo