Unit4TheWondersofNatureSectionAGrammarFocus课件人教版英语八年级下册(1)-1

TheWondersofNature(Period3)SectionA(GrammarFocus)Translatethefollowingsentences.长江是中国最长的河流。它流程最长，长约6300千米。黄河长5464千米，是（中国）第二长河。它长6671千米。TheYangtzeRiveristhelongestriverinChina.Ittravelsthefarthestandisabout6,300kilometreslong.TheYellowRiveris5,464kilometreslongandisthesecondlongest.It’s6,671kilometreslong.cubic milepooladj.立方的n.英里n.池塘；水坑形容词比较级与最高级的变化方式lazy形容词的变化方式，可分为规则变化与不规则变化两种：词尾为辅音+y的形容词，比较级将y改i，再加er,最高级将y改i，再加est1.规则变化lazierlaziestearlyearlierearliest形容词比较级与最高级的变化方式big形容词的变化方式，可分为规则变化与不规则变化两种：短元音+单辅音的单音节形容词，比较级双写词尾加er，最高级双写词尾加est1.规则变化biggerbiggestfatfatterfattestGrammarFocusWhatisthebiggestdesertintheworld?ItistheSaharaDesert.Howbigisit?Itisabout9,000,000squarekilometresinsize.Whereisthedeepestpointintheocean?ItisintheMarianaTrench.Howdeepisit?Itisabout11,000metresdeep.Someblindanimalscan“see”aswellasothers.MountQomolangmaisstillgrowingtaller.TheYangtzeRivertravelsthefarthestinChinaandisabout6,300kilometreslong.Findthecomparativesandsuperlatives.形容词比较级与最高级的变化方式helpful形容词的变化方式，可分为规则变化与不规则变化两种：两个音节以上形容词，比较级前面加more，最高级前面加most1.规则变化morehelpfulmosthelpfulfamousmorefamousmostfamous形容词比较级与最高级的变化方式good/well形容词的变化方式，可分为规则变化与不规则变化两种：原级2.不规则变化betterbest比较级最高级bad/illworseworstmany/muchmoremostlittlelessleastGrammarFocusReadanddiscuss:Whatcanyoufind?Discussinyourgroup.Whatisthebiggestdesertintheworld?ItistheSaharaDesert.Howbigisit?Itisabout9,000,000squarekilometresinsize.Whereisthedeepestpointintheocean?ItisintheMarianaTrench.Howdeepisit?Itisabout11,000metresdeep.Someblindanimalscan“see”aswellasothers.MountQomolangmaisstillgrowingtaller.TheYangtzeRivertravelsthefarthestinChinaandisabout6,300kilometreslong.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。形容词和副词的比较等级特殊的形容词比较级有些形容词有两种不同的比较级和最高级，且代表含义稍有不同：比较级最高级old老，旧older更老的；更旧的elder较年长的；较资深的oldesteldestfar远farther更远的further更进一步的farthestfurthestlate迟；晚later较晚的latter后者的latestlast形容词和副词的比较等级单音节词和部分双音节词多音节词和部分双音节词一般在词尾加-er或-est以e结尾的词加-r或-st以“辅音字母+y”结尾的双音节词，把y变为i再加-er或-est以一个辅音字母结尾的重读闭音节词，双写这个辅音字母后再加-er或-est在单词前加more构成比较级，加most构成最高级fast→faster→fastestnice→nicer→nicesteasy→easier→easiestbig→bigger→biggestbeautiful→morebeautiful→mostbeautiful·规则变化1．形容词和副词的比较级、最高级的构成*“比较级+thananyother+单数可数名词+其他”表示“比其

他任何一个……都……”。该结构可与“the+最高级”相互转换。Qomolangmaishigherthan

anyothermountainintheworld.=Qomolangmaisthehighestmountainintheworld.

珠穆朗玛峰比世界上其他任何山峰都高。(=珠穆朗玛峰是世界上最高的山峰。)*“比较级+and+比较级”表示“越来越……”。①Theearthisgettingwarmerandwarmer.地球变得越来越暖和。②Windblowsupbagshigherandhigherinthesky.风把袋子吹得越来越高。比较级用于两者（人或物）之间，表示“其中一个比另一个更……”或“较……”，基本结构：比较级＋

than。①Chinaismuch

olderthantheUnitedStates.中国比美国古老得多。我们必须比从前更谨慎地工作。②Wemustworkmuch

morecarefullythanwedidbefore.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。形容词和副词的比较级关联情境串考点写出或者用英语拼出这些数字。1.Lastmonth,ourschoolheldabooksale,andmorethan2,000(________________________)studentstookpartintheactivity.2.Wesold36,772(______________________________________________)booksintotalduringthesale.twothousandthirty-sixthousandsevenhundredandseventy-two3.Theactivityraisedfivehundredandtwentythousandfivehundred(____________________)yuanforchildreninpoorareas.4.Wespenttwohundredandthirtythousand(______________________)yuanbuyingnewchairsanddesksfortheschool.520,500230,000*“the+比较级+…,the+比较级+…”

表示“越……，越……”。①

Thebusierheis,the

happierhefeels.他越忙越高兴。②

Thefasteryourun,theharderyoubreathe.你跑得越快，呼吸就越困难。*“数词+times+比较级+than”

表示“……是……的几倍”。Theelephantweighstentimesmorethanthepanda.大象的体重是熊猫的十倍。最高级用于三者或三者以上（人或物）的比较，表示“最……”,基本结构:the+最高级(+of/in)...。①Qomolangmaisthe

highestmountainintheworld.②TheSaharaisthe

biggestdesertintheworld.形容词和副词的最高级③TheCaspianSeaisthe

deepest

ofallthesaltlakes.④TheNileisthe

longestriverintheworld.⑤Chinaisthe

biggestcountryinAsia.⑥TheYangtzeRiveristhe

longestriverinAsia.⑦Sheplaysvolleyball(the)

best

inherclass.Readandguess.are____________________ofalltheanimalsinChina.themostfamousPandasTheyarefatandcute,blackandwhite.TheyonlyliveinChinaandaremorefamousthananyotheranimaltoChinese.Peopleovertheworldlovethemandwe’redoingourbesttolookafterthem.一、用括号内所给单词的正确形式填空。1．Themorefriendsyouhave，the

(happy)youwillfeel.2．Thereareas

(many)studentsinourclassasintheirclass.3．Whocansolvethismathsproblem

(quickly)inourclass?happiermany(the)mostquickly课堂练习4．Iworkthe

(hard)ofallthestudents.Finally，IwroteareportabouttheYellowRiver.Myteachersaid，“Ihopeeverystudentcouldbeas

(excellent)asher!”5．Mysisterusuallydoesherhomeworkalot

(carefully)thanIdo.6．Ourschoolhasmorethanseven

(hundred)students.hardestexcellentmorecarefullyhundred二、根据汉语意思完成句子，每空一词。1．【学科融合】海洋中最深的地方是马里亚纳海沟。The

intheoceanistheMarianaTrench.2．这个公园总面积有500平方米。Thispark

of500squaremetres.deepestpointhasatotalarea3．就我记得的，我们下周要进行一场数学测试。

Iremember，wewillhaveamathstestnextweek.4．实验课上我们不能靠近火源。Wecan't

thefireinthelabclass.5．那座山的山顶终年积雪。Thereissnow

themountainallyearround.AsfarasgoclosetoatthetopofThinkandguess.ItbeginsatChang’an.Thisisanoldtradingroad.

isthe_______tradingrouteintheworld.Themainproductissilk.oldest

TheSilkRoadfriendlysingwellhard-working

popularthintalentedsmartfunnyA:Whoisthefunniestinyourclass?B:…A:Whoisthethinnestinyourclass?B:Ithink…Iwanttoknowyou!Let’splayagame!Writeorspelloutthenumbers.MountKilimanjarois_______(fivethousand,eighthundredandninety-five)metreshigh._______(twenty-fivethousand,sevenhundredandsixty-eight)cubicmetresofwaterpoursdownIngaFallseachsecond.TheEastAfricanRiftValleyisabout4,000(____________)mileslong.TheTaklimakanDeserthasatotalareaofabout337,000(___________________________________)squarekilometres.5,89525,768fourthousandthreehundredandthirty-seventhousandWhyexplorenature?Scientistsdiscover5.