单击此处编辑母版标题样式单击此处编辑母版文本样式第二级第三级第四级第五级*Unit7Unit7What'sthehighestmountainintheworld?SectionA3Grammarfocus~4cGrammarfocus—What’sthehighestmountainintheworld?—Qomolangma.—HowhighisQomolangma?—It’s8,844.43metershigh.It’shigherthananyothermountain.—Whichisthedeepestsaltlakeintheworld?—TheCaspianSeaisthedeepestofallthesaltlakes.—DidyouknowthatChinaisoneoftheoldestcountriesintheworld?—Yes,Idid.It’smucholderthantheUS.大多数形容词有三个级。1.原级:Structure:as...as...像..….一样e.g.TimisastallasTom.2.比较级(用于两者之间的比较):Structure：形容词比较级＋than...e.g.Thisboxisbiggerthanthatone.形容词和副词的比较级和最高级3.最高级(用于三者或三者以上的比较):Structure:the+形容词的最高级＋of/in...e.g.Tomistheheaviestinourclass.Heisthemostpopularinourschool.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。如:clever—cleverer—cleverestfew—fewer—fewestsmall—smaller—smallest等。形容词、副词的比较级和最高级规则变化和不规则变化2)以e结尾的词，比较级＋r，最高级＋st即可。如：nice—nicer—nicestcute—cuter—cutestlarge—larger—largest3)以辅音字母＋y结尾的变y为i＋er或est如:easy—easier—easiesthappy—happier—happiest再如：early,busy,heavy,dirty,lazy也如此。4)重读闭音节，单辅音结尾的，双写这个辅音字母＋er或est的词：①fat—fatter—fattest②thin—thinner—thinnest③hot—hotter—hottest④red—redder—reddest⑤wet—wetter—wettest⑥big—bigger—biggest5)多音节和部分双音节的词需要在形容词原级前＋more构成比较级，＋themost构成最高级。如：beautiful－morebeautiful－themostbeautiful又如:delicious,popular,important,interesting,expensive,creative双音节的词如:careful－morecareful－themostcarefuluseful－moreuseful－themostuseful少数单音节词也是这样，如：pleased—morepleased—themostpleasedtired—moretired—themosttiredb)不规则变化：good—better—bestwell—better—bestbad—worse—worstmany/much—more—mostfar—farther—farthest(距离远)far—further—furthest(程度深)old—elder—eldest(长幼)old—older—oldest(年龄)三者或三者以上相比，表示最高程度时，用“the+最高级”的结构表示。这种句式一般常有表示比较范围的介词短语。例如：ZhangHuaisthetallestofthethree.Heworks(the)hardestinhisclass.最高级的用法2.最高级可被序数词以及much，byfar，nearly，almost，bynomeans，notquite，notreally，nothinglike等词语所修饰。例如：Thishatisbyfar／much／nearly／almost／notnearly／bynomeans／notquite／nothinglikethebiggest.Howmuchdidthesecondmostexpensivehatcoat?3.表示“最高程度”的形容词，如excellent，extreme，perfect等，没有最高级，也不能用比较级。4.形容词最高级修饰作表语或介词宾语的名词、代词时，被修饰的词往往省略。e.g.Heisthetallest(boy)inhisclass.5.作状语的副词最高级前可以不加定冠词。e.g.Ofalltheboyshecame(the)earliest.比较级考点①比较级修饰问题alittle,abit,even,still,much,alot,far等可修饰比较级。e.g.TomisalittletallerthanJim.Thisbookismuchmoreinterestingthanthatone.中考链接②同级比较e.g.TheweatherinBeijingiscolderthanthatinXi’an.Ourschoolisbiggerthanyours.③the+比较级e.g.Lucyisthefatterofthetwogirls.④“a/an+比较级” 表示“又一，再一”e.g.Lilyhasadoll,butshewants abiggerone.⑤隐性比较（没有than的情况）e.g.Whorunsfaster,LucyorLily?You’dbettercomeearliernexttime.Heworkedhardlastterm,butheworksevenharderthisterm.⑥越来越......比较级+and+比较级b.the+比较级+句子，the+比较级+句子e.g.It’sgettingcolderandcolder.Themoreyouexercise,thebetteryouare.2.最高级考点说明：形容词的最高级前必须加the；副词的最高级前省略the。①范围问题e.g.Tomisthetalleststudentintheclass.Springisthebestseasonoftheyear.②“......之一”问题e.g.Beijingisoneofthebiggestcitiesintheworld.③“the+序数词+最高级”e.g.Ithinkheisthesecondtallestboyinhisclass.3.比较级和最高级的转换e.g.Tomisthetalleststudentintheclass.=Tomistallerthananyotherstudentintheclass.=Tomistallerthanalltheotherstudentsintheclass.=NootherstudentsaretallerthanTom.总结：①anyother+名词单数    theother+名词复数②否定+比较级=最高级    比较级+极限=最高级同级比较①as+adj./adv.+ase.g.SheisasthinasLily.HewritesascarefullyasLinda.②not+as/so+adj./adv.+ase.g.Tonydidn’trunsofastasCarter.1.Ourfamilyhasboughtacarsowecantravel_____thanbefore.（2008陕西）  mosteasily  B.lesseasily  C.easily  D.moreeasily  2.Myfathertoldmeastorylastnight.Itis____oneI’veeverheard.（2009陕西）  thefunniest  B.funniest  C.funnier  D.thefunnier  学以致用DA3.The_____friendsyouhave,the____youwillbe.（2010陕西）        A.more,happy  B.many,happy  C.more,happier  D.many,happier4.Whenheheardacryforhelp,heranoutas_______ashecould.（2011陕西）hardly    B.quickly    C.finally    D.slowlyCB5.ThisplaceisnotbigenoughforLucy’sbirthdayparty.Weshouldfinda_____one.（2012陕西）  big          B.small      C.bigger        D.smallerCFillintheblankswiththecorrectformsofthewordsinthebox.bigmuchpopularlongoldhigh1.TheAmazonRiverisoneofthe_______ riversintheworld.It’salittle_______ thantheYangtzeRiver.2.Qomolangmais8,844.43meters_____. It’soneofthemost________placesfor seriousmountainclimbers.longestlongerhighpopular4a3.Nooceanintheworldisas_____as thePacificOcean.4.AlthoughJapanis_______than Canada,itis_______smaller.bigoldermuch太平洋n.大海；海洋Writetwocomparisonsabouttwotopics.Writetruefacts.Tworivers:_________________and___________________________________________________________________________________________________________________________________________________________________________________________e.g.4bTheYangtzeRiverisalmostaslongastheAmazonRiver.TheAmazonislongerthantheYangtze,buttheYangtzeRiveristhelongestriverinChina.theYangtzeRivertheAmazonRiverTwocities:___________and___________1._______________________________.2._______________________________.Twoanimals:___________and___________1._______________________________.2._______________________________.Writefivequestionsusingcomparisons.Thenaskyourpartneryourquestions.Writing1._________________________________2.___