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Unit7What’sthehighestmountainintheworld?形容词和副词的比较级和最高级规则变化不规则变化形容词、副词的比较级和最高级变化规则good—better—bestwell—better—bestbad—worse—worstmany/much—more—most形容词和副词的比较级和最高级的规则变化比较级最高级一般在词尾加以不发音e结尾的词以“辅音字母+y”结尾的以重读闭音节结尾的多音节词和部分双音节词+er+r变y为i，+er双写最后一个辅音字母+er+est+st变y为i，+est双写最后一个辅音字母+est在单词前加more在单词前加themost(副词可以不加)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—cleverestfew—fewer—fewestsmall—smaller—smallest2)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esteasy—easier—easiesthappy—happier—happiestearly,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。fat—fatter—fattestthin—thinner—thinnesthot—hotter—hottestred—redder—reddestbig—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。多音节的词:beautiful－morebeautiful－themostbeautifuldelicious,popular,important,interesting,expensive,creative.....双音节的词:careful－morecareful－themostcarefuluseful－moreuseful－themostuseful1.原形考点①同级比较两个比较对象程度相同时，用“as+形容词（副词）原形+as”。e.g.Tomisastallashisbrother.②比较对象中一方不及另外一方时，用“notas/so+形容词（副词）原形+as”或“less+形容词（副词）原形than”e.g.Tomisnotastallashisbrother.=Tomislesstallthanhisbrother.2.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.②比较级+thane.g.TheweatherinBeijingiscolderthanthatinXi’an.③the+比较级oftwo+Cn复e.g.Lucyisthefatterofthetwogirls.④“a/an+比较级”表示“又一，再一”e.g.Lilyhasadoll,butshewantsabiggerone.⑤隐性比较（没有than的情况）e.g.Whorunsfaster,LucyorLily?⑥越来越......比较级+and+比较级越...越....the+比较级+句子，the+比较级+句子e.g.It’sgettingcolderandcolder.Themoreyouexercise,thebetteryouare.3.最高级考点①the+最高级in/of/among+范围e.g.WangLinisthetallestinourclass.②表示“最……之一”的句式oneofthe+形容词最高级+复数名词e.g.JingjiangHotelisoneofthebiggesthotelsinourcity.③当最高级前面有物主代词或名词所有格时，不加定冠词the。e.g.TomisLucy’sbestfriend.④最高级前可加序数词。the序数词（除了first）+最高级+单数名词e.g.TheYellowRiveristhesecondlongestriverinChina.⑤形容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.Heisthelaziest(student)inourclass.多位基数词读法608389threehundredandeighty-ninesixhundredandeight1）101~999的三位数由“百位数＋and+两位数组成”。如：325—threehundredandtwenty-five635sixhundredandthirty-five多位基数词读法2）三位数以上的数，从个位往前数，每三位数加一个逗号，从后往前数的第一个逗号代表thousand,第二个逗号代表million,第三个逗号是billion，注意这几个词不能用复数形式，后也不能加and。2,648twothousand,sixhundredandforty-eight16,250,064sixteenmillion,twohundredandfiftythousand,sixty-four9,600,000ninemillion,sixhundredthousand1,025onethousand,twnty-five6,671sixthousand,sixhundredandseventy-one0.43zeropointfourthreeeightthousand,eighthundredandforty-fourpointfourthree8,844.43确切数目与不确切数目的表达：hundred,thousand,million,billion等前面有基数词，表示确切数目时，用单数，后直接接复数名词；如：threehundredbooksonehundredpeoplefivethousandstudentssevenmillionstarts表示不确切数目时，这类词后加-s且与of连用。前面不可以出现确切的数字。如：hundredsofpeoplethousandsofstudentsmillionsofbirdsbillionsoflionsFillintheblankswiththecorrectformsofthewordsinthebox.bigmuchpopularlongoldhigh1.TheAmazonRiverisoneofthe_______riversintheworld.It’salittle_______thantheYangtzeRiver.2.Qomolangmais8,844.43meters_____.It’soneofthemost________placesforseriousmountainclimbers.longestlongerhighpopular4a基数词+度量单位+adj(long/wide/deep/high等)有......长（宽，深，高……）”度量单位：meter米kilometer千米foot英尺squarekilometer平方千米3.Nooceanintheworldisas_____asthePacificOcean.4.AlthoughJapanis_______thanCanada,itis_______smaller.bigoldermuch太平洋n.大海；海洋Writetwocomparisonsabouttwotopics.Writetruefacts.Tworivers:_________________and___________________________________________________________________________________________________________________________________________________________________________________________4bTheYangtzeRiverisalmostaslongastheAmazonRiver.TheAmazonislongerthantheYangtze,buttheYangtzeRiveristhelongestriverinChina.theYangtzeRivertheAmazonRiverTwocities:___________and___________1._______________________________.2._______________________________.Twoanimals:___________and___________1._______________________________.2._______________________________.1.Ourfamilyhasboughtacarsowecantravel_____thanbefore.（2008陕西）A.mosteasilyB.lesseasilyC.easilyD.moreeasily2.Myfathertoldmeastorylastnight.Itis____oneI’veeverheard.（2009陕西）A.thefunniestB.funniestC.funnierD.thefunnierDA3.The_____friendsyouhave,the____youwillbe.（2010陕西）A.more,happyB.many,happyC.more,happierD.many,happier4.Whenheheardacryforhelp,heranoutas_______ashecould.（2011陕西）A.hardlyB.quicklyC.finallyD.slowlyCB5.ThisplaceisnotbigenoughforLucy’sbirthdayparty.Weshouldfinda_____one.（2012陕西）A.bigB.smallC.biggerD.smallerCGrammarFocusWhat'sthehighestmountainintheworld?Qomolangma.HowhighisQomolangma?It's8,844.43metershigh.It'shigherthananyothermountain.Whichisthedeepestsaltlakeintheworld?TheCaspianSeaisthedeepestofallthesaltlakes.DidyouknowthatChinaisoneoftheoldestcountriesintheworld?Yes,Idid.It'smucholderthantheUS.