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形容词和副词三个等级：1、原级，即原形2、比较级，表示“更……”3、最高级，表示“最……”什么时候用？规则变化不规则变化比较级词和最高级词的构成：1、规则变化原级比较级最高级long—longer—longestbig—bigger—biggesthigh—higher—highestdeep—deeper—deepest一般在词尾加-er:-est:1、规则变化原级比较级最高级fine—finer—finestlate—later—latestcute—cuter—cutest以e结尾的，加–r或-st:1、规则变化原级比较级最高级big—bigger—biggestthin—thinner—thinnestfat—fatter—fattest双写最后字母，再加–er或-est:1、规则变化原级比较级最高级easy—easier—easiestfunny—funnier—funniestearly—earlier—earliestheavy—heavier—heaviest以“辅音字母+y”结尾的双音节词，改“y”为“i”，再加–er或-est:疑问：shyshyest？（单音节词）1、规则变化原级比较级最高级beautiful—morebeautiful—mostbeautifulinteresting—moreinteresting—mostinterestingpopular—morepopular—mostpopularserious—moreserious—mostserious多音节词前加more或most:2、不规则变化原级比较级最高级good/wellbetterbestbad/badlyworseworstmany/muchmoremostlittlelessleastfarfartherfurtherfarthestfurthestLet’spractice!NewwordssquaremeterdeepdesertQomolangmatheNiletheCaspianSeatheSahara平方；正方形米(=metre)深的沙漠珠穆朗玛峰尼罗河里海撒哈拉沙漠NewwordspopulationAsiafeelfreetourtouristwallamazingancient人口数量亚洲随便（做某事）（名&动）旅行旅行者墙令人惊奇的古老的NewwordsprotectwideasfarasIknowman-madetheYangtzeRivertheYellowRivertheMingDynastytheMingGreatWall保护宽的据我所知人造的长江黄河明朝明长城QomolangmatheNiletheCaspianSeatheSaharaQomolangmaiseightthousandeighthundredandforty-fourpointfourthree(8,844.43)kilometerslong.TheSaharaisaboutninemillionsixthousand(9,600,000)squarekilometersinsize.TheCaspianSeaisonethousandandtwenty-five(1,025)metersdeep.TheNileissixthousandsixhundredandseventy-one(6,671)kilometerslong.1aA:Whatisthehighestmountainintheworld?B:Qomolangma.A:Whatis___________desertintheworld?B:TheSahara.A:Whatis___________saltlakeintheworld?B:TheCaspianSea.A:Whatis___________riverintheworld?B:TheNile.1cthebiggestthedeepestthelongestIt’salotbiggerthanthepopulationoftheUS.修饰比较级：much,even,alot,alittle,abit【拓】alot可用来修饰动作，表示“非常”【例】Shespentalotonclothes.Thanksalot.Shehelpedmealot.2aIt’salotbiggerthanthepopulationoftheUS.thepopulationof…“……的人口数量”表示某地人口数量：Thepopulationof（地）is（数）.=（地）hasapopulationof（数）.问某地人口数量：What’sthepopulationof（地）?表示人口“多”用large或great来修饰；表示人口“少”用small来修饰2a【练】1.（2015·辽宁沈阳）Adogwillloveyoufaithfullyandbringyou___happinessforyears.A.lotsofB.manyC.alittleD.afew2.Thepopulationofyourtown___thanours.A.islargerB.arelargerC.ismoreD.aremore2aChinaisalmostasbigastheUS,anditisthebiggestcountryinAsia.as+形容词/副词原级+as“和……一样”，用于肯定句as/so+形容词/副词原级+as“和……不一样”，用于否定句【练】1.（浙江丽水中考）Steveisn’tas___asKelly.Heoftenmakesmistakesinhiswriting.A.carelessB.tidyC.carefulD.difficult2.（2015·广东广州）Emmalookedafterherpetdog___ofallherfriends.A.carefulB.mostcarefulC.morecarefulD.themostcarefully2aDidyouknowthatChinaisoneoftheoldestcountriesintheworld?that引导的宾语从句表示的内容是真理或自然现象等，那么无论主句是何种时态，从句都要用一般现在时。oneofthe+最高级+名词复数“最……的……之一”作主语时，谓语动词要用单数形式【例】SongJieisoneofthetalleststudentsinourclass.Oneofthegirlsismysister.2c【练】1....