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形容词和副词比较级的变化规则1．一般单音节词和少数以-er，-ow结尾的双音节词，比较级在后面加-er，最高级在后面加-est；（1）单音节词如：small→smaller→smallestshort→shorter→shortesttall→taller→tallestgreat→greater→greatest（2）双音节词如：clever→cleverer→cleverestnarrow→narrower→narrowest2．以不发音e结尾的单音节词，比较在原级后加-r，最高级在原级后加-st；如：large→larger→largestnice→nicer→nicestable→abler→ablest3．在重读闭音节（即：辅音＋元音＋辅音）中，先双写末尾的辅音字母，比较级加-er，最高级加-est；如：big→bigger→biggesthot→hotter→hottestfat→fatter→fattest4．以“辅音字母＋y”结尾的双音节词，把y改为i，比较级加-er，最高级加-est；如：easy→easier→easiestheavy→heavier→heaviestbusy→busier→busiesthappy→happier→happiest5．其他双音节词和多音节词，比较级在前面加more，最高级在前面加most；如：beautiful→morebeautiful→mostbeautifuldifferent→moredifferent→mostdifferenteasily→moreeasily→mosteasily注意：（1）形容词最高级前通常必须用定冠词the，副词最高级前可不用。例句：TheSaharaisthebiggestdesertintheworld.（2）形容词most前面没有the，不表示最高级的含义，只表示非常。Itisamostimportantproblem.=Itisaveryimportantproblem.6．有少数形容词、副词的比较级和最高级是不规则的，必须熟记。如：good→better→bestwell→better→bestbad→worse→worstill→worse→worstold→older/elder→oldest/eldestmany/much→more→mostlittle→less→leastfar→further/farther→furthest/farthest练习一、语音选出每组单词中划线部分读音与其余三个不同的单词。1.（）A、workerB、workbookC、wormD、doctor2.（）A、weightB、heightC、eightD、eighty3.（）A、thanB、trafficC、lateD、animal4.（）A、nearB、yearC、bearD、hear5.（）A、moreB、workC、worldD、worm二、选择填空。()1.Areyouas_____asyourclassmate,XiaoMing?A.tallB.tallerC.younger()2.______Saturdaymorning,theywentfora_______A.In,walkB.On,walkC.At,walking()3.Thiscatis_____thanthatone.A.thinB.thinnerCthiner()4.Whoserulerislonger,_____?A.yoursorhisB.yourorhisC.yoursorher()5.--Whatdoyourparentsdoaftersupper?--Theytakethe_____dogforawalk.A.cuteB.redC.well()6.--_____yourgrandfather80yearsold?--Yes,he_____.A.Is,doesB.Are,isC.Is,is三、用括号里所给单词的正确形式填空。I’m_____(tall)thanDavid.Who’s_____(young),youoryourbrother?Whichis_____(long),ChangJiangRiverortheYellowRiver?David’sbagis_____(heavy)than_____(I).GaoShanruns______(fast)thanhisbrother.Isyourhairas________(longer,long)ashers?YangLing'fliesakite______(higher\taller)thanDavid’s.四、课文内容填空LastSundaymorning,SuHai_____(go)forawalkinthepark.ShemetBenandhiscousinJack.Theyhada_____(chat).Jackwasnottheonly_____(children).HehadabrotherJimmy.That’sa_____(cute)dog.Jackwas6yearsold.Benwas_____(old)thanhim.Benwasalso_____(tall)and_____(heavy)thanhim.Benwasas_____(old)asSuHai.Buthewas_____(strong)thanSuHai.SuHaihada_____(twins)sisterSuYang.SuYangwastwenty_____(minute)_____(young)thanSuHai.五、完成阅读理解，教师讲评。Mr.WhiteandMrs.Whiteworkinthesamehospital.Theyhavetwolovelygirls.TheirnamesareLucyandLily.LucyandLilyaretwinsisters.Lucyis10yearsold.LilyistenminutesyoungerthanLucy.ButLucyisn’tastallasLily.SheisshorterthanLily.TheyarebothstudentsinSunshinePrimarySchool.LucyisgoodatMath.ButLucyisnot.Sheisbetteratmusic.TheylikewatchingTV.TheywatchTVeverySaturdayandSunday.TheWhitescametoChina2yearsago.TheylikeChinaverymuchnow.TheylikeChinesefood.根据短文内容判断正误。()1.Theparentsworkinthesamehospital.()2.Mr.WhiteandMrs.WhitecametoChina3yearsbefore.()3.LilyisshorterthanLucy.()4.Afterdinner,LucyandLilywatchTV.()5.TheylikeChinesefood.