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1形容词的比较级和最高级一．形容词的比较级和最高级的用法在英语中，在表示两者作比较时，形容词要用特别的形式，称为“比较级”，三者及三者以上作比较时用“最高级”，原来的形容词称为“原级”。e.g.Youlooktallerthanme.你比我高。Youareheavierthanme.你比我重。Iamthestrongestinmyclass.我是我们班最强壮的。二.形容词比较级和最高级句型结构1.比较级句型：主语A+be动词+形容词比较级+than+BA……比B……e.g.Heisolderthanme.他比我年长。【拓展】比较级的其他表达方式①the+形容词比较级+ofthetwo+……表示...是两者中较…的。e.g.Heistheheavierofthetwoboys.Lookatthetwoboys.Mybrotheristhetallerofthetwo.②比较级+and+比较级表示越来越……。e.g.Heisgettingtallerandtaller.他越来越高。③the+比较级，the+比较级表示越……越……。e.g.Themorecarefulyouare，thefewermistakesyou'llmake你越细心，就会越少犯错误。hemorewegettogether,thehappierwewillbe.我们聚得越多，我们就越开心Theharderyouwork,thebetteryou'llbe.你越努力工作，你就会变得越好。辅助练习：1.Jimis_______thanalltheothers.(tall)2.Thingsaregetting_______and_______.(bad)3.Thehigheryouclimb,the_______itwillbe.(cold)2.最高级句型：主语+be动词+the+形容词最高级+介词短语（介词短语：inmyclass,intheroom,inthehall…）e.g.Heisthetallestinourclass.【拓展】最高级的其他形式①主语+be+oneofthe+形容词最高级+复数名词+in/of短语表示……是……中2最……之一e.g.BeijingisoneofthelargestcitiesinChina.②序数词+最高级e.g.HainanIslandisthesecondlargestislandinChina.辅助练习：1.Thechangjiangriveris____________________(long)riverinChina.2.TheYellowRiver(HuangHe)is________________（第二长）riverinChina3.A.形容词的比较级和最高级变化规则B.部分双音节与多音节的词比较级在原级之前加more,最高级在原级之前加mostbeautiful---morebeautiful---mostbeautifulinteresting---moreinteresting–mostinterestingdifficult---moredifficult–mostdifficultC.不规则变化的形容词:little/few-less–leastgood–better-best构成原级比较级最高级单音节和少数双音节单词一般词尾加-er,-esttalllongoldsmalltallerlongeroldersmallertallestlongestoldestsmallest以字母e结尾的形容词或副词,直接加-r,-stnicefinelargenicerfinerlargernicestfinestlargest以重读闭音节结尾的形容词或副词,如末尾只有一个辅音字母,双写该字母,再加-er,-estbighotfatthinbiggerhotterfatterthinnerbiggesthottestfattestthinnest以“辅音字母+y”结尾的形容词或副词，把y变为i，再加-er,-estheavybusyearlyeasyheavierbusierearliereasierheaviestbusiestearliesteasiest3bad/ill-worse–worstfar--farther/further—farthest/furthestmany/much–more–moste.g.比较一下下列句子，领悟原级、比较级、最高级的用法。Tomistall.他很高。TomisastallasJohn.汤姆和吉姆一样高。BobistallerthanJohn.鲍勃比约翰高。Johnisthetallestofthethree.约翰是三个当中最高的一个。Johnisthetallestinhisclass.约翰在他们班最高。【课外拓展】1.在比较等级中常用much,alot,far,even等常修饰比较级，表程度。e.g.姚明比我高多了。YaoMingisverytallerthanI.（误）YaoMingismuchtallerthanI.（正）2.在比较等级的句型中，比较的双方必须是同类事物，否则会引起歧义。即人与人，物与物的比较。e.g.他的尺子比我的长。Hisrulerislongerthanme.（误）Hisrulerislongerthanmine.（正）3.形容词最高级前一般有定冠词，但如果前边也有物主代词，名词所有格等词来修饰时，定冠词the常被省略。e.g.加里是我最好的朋友。Garyismythebestfriend.（误）Garyismybestfriend.（正）4.形容词比较级前一般不加定冠词，但句中有“ofthetwo”结构表示“两者中较…的一个”时，定冠词the要加上。e.g.苏珊是这两个女孩子当中较胖的一个。Susanisfatterofthetwogirls.（误）Susanisthefatterofthetwogirls.（正）同步练习：一、选择题。1.Sheis________than________.4A.busier/usB.busier/weC.morebusy/usD.morebusy/we2.Janeis________thanBetty.A.lesstallerB.lesstallestC.lesstallD.notastall3.Chinais________countryintheworld.A.thethirdlargestB.thelargestthirdC.thethirdlargeD.athirdlargest4.-Whichis____seasoninBeijing?-Ithinkit'sautumn.A.goodB.betterC.bestD.thebest5．-Whichis__________,thesun,themoonortheearth?--Ofcourse,themoonis.A.smallB.smallerC.smallestD.thesmallest6.TheairinBeijingisgettingmuch_____nowthanafewyearsago.A.cleanB.cleanerC.cleanestD.thecleanest7.Mobilephonesareverypopularnowandtheyare_____thanbefore.A.cheapB.cheaperC.cheapestD.thecheapes8．IstudyEnglishas_______asmybrother.A.hardB.harderC.hardestD.thehardest9.Whichis_____,abicycleoracomputer?A.expensiveB.moreexpensiveC.themostexpensiveD.expensiver10.TheYellowRiverisoneof______riversinChina.A.longB.longerC.thelongestD.longest二、写出下列单词的比较级和最高级。1.nice_________________________2.fat______________________________3.slow_________________________4.dry_________________________________5.happy________________________6.wet_________________________________7.much__________________________8.ill________________________________59.little__________________________10.bad_____________________________三.根据句意，用所括号内所级形容词的正确形式填空。1.Mr.Smithis____________maninthisoffice.(rich)2.Winteris_____________seasonoftheyears.(cold)4.Itismuch_________todaythanyesterday.(hot)5.Sheisalittle________thanherclassmates.(careful)6.Bobis_________(young)thanFred.but_________(tall)thanFred.7.Almostallthestudents'facesarethesame,butLiDeminglooks_______(fat)thanbeforeafterthesummerholidays.8.Whichis_________(heavy),aduckorachicken?9.Anorangeiaalittle______(big)thananapple,butmuch________(small)thanawatermelon.10.--How_________(tall)isSally?--She's1.55metres________(tall).WhataboutXiaoling?--She'sonly1.40metres________(tal)l)Sheismuch_______(short)thanSally.2)Sheisalsothe_______(short)girlintheclass.四、课堂总结：和学生一起，对本次课的主要内容作总结概括，并用红笔留痕。五．课外作业布置：（）1.Kenis_______thanAnn.A.tallB.tellerC.taller（）2.Whoisthe_______?A.oldestB.olderC.old（）3.How_____isKen?A.manyB.muchC.heavy（）4.I’m147________tall.A.kilogramsB.centimetersC.meters（）5.Thebookis____ofthetwo.6A.thinnerB.thethinnerC.morethinner（）6.Whichdoyoulike_____,coffee,teaormilk?A.theworstB.worseC.theworse(）7.Jimis40kg.Tomis38kg.Tomis_______thanJim.A.tallerB.thinnerC.heavier(）8.Tomis120cm.Jackis__________.Thanhim.A.tallB.tallerC.heavier()9.Mysisterisgoodatsports,Shecanjump____thanme.A.highestB.toohighC.muchhigher一．写出以下各形容词的比较级和最高级：1.t