六年级比较级与最高级的用法

课前准备：检查学生掌握单词情况（听写）一、形容词、副词的比较级和最高级的构成规则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）单音节词女口：smallfsmaller—smallestshort—shorter—shortesttall—taller—tallestgreat—greater—greatest（2）双音节词女口：clever—cleverer—cleverestnarrow—narrower—narrowest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；女口：large—larger—largestnice—nicer—nicestable—abler—ablest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，最高级力口-est；女口：easy—easier—easiestheavy—heavier—heaviestbusy—busier—busiesthappy—happier—happiest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；女口：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.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。女口：good—better—bestwell—better—bestbad—worse—worstill—worse—worstoldfolder/elder—oldest/eldestmany/much—more—mostlittle—less—leastfarffurther/fartherffurthest/farthest词形变换。比较级最高级largefasteasywetgoodimportantwellbadmanylittlefarstrongpatientsafeexpensive二、形容词、副词的比较级和最高级的句子公式：比较级形容词物体A+am/are/is+形比+than+物体B.Iamtallerthanyou.Pastaismoredeliciousthanpizza.副词物体A+行为动词+副比+than+物体B.Cheetahsrunfasterthangoats.Hestudiesbetterthanme.最高级1）物体A+am/are/is+the+形最高级+比较范围（of+人/物，in+地方）.Iamthetallestintheclass.Pastaisthemostdeliciousfoodofthethree.2）物体A+行为动词+副词最高级+比较范围（of+人/物，in+地方）.Cheetahsrunfastestintheworld.Hestudiesbestofus.Sheisthan.A.busier/usB.busier/weC.morebusy/usD.morebusy/weJaneisthanBetty.A.lesstallerB.lesstallestC.lesstallD.notastallChinaiscountryintheworld.A.thethirdlargestB.thelargestthirdC.thethirdlargeD.athirdlargest-WhichisseasoninBeijing?-Ithinkit'sautumn.A.goodB.betterC.bestD.thebest5．-Whichis,thesun,themoonortheearth?--Ofcourse,themoonis.A.smallB.smallerC.smallestD.thesmallest6.TheairinBeijingisgettingmuchnowthanafewyearsago.A.cleanB.cleanerC.cleanestD.thecleanest7.Mobilephonesareverypopularnowandtheyarethanbefore.A.cheapB.cheaperC.cheapestD.thecheapest8．IstudyEnglishasasmybrother.A.hardB.harderC.hardest9.Whichis,abicycleoracomputer?A.expensiveB.moreexpensiveC.themostexpensive10.TheYellowRiverisoneofriversinChina.AlongBlongerCthelongest11.Sheisthesecondstudentinourclass.A.tallB.tallerC.tallest用括号里的词的适当形式填空。Tomcanjump(high).Hejumps(high)thantheotherboysinhisclass.Janetsing(well)inherclass.Shecansing(well)thanhermusicteacher,too.Myfatheris(handsome).Butmybrotheris(handsome)thanhim.Heis(handsome)inmyfamily.Ihave(many)booksinmyclass.Butmyteacherhas(many)booksthan(I).(they)houseismuch(old)than(we).三、形容词和副词比较级的用法“A+be+形容词比较级+than+B”意思为“A比B更…如：Thistreeistallerthanthatone.这棵树比那棵树高。在含有连词than的比较级中，前后的比较对象必须是同一范畴，即同类事物之间的比较。在比较级前面使用much，表示程度程度“强得多”。女口：Awatermelonismuchbiggerthananapple.very,quite—般只能修饰原级，不能修饰比较级。“比较级+and+比较级”或“moreandmore+原级”表示“越来越”女口：Itbecomeswarmerandwarmerwhenspringcomes.春天来了，天气变得越来越暖和了。Itisgettingcoolerandcooler.天气越来越凉爽。Thewindbecamemoreandmoreheavily.风变得越来越大。Ourschoolisbecomingmoreandmorebeautiful.我们的学校变得越来越美丽。在含有or的选择疑问句中，如果有两者供选择，前面的形容词要用比较级形式。如：Whoistaller,TimorTom?谁更高，Tim还是Tom?“the+比较级……，the+比较级”，表示“越……越……”。Themoremoneyyoumake,themoreyouspend.钱你赚得越多，花得越多。Thesooner，thebetter.越快越好。表示倍数的比较级用法：.Ais…旧mesthesize/height/length/widthofB.如：Thenewbuildingisthreetimestheheightoftheoldone.这座新楼比那座旧楼高三倍。(新楼是旧楼的四倍高).Ais…旧mesasbig/high/long/wide/largeasB.女口：AsiaisfourtimesaslargeasEurope.亚洲是欧洲的四倍大。（亚洲比欧洲大三倍）.Ais…七］meslarger/higher/longer/widerthanB.女口：Ourschoolistwicebiggerthanyours.我们学校比你们学校大两倍。形容词、副词的最高级形式主要用来表示三者或三者以上人或事物的比较，表示“最"的意思。句子中有表示范围的词或短语。如：ofthethree,inourclass等等。如：Heisthetallestinourclass.他在我们班里是最高的。"否定词语+比较级〃，〃否定词语+so…as"结构表示最高级含义。Nothingissoeasyasthis.=Nothingiseasierthanthis.=Thisistheeasiestthing.比较级与最高级的转换：Mikeisthemostintelligentinhisclass.Mikeismoreintelligentthananyotherstudentinhisclass注意：修饰比较级和最高级的词1）可修饰比较级的词.abit,alittle,rather,much,far,byfar,many,alot,lots,agreatdeal,any,still,even等。.还可以用表示倍数的词或度量名词作修饰语。.以上词（除byfar）外，必须置于比较级形容词或副词的前面。注意：使用最高级要注意将主语包括在比较范围内。（错）Tomisthetallestofhisthreebrothers.（对）Tomisthetallestofthethreebrothers.2）下列词可修饰最高级：byfar,far,much,mostly,almost。Thishatisnearly/almostthebiggest.注意：a.very可修饰最高级，但位置与much不同。Thisistheverybest.Thisismuchthebest.b.序数词通常只修饰最高级。Africaisthesecondlargestcontinent.选择题Thisboxis___thatone.heavythanB.soheavythanC.heavierasD.asheavyasWhenwespeaktopeople,weshouldbe'.aspoliteaspossibleB.aspoliteaspossiblyaspolitelyaspossibleD.aspolitelyaspossiblyThisbookisthatone,butthanthatone.A.asdifficultas;expensiveasmoredifficultas;moreexpensiveasdifficultas;moreexpensivemoredifficultas;asexpensiveIthinkthestoryisnotso___asthatone.A.interestingB.interestedC.moreinterestingD.mostinterestingHisfatherbegantoworkhewassevenyearsold.A.asoldasB.asearlyasC.sinceD.while6.Ithinkscienceis_thanJapanese.A.muchimportantB.importantC.muchmoreimportantD.moremuchimportantThispencilis___thanthatone.A.longestB.longC.longerD.aslongMymotherisno___young.A.shorterB.longerC.littleD.fewThesechildrenarethisyearthantheywerelastyear.A.moretallB.moretallerC.verytallerD.muchtaller10.Itwasveryhotyesterday,butitis___today.A.evenhotterB.morehotterC.muchmorehotD.muchhot四、总结与作业选择填空。Birdscanfly,eaglescanflythanbirds.Theyflyintheworld.(high,higher,highest)Iamthanmybrother,butmylittlesisteristheofus.(fat,fatter,fattest)Whichcanswim,fishorsharks?(well,better,best)Thegreenbookisabook,buttheredoneismuchthanthegreenone.It'sthebookinthebookshop.(nice,nicer,nicest)Lookatthatboy,hei