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变否定句的方法及习题：一、句中有Be(am,is,are,was,were)动词的时候，直接在Be(am,is,are,was,were)动词后加not,通常缩写。Lg.1.I’macook.-------I’mnotacook.2.TomiswatchingTV.--------Tomisn’twatchingTV.3.Theywerestudentsinaschool10yearsago.-----Theyweren’tstudentsinaschool10yearsago.4.Sheisgoingtostudycomputerscience.-----Sheisn’tgoingtostudycomputerscience.二、句中有情态动词时候，在情态动词（can,may,must,might,will,would,should…）后加not,通常缩写。Lg.1.IwillgotoShanghainextyear.----Iwon’tgotoShanghainextyear..2.Sheshouldcomebackontime.----Sheshouldn’tcomebackontime.三、句中没有Be动词和情态动词的时候，在动词前面加don’t、doesn’t或didn’t，动词用原形。过去时用didn’t;一般现在时,当主语是第三人称单数(He,She,It,或单个的人或物)的时候用doesn’t，其它都用don’t.Lg.1.IwenttoNewYorkCitylastyear.----Ididn’tgotoNewYorkCitylastyear.2.Sheoftenexercises.----Shedoesn’toftenexercise.注意：1.通常some改为any,too改为either;例如：Ihavesomebooks----Idon’thaveanybooks.IcanreadEnglishbooks,too.—Ican’treadEnglishbooks,either.分类练习：一．含有be动词的句子变否定句：1.Theyareplayingbasketballwiththeirteacher.(改为否定句)They________________basketballwiththeirteacher.2.Theywereteachersinthisschool5yearsago.(改为否定句)___________________teachersinthisschool5yearsago.3.Sheisgoingtopracticebasketballeveryday.(改为否定句)She_________________topracticebasketballeveryday.二．含有情态动词的句子变否定句：1.Iwillgotothemovieswithmyclassmates.(改为否定句)I__________________tothemovieswithmyclassmates.2.Shecansingwell.(改为否定句)She_____________________well.3.Everyoneshouldstudyhardfortheirhope.(改为否定句)Everyone_________________hardfortheirhope.三．没有be动词和情态动词的句子变否定句:1.Shedidherhomeworkyesterday.(改为否定句)She_____________________herhomeworkyesterday.2.Lucyhurtherselfinclass.(改为否定句)Lucy________________herselfinclass.3.Shehastogothereonfoot.(改为否定句)She_________________togothereonfoot.综合训练(改为否定句)：1.ShewenttoHainanforvacationlastyear.(改为否定句)She_________________toHainanforvacationlastyear.2.IbroughtsomethingspecialtoTomyesterday.(改为否定句)I__________bring_________specialtoTomyesterday.3.Shegoestoschoolat7:00onweekdays.(改为否定句)She_________________toworkat7:00onweekdays.4.Hedoeshishomeworkat8:00.(改为否定句)He__________________hishomeworkat8:00.5.Wecankeepingoodhealththroughexercise.(改为否定句)We________________keepingoodhealththroughexercise.6.ShesingsmoreclearlythanLucy.(改为否定句)She________________moreclearlythanLucy.7.Myfathercanplaythedrumwell.(改为否定句)Myfather________________thedrumwell.8.SunnyTheaterhastheworstsoundintown.(改为否定句)SunnyTheater_______________theworstsoundintown.9.Icanstandstayinginanoisyroom.(改为否定句)I__________________stayinginanoisyroom.10.TheyaregoingtotheWestLake.(改为否定句)They________________totheWestLake.11.Hecanplaytheviolin,too.(改为否定句)He______playtheviolin,____________.12.Wearegoingtodomoreexercisetokeephealthy.(改为否定句)We_________________todomoreexercisetokeephealthy.13.Peoplewillcutdownmoretreesformoneyin2080.(改为否定句)People______________downmoretreesformoneyin2080.14.Theoldman’slifewillbebetter.(改为否定句)Theoldman’slife________________better.15.Everyoneshouldplayapartinprotectingwildanimals.(改为否定句)Everyone_________________apartinprotectingwildanimals.16.Heneedsonespoonofhoney(改为否定句)He______________onespoonofhoney.17.Ithinkitwilltakemeanhourtofinishit.(改为否定句)I________thinkit_______takemeanhourtofinishit.18.Youshouldcookitforatleasthalfanhour.(改为否定句)You______________itforatleasthalfanhour.19.I’mgoingtohaveapartythisevening.(改为否定句)I’m___________________tohaveapartythisevening.20.Jennyhastohelpherparents.(改为否定句)Jenny__________________tohelpherparents.21.Ithinktheyhadagoodtimeatthepartyyesterday.(改为否定句)I________thinkthey_______agoodtimeatthepartyyesterday.22.TheytraveledtoLijianglastsummer.(改为否定句)They____________________toLijianglastsummer.23.Ithinktherewillbemorewaterpollution.(改为否定句)I_________thinkthere________bemorewaterpollution.24.Weneedtwobananastomakethemilkshake.(改为否定句)We________________twobananastomakethemilkshake.25.Sheisgoingtobuysomeclothesforhermothertomorrow.(改为否定句)She_______goingtobuy_______clothesforhermothertomorrow.26.Shevisitedmuseumslastyear,too.(改为否定句)She_________visitmuseumslastyear,___________.27.Iboughtsomethingspecialformyfather.(改为否定句)I___________buy__________specialformyfather.