too..to...和not..enough-to..的用法

too…to….;not…enoughto…Step1看图说话利用课本P36页的图画和提示词练说too…todo和not…enoughtodo句子。如：1.Thesnake/dangerous/hold./TheboynotbraveThesnakeistoodangeroustohold.Theboyisnotbraveenoughtoholdit.板书too…todo和not…enoughtodo并让学生明确这两个短语的中文意思是“太…而不能…”。提醒学生观察这两个句子结构中的形容词用什么形式，todo中的do可否变换形式。在准确理解的基础上继续看图说话。2.Thegirl/short/getontheelephant./she/not/tall.3.Theelephant/heavy/carry./Theboy/notstrong.4.Theelephant/fat/gothroughthegate./Thegate/notwide.5.Themonkey/faraway/getthebananas./Thebananas/notnear.6.Thecat/slow/catchthebird./It/cannotrun/fast.Step2抛砖引玉板书Thesnakeistoodangeroustohold.Theboyisnotbraveenoughtoholdit.(改为同义句)Thesnakeissodangerousthattheboy_________holdit.学生在理解的基础上探求答案，在探求答案的过程中获得新知。板书so…that+含有can’t/couldn’tdo的否定句等同于too…todo…;not…enoughtodo同步操练：1.Thegirlistooshorttogetontheelephant.(改为同义句)①Thegirl_________________________togetontheelephant.②Thegirl____________thatshe___________getontheelephant.③Theelephantissotall__thatthegirlcan’tgetonit.④Theelephant_________enough______thegirl______geton.⑤Theelephant__________tall______thegirl_______geton.完成句子后求异：①与原句比较后发现：由too…todo…结构转换为not…enoughtodo结构时，要找到句中形容词的反义词。③与④比较后发现：so…that+含有can’t/couldn’tdo的否定句结构的句子，若主从句的主语不一致时，改写为too…todo…或not…enoughtodo…结构时,要在不定式todo前添forsb，若主从句的主语一致，则不须添forsb。如：Heissoyoungthathecan’tgotoschool.(改为同义句)Hetooyoungtogotoschool.Henotoldenoughtogotoschool.观察④、⑤两句可得：在too…todo…或not…enoughtodo…的句子中，若todo的宾语与句子的主语相一致时，须省略it。发散思维：若把句子改为过去时，应该怎么办？1.Thegirlwastooshorttogetontheelephant.(改为同义句)Theelephantwassotall__thatthegirlcouldn’tgetonit.2.Heranveryfast.Hecouldn’tstop.Herantoofasttostop.Heransofastthathecouldn’tstop.(方法是句型转换时要注意时态一致。)Step3链接中考Thepandaissofatthatitcan’tgothroughthehole.(改写为同一意思的句子)Thehole________________________________suchafatpandatogothrough.Theiceonthelakewassothinthatpeoplecouldn’tskateonit.(改写为同一意思的句子)Theiceonthelakewasnot_______enough_______people____________________.Mr.Kingisverybusyatwork.Hecan’ttakeaholiday.(改为同义句)Mr.Kingis______________________takeaholiday.Mygrandfatheristoooldtotravelaround.(改为同义句)Mygrandfatheris_______old_______he________________travelaroundany__________.Step4巩固练习1.Mybrotherwassocleverthathecouldworkouttheproblem.(改为同义句)Mybrother__________________________workouttheproblem.2.Theboxisn’tlightenoughforhimtocarry.(改为同义句)Thebox________________________forhim________carry.3.Heisveryshort.Hecan’treachthebookontheshelf.(合并为一句)Heis________________________reachthebookontheshelf.4.Thewaterwassodirty.Wecan’tdrinkit.(改为同义句)Thewaterwastoo__________________________________.5.Thewaterinthisriverisverydirty.Fishescan’tliveinit.Thewaterinthisriveris____________thatfishes___________init.6.Mybrothergotuplateyesterday.Hewaslateforschool.Mybrothergotup________that