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句型变化很简单，先把句中动词看。bemaymustwillcan,否定句not加后边。没有现成怎么办?dodoesdid来相伴。一二人称要转变，三单过去要还原。一.直接在动词后加not。1.be动词：am,is,are,was,were后加not.E.g.Iamateacher.→Iamnotateacher.Wearestudents.→Wearenotstudents.Shewasathomeyesterday.→Shewasnotathomeyesterday.2.情态动词：can,may,could,should,will,would,might后加not.E.g.Hecansing.→Hecan’tsing.Youshouldworkhard.→Youshouldn’tworkhard.3.助动词：have,has,had(完成时中)后加not.E.g.Hehasbeenhereforfiveyears.→Hehasnotbeenhereforfiveyears.二.在动词前加don’t,doesn’t,didn’t。1.当句子的时态为一般现在时，主语为第三人称单数时，动词前加doesn’t，再还原为动词原形.其他人称加don’t.e.g.Tomexerciseseveryday.→Tomdoesn’texerciseeveryday.Iloveplayingfootball.→Idon’tloveplayingfootball.2.当句子的时态为一般过去时，变否定句时动词前加didn’t，再还原.e.g.Mikedrewapictureontheblackboard.→Mikedidn’tdrawapictureontheblackboard.IvisitedtheGreatWalllastyear.→Ididn’tvisittheGreatWalllastyear.三.肯定句是祈使句，直接加don’t,切忌在do后直接加not。e.g.Openthebook,please.Don’topenthebook,please.一般疑问句并不难，助情动词放句前。两种回答回答yesno,句首动词人后面。没有现成怎么办？Dodoesdid来相伴。三单过去要还原，问号结尾在后面。一.直接把动词提前：1.be动词：am,is,are,was,were放到句首.E.g.Theyarestudents.→Aretheystudents？Shewasathomeyesterday.→Wassheathomeyesterday?2.情态动词：can,may,could,should,will,would,might放到句首.E.g.Hecansing.→Canhesing?Theywillvisitthemuseumnextweek.→Willtheyvisitthemuseumnextweek?3.助动词：have,has,had(完成时中)放到句首.E.g.Hehasbeenhereforfiveyears.→Hashebeenhereforfiveyears?二.在主语前加do,does,did。1.当句子的时态为一般现在时，主语为第三人称单数时，主语前加does，再还原为动词原形.其他人称加do.e.g.Tomexerciseseveryday.→DoesTomexerciseeveryday?Iloveplayingfootball.→Doyouloveplayingfootball?2.当句子的时态为一般过去时，变一般疑问句时主语前加did，再还原.e.g.Mikedrewapictureontheblackboard.→DidMikedrawapictureontheblackboard？IvisitedtheGreatWalllastyear.→DidyouvisittheGreatWalllastyear?一.将下列句子改为否定句和一般疑问句。1.Heisagoodteacher.He_______agoodteacher.(否定句)_________agoodteacher?(一般疑问句)2.Shehasalreadyfinishedherhomeworknow.She______finishedherhomework____.(否)____shefinishedherhomework____?（疑）.3.Itwillraintomorrow.It________raintomorrow.（否定句）_______raintomorrow?（一般疑问句）4.Ilikeapples.I_________apples.（否定句）________likeapples?（一般疑问句）5.MyfatherwatchesTVeveryevening.Myfather____________TVeveryevening.____yourfather_____TVeveryevening?(疑)6.AnnwenttoLondonlastweek.Ann________toLondonlastweek.（否定）___Ann___toLondonlastweek?(一般疑问)7.Sitdown,please._____sitdown,please.（否定句）8.LiMing’sfathercandrivethecar.LiMing’sfather______drivethecar.（否定）____LiMing’sfatherdrivethecar?(一般疑问)