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改否定句变化规则：1.观察原句，如果原句有be动词或情态动词或have、has,就在它们后面加not。2.如果句中没有be动词或情态动词或have、has的，就在动词前加don’t或doesn’t或didn’t（动词是原形用don’t;动词是第三人称单数用doesn’t；动词是过去式用didn’t）3.注意：改句时，some要改为any;don’t、doesn’t、didn’t后的动词改为原形。频度副词sometimes,often,usually,always等词要去掉。把下列句子改为否定句。(1)Iamastudent.I______________astudent.(2)Hecanswim.He_________swim.(3)Linglinglikesapples.Lingling____________________apples.(4)Shehasgotsomephotos.She___________________photos.(5)Amyboughtsomepearsyesterday.Amy____________pearsyesterday.amcan’tdoesn’thasn’tgotdidn’tbuyanylikenotany把下列句子改为否定句。(6)Iwanttobeateacher.I______________tobeateacher.don’twant