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1、肯定句变否定句1.Iamastudent.→Iamnotastudent.2.Youaresad.→Youarenotsad.3.Sheisagoodgirl.→Sheisnotagoodgirl.4.YesterdaywasMonday.→YesterdaywasnotMonday.5.Theywerebusyyesterday.→Theywerenotbusyyesterday.1.如果句中有be动词（is,am,are,was,were),就在be动词后面直接加not。be动词和not的缩写形式：isnot=isn'tarenot=aren'twa
2、snot=wasn'twerenot=weren't注意：amnot不能缩写。1.Heisaboy.Heisnotaboy.2.Iamyourfriend.Iamnotyourfriend.3.Mysisterisabeatifulgirl.Mysisterisnotabeatifulgirl.5.Therearesomebooksonthebookshelf.Therearenotanybooksonthebookshelf.6.Iwasathomeyesterday.Iwasnotathomeyesterday.7.TheywereinBeijing
3、tenyearsago.TheywerenotinBeijingtenyearsago.注意：句中有some,一般要改为any.1.Icanswim.→Icannotswim.2.Youwillgotothepark.→Youwillnotgotothepark.3.Peterneedgohomenow.Peterneednotgohomenow4.Youshouldopenyourbook.Youshouldnotopenyourbook.5.Hemustfinishhishomework.Hemustnotfinishhishomework.2.如果
4、句中有（can,may,must,should,need,will等），就在这些单词后面直接加not。cannot=can'tmustnot=mustn'tshouldnot=shouldn'tneednot=needn'twillnot=won't1.Lucywillbebackinaweek.Lucywon'tbebackinaweek.2.Youcanusethedictionary.Youcan'tusethedictionary.3.Peterneedgohomenow.Peterneedn'tgohomenow.4.Youshouldsay“
5、Sorry”.Youshouldn'tsay“Sorry”.5.Hemuststayathome.Hemustn'tstayathome.3.如果句中没有be动词，也没有情态动词，就要借助（don’t,doesn’t,didn’t）来帮忙。①当句中的动词是原形时，在动词前直接加don’t。IlikeEnglish.→Idon'tlikeEnglish.Youhavedinner.→Youdon'thavedinner.肯定祈使句变否定祈使句，也是在动词前加直接don't.3.Havesomebread,Tom.Don'thaveanybread,Tom.
6、4.Pleaseopenyourbooks.Pleasedon'topenyourbooks.②当句中的动词是第三人称单数时，在动词前加doesn’t，动词还原原形。Shelikessinging.→Shedoesn’tlikesinging.Shedoesherhomework.→Shedoesn’tdoherhomework.③当句中的动词是过去式时,在动词前加didn’t，动词还原原形。Wehadagreattimelastyear.→Wedidn'thaveagreattimelastyear.Iwenttoschoolyesterday.→Id
7、idn'tgotoschoolyesterday.肯定句变否定句练一练1.Iamyourfriend._____________________________2.Mymotherisaworker._____________________________3.Therearesomebooksonthebookshelf._____________________4.Iwasathomeyesterday._____________________________5.TheywereinBeijingtenyearsago.______________
8、___________6.Lucywillbebackinaweek._____
