肯定句变否定句

1.Iamastudent.→

Iamnotastudent.2.Youaresad.→

Youarenotsad.3.Sheisagoodgirl.→Sheisnotagoodgirl.4.YesterdaywasMonday.→YesterdaywasnotMonday.

5.Theywerebusyyesterday.→

Theywerenotbusyyesterday.第一页，共20页。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。第二页，共20页。be动词和not的缩写形式：isnot=isn'tarenot=aren'twasnot=wasn'twerenot=weren't注意：amnot不能缩写。第三页，共20页。1.Heisaboy.Heisnotaboy.

2.Iamyourfriend.Iamnotyourfriend.3.Mysisterisabeatifulgirl.Mysisterisnotabeatifulgirl.

第四页，共20页。5.Thereare

somebooksonthebookshelf.Therearenot

anybooksonthebookshelf.6.Iwasathomeyesterday.Iwasnotathomeyesterday.7.TheywereinBeijingtenyearsago.

TheywerenotinBeijingtenyearsago.

第五页，共20页。注意：句中有some,一般要改为any.第六页，共20页。1.Icanswim.→

Icannotswim.

2.Youwillgotothepark.→

Youwillnotgotothepark.3.Peterneedgohomenow.Peterneednotgohomenow第七页，共20页。4.Youshouldopenyourbook.Youshouldnotopenyourbook.

5.Hemustfinishhishomework.Hemustnotfinishhishomework.第八页，共20页。2.如果句中有（can,may,must,should,need,will等），就在这些单词后面直接加not。第九页，共20页。cannot=can'tmustnot=mustn'tshouldnot=shouldn'tneednot=needn'twillnot=won't第十页，共20页。1.Lucywillbebackinaweek.

Lucywon'tbebackinaweek.2.Youcanusethedictionary.

Youcan'tusethedictionary.3.Peterneedgohomenow.

Peterneedn'tgohomenow.

4.Youshouldsay“Sorry”.

Youshouldn'tsay“Sorry”.5.Hemuststayathome.

Hemustn'tstayathome.

第十一页，共20页。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。第十二页，共20页。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.

第十三页，共20页。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.4.Pleaseopenyourbooks.Pleasedon'topenyourbooks.第十四页，共20页。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.第十五页，共20页。

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.→Ididn'tgotoschoolyesterday.第十六页，共20页。肯定句变否定句练一练

第十七页，共20页。1.Iamyourfriend._____________________________2.Mymotherisaworker._____________________________3.Therearesomebooksonthebookshelf._____________________4.Iwasathomeyesterday._____________________________5.TheywereinBeijingtenyearsago._________________________6.Lucywillbebackinaweek.

______________________第十八页，共20页。7.Shecansingasonganddrawapicture._____________________________8.Peterneedgohometomorrow._____________________________10.WecomefromChina.______________________________11.Helikestheviolin._____________________________12.Peterdidlotsofworklastnight.__________________________

第十九页，共20页。肯定变否定,其实并不难，抓住动词是关键。Be动词，首先看，有它在，not放在它后面。Can,ma