肯定句變否定句課件

肯定句變否定句1.Iamastudent.→

Iamnotastudent.2.Youaresad.→

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

5.Theywerebusyyesterday.→

Theywerenotbusyyesterday.1.如果句中有be動詞（is,

am,are,was,were),就在be動詞后面直接加not。be動詞和not的縮寫形式：isnot=isn'tarenot=aren'twasnot=wasn'twerenot=weren't注意：amnot不能縮寫。1.Heisaboy.Heisnotaboy.

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

5.Thereare

somebooksonthebookshelf.Therearenot

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

TheywerenotinBeijingtenyearsago.

注意：句中有some,一般要改為any.1.Icanswim.→

Icannotswim.

2.Youwillgotothepark.→

Youwillnotgotothepark.3.Peterneedgohomenow.Peterneednotgohomenow4.Youshouldopenyourbook.Youshouldnotopenyourbook.

5.Hemustfinishhishomework.Hemustnotfinishhishomework.2.如果句中有（can,may,must,should,need,will等），就在這些單詞后面直接加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“Sorry”.

Youshouldn'tsay“Sorry”.5.Hemuststayathome.

Hemustn'tstayathome.

3.如果句中沒有be動詞，也沒有情態(tài)動詞，就要借助（don’t,doesn’t,didn’t）來幫忙。①當(dāng)句中的動詞是原形時，在動詞前直接加don’t。IlikeEnglish.→

Idon'tlikeEnglish.Youhavedinner.→

Youdon'thavedinner.

肯定祈使句變否定祈使句，也是在動詞前加直接don't.3.Havesomebread,Tom.Don'thaveanybread,Tom.4.Pleaseopenyourbooks.Pleasedon'topenyourbooks.②當(dāng)句中的動詞是第三人稱單數(shù)時，在動詞前加doesn’t，動詞還原原形。Shelikessinging.→Shedoesn’tlikesinging.Shedoesherhomework.→Shedoesn’tdoherhomework.

③當(dāng)句中的動詞是過去式時,在動詞前加didn’t，動詞還原原形。Wehadagreattimelastyear.→Wedidn'thaveagreattimelastyear.Iwenttoschoolyesterday.→Ididn'tgotoschoolyesterday.肯定句變否定句練一練

1.Iamyourfriend._____________________________2.Mymotherisaworker._____________________________3.Therearesomebooksonthebookshelf._____________________4.Iwasathomeyesterday._____________________________5.TheywereinBeijingtenyearsago._________________________6.Lucywillbebackinaweek.

______________________7.Shecansingasonganddrawapicture._____________________________8.Peterneedgohometomorrow._____________________________10.WecomefromChina._______