肯定句变否定句讲稿.ppt
关于肯定句变否定句第一页，讲稿共二十一页哦1.I am a student.I am not a student.2.You are sad.You are not sad.3.She is a good girl.She is not a good girl.4.Yesterday was Monday.Yesterday was not Monday.5.They were busy yesterday.They were not busy yesterday.第二页，讲稿共二十一页哦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。第三页，讲稿共二十一页哦be 动词和not的缩写形式：is not =isntare not =arentwas not =wasntwere not =werent注意：am not 不能缩写。第四页，讲稿共二十一页哦1.He is a boy.He is not a boy.2.I am your friend.I am not your friend.3.My sister is a beatiful girl.My sister is not a beatiful girl.第五页，讲稿共二十一页哦5.There are some books on the bookshelf.There are not any books on the bookshelf.6.I was at home yesterday.I was not at home yesterday.7.They were in Beijing ten years ago.They were not in Beijing ten years ago.第六页，讲稿共二十一页哦注意：句中有some,一般要改为any.第七页，讲稿共二十一页哦1.I can swim.I can not swim.2.You will go to the park.You will not go to the park.3.Peter need go home now.Peter need not go home now 第八页，讲稿共二十一页哦4.You should open your book.You should not open your book.5.He must finish his homework.He must not finish his homework.第九页，讲稿共二十一页哦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。第十页，讲稿共二十一页哦can not =cantmust not =mustntshould not=shouldntneed not =needntwill not =wont第十一页，讲稿共二十一页哦1.Lucy will be back in a week.Lucy wont be back in a week.2.You can use the dictionary.You cant use the dictionary.3.Peter need go home now.Peter neednt go home now.4.You should say“Sorry”.You shouldnt say“Sorry”.5.He must stay at home.He mustnt stay at home.第十二页，讲稿共二十一页哦3.如果句中没有be动词，也没有情态动词，就要借助（dont,doesnt,didnt）来帮忙。第十三页，讲稿共二十一页哦当句中的动词是原形时，在动词前直接加dont。I like English.I dont like English.You have dinner.You dont have dinner.第十四页，讲稿共二十一页哦肯定祈使句变否定祈使句，也是在肯定祈使句变否定祈使句，也是在动词前加直接动词前加直接dont.dont.3.Have some bread,Tom.3.Have some bread,Tom.Dont have any bread,Tom.Dont have any bread,Tom.4.Please open your books.4.Please open your books.Please dont open your books.Please dont open your books.第十五页，讲稿共二十一页哦当句中的动词是第三人称单数时，在动词前加doesnt，动词还原原形。She likes singing.She doesnt like singing.She does her homework.She doesnt do her homework.第十六页，讲稿共二十一页哦 当句中的动词是过去式时,在动词前加didnt，动词还原原形。We had a great time last year.We didnt have a great time last year.I went to school yesterday.I didnt go to school yesterday.第十七页，讲稿共二十一页哦肯定句变否定句肯定句变否定句 练一练练一练 第十八页，讲稿共二十一页哦1.I am your friend._ 2.My mother is a worker._ 3.There are some books on the bookshelf._4.I was at home yesterday._ 5.They were in Beijing ten years ago._6.Lucy will be back in a week.Lucy will be back in a week._第十九页，讲稿共二十一页哦7.She can sing a song and draw a picture._8.Peter need go home tomorrow._10.We come from China._11.He likes the violin._ 12.Peter did lots of work last night._ 第二十页，讲稿共二十一页哦感感谢谢大大家家观观看看第二十一页，讲稿共二十一页哦
