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1、关于肯定句变否定句现在学习的是第1页，共21页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.现在学习的是第2页，共21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。现在
2、学习的是第3页，共21页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。现在学习的是第4页，共21页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.现在学习的是第5页，共21页5.There are some books on the bookshelf.
3、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.现在学习的是第6页，共21页注意：句中有some,一般要改为any.现在学习的是第7页，共21页1.I can swim.I can not swim.2.You will go to the park.You will not go to the park
4、.3.Peter need go home now.Peter need not go home now 现在学习的是第8页，共21页4.You should open your book.You should not open your book.5.He must finish his homework.He must not finish his homework.现在学习的是第9页，共21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。现在学习的是第10页，共21页can not =cantmust not =mustnt
5、should not=shouldntneed not =needntwill not =wont现在学习的是第11页，共21页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.
6、He mustnt stay at home.现在学习的是第12页，共21页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。现在学习的是第13页，共21页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.现在学习的是第14页，共21页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 bre
7、ad,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 Please dont open your books.books.现在学习的是第15页，共21页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
8、.现在学习的是第16页，共21页 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.现在学习的是第17页，共21页肯定句变否定句肯定句变否定句 练一练练一练 现在学习的是第18页，共21页1.I am your friend._ 2.My mother is a worker._ 3.There are some books on the
9、 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._现在学习的是第19页，共21页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._ 现在学习的是第20页，共21页感谢大家观看感谢大家观看现在学习的是第21页，共21页