英语句型转换-肯定句变否定句讲解学习.ppt

英语句型转换-肯定句变否定句判断：肯定句判断：肯定句or否定句否定句1.I am a doctor.2.I am not a doctor.3.He goes to school by bike.4.He does not go to school by bike.(肯肯)(肯肯)(否否)(否否)秘诀秘诀有有be用用be，有情用情，无情无，有情用情，无情无be用助用助启明英启明英语not 何处安放？何处安放？助？助？be？情？情？be动词有三种形式，他们分别是：isamarebe动词 can(可以，能够)will(将要)should(应该)情态动词 助动词do（原形）（原形）does（三单）三单）did(过去式）过去式）否定形式:dont 否定形式:doesnt 否定形式:didnt1)I am a student.2)They are blue.3)It is a dog .1.句子中有句子中有be，在，在be后加后加not。缩写形式：缩写形式：is not=isnt are not=arentam not不能缩写不能缩写I am not a student.They are not blue.It is not a dog.将下列句子改为否定句将下列句子改为否定句:1.It is a tiger.It is not a tiger.2.You are short.You are not short.1)You can pick apples .2)It will rain .3)I should drive .2.句子中有情态动词，在情态动词后加句子中有情态动词，在情态动词后加not。You cannot pick apples.缩写形式：缩写形式：cannot=cant will not=wont should not=shouldnt It will not rain.I should not drive.将下列句子改为否定句将下列句子改为否定句:Lily and Tom will walk to school.Lily and Tom will not walk to school.如果原句子没有be动词也没有情态动词，怎么办？注意：助动词后的动词要打回原形。He doesnt swim every day.I like autumn.I dont like autumn.He swims every day.打回原形打回原形第三人称单数，第三人称单数，主语后主语后+doesnt3.句子中无情无句子中无情无be，用助动词。，用助动词。动词原形，主语后动词原形，主语后+dont1.He has a shirt._2.They help each other._He doesnt have a shirt.They dont help each other.将下列句子改为否定句将下列句子改为否定句:ExerciseNow,you try!1.I get up at 7 oclock._ 2.Mike is good at basketball._ 3.Tom wants a cat._ 4.They will go to the Great Wall._ I dont get up at 7 oclock.Mike is not good at basketball.Tom doesnt want a cat.They will not go to the Great Wall.谢谢观赏By Qiming English此此课课件下件下载载可自行可自行编辑编辑修改，修改，仅仅供参考！供参考！感感谢谢您的支持，我您的支持，我们们努力做得更好！努力做得更好！谢谢谢谢