小升初专项：陈述句变否定句

陈述句变否定句陈述句：是用来陈述一件事情或表示一种看法，可分为肯定句和 否定句两种形式。一、变否定句：1. 当谓语动词是be动词,am, is are或者过去时was, were时，直 接在这些词后面加not构成否定形式，即am not, is not二isnt , are not二arent。如果句子里有some，在否定句中要变成any。 and变成or。Eg. She is a beautiful girl.（改为否定句）-She isnt a beautiful girl.There are some students in Sun school.（改为否定句）-There arent any students in Sun school.2. 当句子中谓语动词是助动词will,情态动词can, could, should, must等时，直接在助动词和情态动词后加not变为否定句。注意 will not = wont, can not=cant, must not =mustnt 表示禁 止。如果句子里有some，在否定句中要变成any。and变成or。Eg .My family will go to Beijing and Qingdao next Sunday .（ 改为 否定句）-My family will not go to Beijing or Qingdao next Sunday.They can run very fast.（改为否定句）-They cant run very fast.3. Eg.谓语动词是行为动词而又没有助动词或情态动词时，必须 在谓语动词前加助动词，一般现在时加助动词do ,第三人称 单数加does, 一般过去时加did,再和not构成否定结构。dont, doesnt, didnt后都用动词原形。如果句子里有some，在否定 句中要变成any。and变成or。Eg Tom flies kites in the playground.（改 为否定句）-Tom doesnt fly kites in the playground.We often play football after class.（改为否定句）We dont often play football after class.练习1）Mike is a student at Sun school.（改为否定句）Mike a student at Sun school.2）There are some apple juice in the fridge。（改为否定句）Thereapple juice in the fridge.3）I am happy and excited to hear that good news. （改为否定句）I amhappyexcited to hear that good news.4）She will go swimming next week. （改为否定句）Shego swimming next week.5）My parents can cook meat with potatoes . （改为否定句）My parentscook meat with potatoes.6）You must do your homework now.（改为否定句）You do your home work now.7）Jill has lunch at school every day.（改为否定句）Jilllunch at school every day.8）The children had a good time at the party.（改为否定句）The childrena good time at the party.9）Rose didnt watch TV this morning.（改为肯定句）Rosethis morning.10）She does exercises at home in the evening.（改成否定句、Sheexercises at home in the evening.11）He said something important at the meeting.（改为否定句）Heimportant at the meeting.12）He reads English every morning.HeEnglish every morning.13）They can swim across the river.Theyswim across the river.14）I have some bread to eat.Ibread to eat.15）They are playing basketball.Theybasketball.16）The teachers will go to a meeting tomorrow.The teachersgo to a meeting tomorrow.