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=isnt , are not=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）There _ _ _ apple juice in the fridge.3) I am happy and excited to hear that good news. （改为否定句）I am _ _ happy _ excited to hear that good news.4) She will go swimming next week. （改为否定句）She _ _ go swimming next week.5) My parents can cook meat with potatoes . （改为否定句）My parents _ _ cook 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) Jill _ _ lunch at school every day. 8) The children had a good time at the party. (改为否定句) The children _ _ a good time at the party. 9) Rose didnt watch TV this morning.（改为肯定句) Rose _ _ this morning. 10) She does exercises at home in the evening.（改成否定句、）She _ _ exercises at home in the evening.11) He said something important at the meeting.（改为否定句）He _ _ _ important at the meeting.12) He reads English every morning. He _ _ English every morning.13) They can swim across the river. They _ _ swim across the river.14) I have some bread to eat. I _ _ _ bread to eat.15) They are playing basketball