小升初专项：陈述句变否定句

1、.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=aren 。t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 isn t a beautiful girl.there are some students in sun school. 改(为否定句 )

2、-there aren t 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 = won t, can not=can t, must not =mustn 表示禁t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

3、beijing or qingdao next sunday.they can run very fast. (改为否定句 )-they can trun 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 doesn

4、t fly kites in the playground.we often play football after class. (改为否定句 )we don t 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 e

5、xcited 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 yo

6、ur 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 tvthis morning. （改为肯定句 )rose _ _ this morning.10) she does exercises at home in the e

7、vening（.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 basketba