英语语法之肯定句变否定句.doc

(完整版)英语语法之肯定句变否定句
英语语法之肯定句变否定句
一、肯定句变否定句口诀
给句子分析它，看它结构是哪个
主加be后加not 其他一切全照抄
主加动词主重要
don't doesn’t 来帮忙
don’t doesn't 中间夹
doesn’t doesn't 最特殊第三人称单数全靠它
二、简单句的句子结构
1. 主语+be+其他
2. 主语+动词+其他
备注:其中be里包括（am is are）
判断下列各句是主语加be还是主语加动词
1. I am a girl.
2. I like singing。
3. We go to school every day.
4. They are good friends.
5. He works hard.
6. She likes playing with toys.
7. My mother watches TV every day.
8. You are a beautiful girl.
9. Tom is playing football on the playground。
10. Bill does his homework after supper。
三、肯定句变否定句规则
肯定句
主语+be+其他 变成 主语+be+not+其他
主语+动词+其他 变成 主语+don't+动词+其他
主语（第三人称单数）+动词单三+其他 变成
主语（第三人称单数）+doesn’t +动词原形+其他
练习
1. She is watching TV now。
2. We go to school on Sunday.
3. His father works hard.
4. Jack's mother is a nurse.
5. The cat runs fast。
6. They like reading books.
7. My grandpa gives me a hot dog。
8. Tom often walks to school。
9. I have a doll.
10. It is eating fish.