语法专题之肯定句变否定句（课件）-2025-2026学年人教PEP版（2012）英语六年级下册

肯定句有哪些？ I can pack my schoolbag by myself. I like reading fairy tales. The kitten’s tail is fluffy. A pencil is a tool for writing. Helping classmates is a happy thing. 否定句有哪些？ I am not late for school. I can not ride a bike. I don’t like rainy days. No students are in the playground. There is no milk in the cup. 肯定句和否定句的区别 句子类型 结构特点 关键词 例句 肯定句 主语 + 动词 /be 动词 / 情态动词 + 其他 （无需额外辅助词） 无否定词 1. I am happy. 我很开心。 2. She can sing. 她会唱歌。 3. We like dogs. 我们喜欢小狗。 否定句 1. 含 be 动词： 主语 + be + not + 其他 2. 含情态动词： 主语 + 情态动词 + not + 其他 3. 含实义动词： 主语 + don’t/doesn’t + 动词原形 + 其他 not、don’t、doesn’t 1. I am not happy. 我不开心。 2. She can not sing. 她不会唱歌。 3. We don’t like dogs. 我们不喜欢小狗。 肯定句怎么 转换成否定句？ 直接在 be 动词后面加 not 句子里有 be 动词（am, is, are） 1 I am a student. I am not a student. The cat is black. The cat is not black. 直接在 情态动词后面加 not 句子里有情态动词（can, should, will） 2 I can swim. I can not swim. You should eat vegetables. You should not eat vegetables. ① 看主语（he/she/it/ 单数名词）加 doesn’t， 其他主语（I/you/we/they/ 复数名词）加 don’t ② 原来的动词要变回原形 句子里只有实义动词（跑、跳、喜欢、吃等） 3 I like dogs. I don’t like dogs. She likes cats. She doesn’t like cats. 肯定句转换成否定句 的常见易错点 实义动词否定时，忘记还原动词原形 1 错误案例： She doesn’t likes apples. 正确形式： She doesn’t like apples. 肯定句：She likes apples. 混淆 don’t 和 doesn’t 的用法 2 错误案例： He don’t play football. 正确形式： He doesn’t play football. 肯定句：He plays football. be 动词 / 情态动词否定时，位置放错 3 错误案例： I am happy not. 正确形式： I am not happy. 肯定句：I am happy. 句子里有 some 时，忘记换成 any 4 错误案例： There is not some milk in the cup. 正确形式： There is not any milk in the cup. 肯定句：There is some milk in the cup. 漏加否定词，或重复加否定词 5 肯定句： We play basketball. 错误否定句 We play basketball not. / We play basketball. 只改动词，忘记加 not/don’t/doesn’t 肯定句： He reads books. 错误否定句 He doesn’t not read books. 同时加 doesn’t 和 not，造成重复否定。 肯定句转换成否定句 基础练习题 肯定句变否定句的基础练习题 1. 肯定句：I am a teacher. 否定句：______________________________ 2. 肯定句：The bird is in the tree. 否定句：______________________________ 3. 肯定句：：This is my pencil. 否定句：______________________________ 一、含 be 动词（am/is/are）的句子 I am not a teacher. The bird is not in the tree. This is not my pencil. 肯定句变否定句的基础练习题 1. 肯定句：I can ride a bike. 否定句：______________________________ 2. 肯定句：You should clean your room. 否定句：______________________________ 3. 肯定句：He will go to the park. 否定句：______________________________ 二、含情态动词（can/should/will）的句子 I can not ride a bike. You should not clean your room. He will not go to the park. 肯定句变否定句的基础练习题 1. 肯定句：I like bananas. 否定句：______________________________ 2. 肯定句：She watches TV every day. 否定句：______________________________ 3. 肯定句：We play football after school. 否定句：______________________________ 三、含实义动词的句子 I don’t like bananas. She doesn’t watch TV every day. We don’t play football after school. Can you swim? not don’t doesn’t No, I can’t swim. Do you like ice cream? not don’t doesn’t I don’t like ice cream Is this your pen? not isn’t are’t No, it isn’t. I watch TV every day. 用 don’t I don’t watch TV every day. My mother cooks noodles. 用 doesn’t My mother doesn’t cook noodles. This is a dog. 用 isn’t This isn’t a dog. They are my classmates. 用 aren’t They aren’t my classmates. The bird flies in the sky. 用 doesn’t The bird doesn’t fly in the sky. 先把每道题的肯定句改成正确的否定句， 或否定句改成正确的肯定句 改对一句， 就能画出对应的图案， 全部完成就能收获一幅彩色小画啦！ 游戏规则 I like apples. The cat isn’t black. The cat isn’t orange. The cat is orange. This isn’t a white flower. This is a white flower. He has a pen. He doesn’t have a pen. They aren’t students. They are students. 恭喜通关 $