1、1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dont doesnt 来帮忙dont doesnt 中间夹doesnt doesnt 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.
2、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.210.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+dont+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）+doesnt +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.Jacks 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.
