英文句子改为否定句

She is twenty years old.
my quite brother have a football.
She is an teacher.

she is not twenty years old
my quite brother have not a football
she is not an teacher

ps:这里都只是加上了not 分开来写的 你也可以连起来写

根据句子选择不同的词语,我帮你提供一些：不得不、不会不、非...不可、不能不.我举个例子：你一定知道小明家在哪!改为否定句：你不会不知道小明家在哪.懂了吗?把肯定句改为否定句不能改变句意的,不要听下面误导人.我以前也是按下面那样做的,后来等老师分析时才明白改为否定句时不可以改变原句句意的.

t have a football. She isn'She isn't twenty years old my quite brother doesn'