Question

把下列句子改为否定句。

He is a good boy at home.
He comes to school early.
He makes noise in class.
Amy likes swimming.
Her mother writes rules for her.

Answer 1

这些都是很基础的肯定句和否定句之间的转换。
有be动词的在be动词后加not，无be动词的，在实意动词前加助动词do（根据语境改变时态）+not，并把后面的动词变成原形。
He is not a good boy at home.
He doesn`t come to school early.
He doesn`t make noise in class.
Amy doesn`t like swimming.
Her mother doesn`t write rules for her.

Answer 2

He isn't a good boy at home.
He doesn't come to school early.
He doesn't make noise in class.
Amy doesn\t like swimming.
Her mother doesn't write rules for her.

Answer 3

他在家是个好男孩
他来学校来的非常早
他在教室吵闹
Amy喜欢游泳
她的妈妈写了规则给她

Answer 4

He isn't a good boy at home
He doesn't come to school early
He doesn't make noise in class
Amy doesn't like swimming
Her mother doesn't write rules for her 就是这样