初中英语短文填空句型转换

按要求改写句子
Is that your brother?(做否定回答)
No, .
The baseballs are under the bed.（改为否定句）
The baseballsunder the bed.
These boys are my classmates. （改为一般疑问句）
these boys classmates?
His grandparents are fine.（就划线部分提问）
his grandparents?
He’s Jack. （改为同义句）
is Jack.