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 baseballs                   under 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.