This is a soccer ball.（改为复数形式）：These are soccer balls
Does Peter have a ball.(作否定回答）：No,he doesn't
Mike doesn‘t have a computer game.(改为肯定句）：Mike has a computer game.
He has a computer.(改为否定句）：He doesn't have a computer
Do you have a brother?(改为陈述句）; I have a brother
They have many friends.(改为一般疑问句）:Do they have any friends?
希望对你有帮助,有不明白的地方再问哟! (*^__^*)