将下列句子改成否定句
问题描述：
将下列句子改成否定句
1.He is 10 years old
2.my clever sister has a car
3.my classmates have a football
4.he is an actor
5.we have some cookers
答
He isn't 10 years old.
My clever sister doesn't have a car.
My classmates don't have a football.
He isn't an actor.
We don't have any cooker.