Yes,it is.
Yes,they are.
Yes,those are his brothers.
No,it isn't.
No,they aren't.
No,those aren't his brothers.
Is he your brother?
Are these your books?
Are they your classmates?
各写三个肯定、否定、疑问句（英语）
Yes,it is.
Yes,they are.
Yes,those are his brothers.
No,it isn't.
No,they aren't.
No,those aren't his brothers.
Is he your brother?
Are these your books?
Are they your classmates?