1、复数形式:Those are her sons.
疑问句:Is that his son? 肯定回答:Yes,it is! 否定回答:No, it is not.
陈述句:This is her son.
2、复数形式:Those are my brothers.
疑问句:Is that your brother? 肯定回答:Yes,it is! 否定回答:No, it is not.
陈述句:This is my brother.