问题描述：
Those are my book?对my提问 Are they your teachers
Those are my book?对my提问
Are they your teachers?否定回答
Dave and Anna are my friends一般疑问句
Those are my book?对my提问
Are they your teachers?否定回答
Dave and Anna are my friends一般疑问句
问题解答：
我来补答展开全文阅读