Lesson 23    The Book Is Mine    This is my English book. It belongs to me It is mine. That is your English book. it belongs to you, It is yours. Those books aren't ours. They belong to those boys over there. They are theirs. Why do we all have different books？ Because we belong to differ ent classes.    这本书是我的    这是我的英文书。它属于我。它是我的。那是你的荚文书。它属于你。它是你的。那些书不是我们的。它们属于那边那些男孩的。那些书是他们的。我们大家的书为什么不一样？因为我们属于不同的班级。