Mike: I can't find my bag. What's in that big box? Do you know?
John: Let me see. There's a bag.
Mike: Are there any pencils in the bag?
John: No, there aren't. But there are some books.
Mike: Are there any English books?
John: No, but there are some Chinese books in it. Is it your bag?
Mike: I don't think so. There aren't any Chinese books in my bog, but there are two English books.
John: Oh, I'm sorry. It's not your bag.
