Mike: Where is my pen?
Yang Ling: Is that your pen?
Mike: Where?
Yang Ling: Look! It's behind the chair.
Mike: It's a red pen. It's not my pen. My pen is blue.
Yang Ling: Oh, it's Lily's!
Mike: Where is my pen then?
Yang Ling: Is this your pen? It's in your book.
Mike: Oh, yes. Thank you.