Linda: Hello, Paul, is this your pencil?
Paul: Yes, it is. Thank you, Linda.
Linda: Is this your book?
Paul: No, it isn’t. I think it’s Mary’s.
Linda: Mary, is this your book?
Mary: No, it isn’t. My book is here. Ask Bill. I think it’s his.
Linda: Bill, is this your book?
Bill: Yes, it is.
Linda: Here you are.
Bill: Thank you. But where is my schoolbag?