Alice：Hi，Peter, is this your pencil?

  Peter：No．I don't have a pencil．

  Alice：Mary，is this your pencil?

  Mary：No，it isn't．My pencil is yellow．

  Alice：John，is this your pencil?

  John：No．Look，this is my pencil．My pencil is blue．

  Joe：I can't find(找到)my pencil．It's green．Do you see it，Alice?

  Alice：Is this your pencil?

  Joe：Yes，it is．Thank you，Alice．