根据短文内容，判断下列句子正误。

      Tim, Sonia, Jim, Tina, Jenny and Ann are in the classroom. They find(发现) a pencil-box, a ruler, a pencil and a notebook on the desk. Tim asks Sonia, “Is this your pencil?” Sonia answers, “Yes, it is. Thank you.” Tim asks again, “Hi, Jim! Is this your ruler? “Jim answers, “No, it isn't. It's Tina's ruler.” “Is this your notebook, Jenny?” asks Tim. “Yes, it is,” answers Jenny.” Ann, is this your pencil-box?” asks Tim. “Yes, it is. Thank you.” answers Ann.