阅读题， 判断下列句子正误,。

John: Excuse me, can I use your ruler, please?

Amy: Sure. Where is my ruler?

John: Is it in your book?

Amy: No, it isn't.

John: Is it under the desk?

Amy: No.

John: Is it on your bag?

Amy: Yes, Look! It's on my bag. Here you are!

John: Thank you.

①The ruler is John's.

②The ruler is in Amy's book.

③The ruler isn't under the book.

④John wants to use the ruler.

⑤The ruler is on John's bag.