That's my book!
那是我的书
No, it isn't. This is my book.
不 这是我的书
That's my pencil case and my pen and pencil.
那是我的铅笔盒和我的钢笔 铅笔
Oh! That's my rubber and ruler.
oh那是我的橡皮和尺子
Oh! This isn't my school bag.
这不是我的书包
That isn't my school bag.
那不是我的书包
Sorry! This is your school bag. Here you are!
不好意思 这是你的书包 给你
Thank you! And this is your school bag.
谢谢 这是你的书包