That's my book!
那是我的书！
No, it isn't.
不，才不是。
This is my book.
这是我的书。
That's my pencil case and my pen and pencil.
那是我的铅笔盒、钢笔，还有铅笔。
Oh! That's my rubber and ruler.
哦，那是我的橡皮和尺子。
Oh! This isn't my school bag.
哦，这不是我的书包。
That isn't my school bag.
那个不是我的书包。
Sorry! This is your school bag. Here you are!
对不起！这是你的书包。给你！
Thank you! And this is your school bag.
谢谢！这个是你的书包。