根据提示写一篇英语短文: 昨天你在教室里扫地时发现一本电脑书，让你推断是某个同学的，并说明理由

yesterday i found a computer textbook nearby the teacher cabinet when i was doing my cleanup work. this book was not signed with any of names so that i guessed this was not belonging to inmates of our class. however i think as i was home, with the book, if this book was not one of our classmates' why it was in our room. therefore i'm gonna find the loser out tomorrow.

丢电脑书的那个同学的