Difference between "you" and "your"



Hello! "You" is a pronoun used for the person you're talking to, while "your" is a possessive adjective showing ownership. So, it should be "Your book is on the table," not "You book is on the table."
In your nephew's sentence, "You book is on the table," it should be "Your book is on the table," because you're indicating that the book belongs to the person you're talking to (your nephew). Hope that helps!