you,your,yours

YOU
可作主詞也可作受詞.
主詞:
You are a girl.
妳是一個女孩.
受詞:
I love you.
我愛你.

YOUR
就是中文的"你的",但後面一定要說明是"你的甚麽",也就是賓語
如:
It is your book.-----對
這是你的書.
It is your.-----錯
中文(這是你的)是說得通,但外國人會以為你還沒說完.

YOURS
中文的"你的",這和YOUR剛剛相反,後面一定一定不能加賓語.
如:
It is yours book.-----錯
It is yours.------對
這是你的.
This book is yours------對
這本書是你的.

You have a book.
The book belongs to you.

This is your book. (Here the YOUR is an ADJECTIVE. It describes the noun BOOK; it tells people that the book belongs to you.)

This book is yours. (Here the YOURS is a PRONOUN. It actually represents YOUR BELONGING. The book in front explains that it is YOUR BOOK.)

you=你...your=你的....yours=你的