that book yours,Bob.

that book yours,Bob. That book is yours为什么用yours不用your, 中文意思：that book is yours. that isn't your book,yours is here. This book ( ) Bob's.Look!That's his name. that book is bob's改成复数形式 This book is Bob's.That book is John.These books are_____. This book is yours 1.This book is mine.2.That eraser is yours.3.These boxes are This book i（ ）(my,mine).That one is（ ）(yours,your). This is ( ) book.your|yours The second______( book ) is yours.