Question

this book is mine.对mine 提问，我写成了whose book is this.这样可以吗？答案给的是whose is this book

Answer 1

This is _my_book.对划线处提问，Whose book is this? This book is mine.对后边提问，whose is this book？凡是这类句子都可以这么用，希望对你有帮助不明白追问就ok。