-Whose book is this?
-It is mine.- Whose is this book?
- It is mine.帮个忙再多造几个句子，谢谢！你还要几个？3，4个谢谢Whose is the bike/car/room/house?It is his/hers/Tom's/Mike's.Whose clothes are these?
They are my clothes.足够多了。/ 表示可用前后任意一个，所以可以是多个句子。