whoes is this chair?（同义句）

whoes is this chair?（同义句） whoes is this book与 whoes book is this 区别.还有同义句. is this her chair的同义句 This chair is orange.(改成同义句) Whoes ruler is this.（改错） There is no chair in this room.(同义句) whoes hat is this?为什么要加whoes和变否定句 how much is the chair 同义句 whoes cds are these?的同义句 Whoes books are thoes?改同义句 I spend 50 yuan on this chair.改为同义句. This is chair/This is a chair.这两句哪一句是错误的?