Whose new ruler is this?这句存在错误吗?

Whose is this ruler?(同义句) whose ruler is this的同义句 whose ruler is that?同义句 Whose is this new black bike(同义句) --Whose new pen is this?--It is Bob's.这句话是否正确,如果错误就改正 whose ruler is longer? is this ruler your?yes .找出错误 ThiS ruler is long.同义句 ThiS ruler （ ） （ ) they dont have the same look.gai同义句 this is his new ruler.ar 同义句 1.They don't have the same look. 2.This is his new ruler Whose book is this和Whose is this book是同义句吗? is this her ruler?的同义句