Is it your book?复数句

Is it your book?复数句 Is this your book ? 变为复数句 here is your book.的复数句 Is it your ruler?改为复数句 Is it teacher's book?变为复数句 把Is it your salad?改为复数句 Is this your book?单复数句互变 it is her book复数形式 It is an English book.（复数） 改为复数；WHOSE BOOK IS IT it is your book对your提问 That book is new的复数句