Is this a book?的复数句

Is this a book?的复数句 This is a book 改为复数句 this is a chinese book改为复数句 Is this your book ? 变为复数句 lt this a book 改成复数句 Is this a book?的复数形式是什么?3Q this is a book改为复数形式 This is her book的复数形式 改成复数句This is a book.That isn't an egg.Is this a book?Yes,is is.Your picture is very good. this is my book（改为复数句） Is this an English book?改为复数句 this is an English book 改为复数句 this is my book帮我改为复数句 改句 whose story book is this?(复数） This book is very interesting（变为复数句） here is your book.的复数句 That book is new的复数句 This book is new.复数