改为复数形式：book,pen,banana,orange,pear

改为复数形式：book,pen,banana,orange,pear It is my pen.(改为复数形式) This is a pen.(改为复数形式) It's a calculator改为复数形式It's a pen.It's my key.That's a clock.It's her book都改成复数形式 this is a book改为复数形式 There is a book.改为复数形式 Is that a book改为复数形式 Whose book is that?改为复数形式 That book is his?改为复数形式 What is that?itis a pen改为复数形式 This book is in that box.（改为复数形式） How much is this English book?(改为复数形式） This is an Enlish book.(改为复数形式) That's an English book.(改为复数形式) it's a naw book改为复数形式 It is Mike 's book改为复数形式 it's a new book 改为否定的复数形式 the book is on the shelf.改为复数形式