What is that?改为复数形式.

What is that?改为复数形式. What is that?itis a pen改为复数形式 what is that over there?(改为复数形式）快! What is it 改为复数形式 That is my sister改为复数形式 is that his key (改为复数形式) that is his sister改为复数形式 Is that a book改为复数形式 that is my dress.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 Is that a basketball?改为复数形式 what is that改为复数句 英语句的复数形式What is this?It is a desk.改为复数形式 What color is the woman's skirt?(改为复数形式) What is your telephone number?改为复数形式的句型 把“What is the sheep doing”改为复数形式 This book is in that box.（改为复数形式）