That book is his?改为复数形式

That book is his?改为复数形式 That is his book.怎么改为复数句 This is my book,and that is his book(改为复数句） It is his book.改为否定句. That is my book.(改为一般疑问句）that book? Is that his book?中文是什么 That is my book改为一般疑问句 IS that her book. 改为否定句 Is that your book?改为同义句 Is that a book改为复数形式 Whose book is that?改为同义句 Whose book is that?改为复数形式 How much is that book?改为两意句 This book is his,that book is____(I) Is this your pencil?改为陈述句+复数Is this my pen?Is that his book?Is that her eraser?还有这几个？ that is his brother 改为复数句 is that his key (改为复数形式) that is his pencil改为复数句