it is her book复数形式

it is her book复数形式 This is her book的复数形式 Is that her English book?复数形式 It is her book和He is my uncle 怎么改成复数形式? It is Mike 's book改为复数形式 Her math book is yellow 的复数形式,马上就要用啊! 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 It's an english book.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 It is a new book 怎么改为否定的复数形式急! him her it 的复数形式是什么 It is an English book.（复数） Is it your book?复数句 改为复数；WHOSE BOOK IS IT