That is an English book.给为复数形式

That is an English book.给为复数形式 That is an English book的复数形式 That is an English book变成复数 Is that her English book?复数形式 改为复数形式 Is that an English book?What"s this in English?It is an english book复数形式 That's an English book.(改为复数形式) It's an english book.复数形式 It is an English book.（复数） Whose book is that?改为复数形式 l_______________!That is an English book. Is that an English book?如何回答