There is a book.改为复数形式

There is a book.改为复数形式 there is a book on the desk改为复数句 This is a book 改为复数句 this is a book改为复数形式 Is that a book改为复数形式 There is a book and a pen on the table改为复数句 There is a book on my desk.(改为复数句） There is a book on the table 改为复数的句子 there is a book in my bags.（改为复数）( ) ( ) some ( ) in ( ) bags. This is my book.(改为复数形式) There is a nice cat in the tree.(改为复数形式)Those are rulers.(改为单数形式) Are there some boys in the picture?做肯定回答 Is there a book in your bag?改为复数句 There is a flower(改为复数句) There is a storybook.(改为复数形式) This is my book.改为复数形式 There is a nice cat in the tree.改为复数形式 Those are rulers 单数形式 this is a chinese book改为复数句 There is a book on the chair.(改成复数) There is a child over there如何改为复数句 There is a hours over there(改为复数)怎么改