3.Those are pictures of their families.(改为单数形式)

3.Those are pictures of their families.(改为单数形式) Those are rulers 改为单数形式 快 are those japanese cars?改为单数形式 Those are erasers 改为单数形式 Those are her photos改为单数形式~ Those are oranges 改为单数形式 Those are gloves改为单数形式 Are those his friends?改为单数形式 Those are their aunts and uncles.变为单数形式 把Those are their potatoes .改为单数型式 Those are their teachers.（改为单数句） Those are my sisters改为单数形式是?