Those are eggs.（改为单数句）怎么办?

Those are eggs.（改为单数句）怎么办? what are those?改为单数 Are those apples 改为单数 Are they eggs?如何改为单数句? they are eggs改为单数句 those are boys.改为单数句 改为单数句:Those are orange oranges. those are my brothers.改为单数句 Are those his friends?改为单数形式 Those are my friends 改为单数句 Are those your friends?(改为单数句) Those are some keys.(改为单数） those are orange towels改为单数句 Those are books 改为单数句子急 Those are erasers 改为单数形式 Those are rulers 改为单数形式 快 those potatoes are bad.改为单数句子 Are those orange desks?改为单数