Those are old storybooks.(改为单数句)
Those are old yellow shirts改为单数句
Those are old boxes. (改为单数)
Those are old libraries.改成单数句
Those are my friends 改为单数句
those are orange towels改为单数句
Those are oranges(改为单数句)
those are my brothers.改为单数句
Are those pens改为单数句
Are those your cups?改为单数句
Those are erasers.(改为单数句)
those are his sistexs 改为单数句
Are those erasers?改为单数句