These are eggs.They are small and white.改单数句

These are eggs.They are small and white.改单数句 they are eggs改为单数句 Are they eggs?如何改为单数句? these white and black TVs are theirs改同义句 These are eggs.(改为单数句）_ _ _eggs. these toothbrushes are new.改单数句 are these your erasers?改单数句 These are my horses改单数句 these are sone arms.改单数句 they are my friends改单数句 they are good friends 改单数句 they are offices.怎样改单数句