Are those pens改为单数句

Are those pens改为单数句 Those are his pens,翻译成单数句 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 Those are my friends 改为单数句 Are those your friends?(改为单数句) those are orange towels改为单数句 Are those her erasers改为单数句 Are those erasers?改为单数句 those are his sistexs 改为单数句 those are cars 改为单数句 Those are old storybooks.(改为单数句) those are fresh cucumbers改为单数句 Are those your cups?改为单数句 Those are blue pens的单数形式 this is my ruler改为复数句肿么改啊?these are his pens.改为一般疑问句 Are those your parents?作肯定回答‘ those are her brothers.改为单数句 【they are】 my grandparents.对括号部分提问 （） （）your grandparents? Those are my pens改为一般疑问句