题目内容：

They are putting something into a big box.变被动语态
Something - - -into a big box - -

优质解答

They are putting something into a big box.变被动语态答案：Something is being put into a big box by them.解析：现在进行时的被动语态：am / is / are + being + 过去分词..something 不定代词作主语动词用单数...