什么叫被动式？

主语是动作的承受者

动语态结构 be +过去分词 +by 行为发出者
主动语态 He cleans the room .
被动语态 The room is cleaned by him.
否定句 The room isn’t cleaned by him.
疑问句 Is the room cleaned by him?

译成汉语的被动语态。英语中的许多被动句可以翻译成汉语的被动句。常用“被”, “给”, “遭”, “挨”, “为……所”, “使”, “由…”, “受到”等表示。

be done