Unit 2 Robots —— Grammar
动词不定式的被动语态
一、Revise the Passive Voice  主动语态 （the active voice）  被动语态（the passive voice）如： ①Everyone enjoys exciting sports. (主动语态)    主动语态表示主语是动作执行者;     ②Exciting sports are enjoyed by everyone.     (被动语态)    被动语态表示主语是动作承受者。
The window was broken by Tom .
主被动语态转换：
Tom broke the window.