被动:The window was broken by him.这个窗户是他打破的.
主动:He broke the window.他打破了窗户
句型:be(am,is are)+过去分词+by sb(宾格)
注意时态要一致
感官动词变被动语态:Sb be {seen}(感官动词的过去分词)
We usually hear him play in the next room.