The window is shut regularly 怎么分析出是否为被动语态

The window is shut regularly 怎么分析出是否为被动语态 the students broke the window.被动语态 They smashed the window.改成被动语态 They smashed the window.改为被动语态 The sugar is too sweet to eat.中是否要改为被动语态?怎么改? 被动语态the window --------(broke)by the naughty boy yesterday The coach advises Li Na to train regularly.改为被动语态 将句子改成被动语态:They smashed the window. mike broke the window yesterday的被动语态是? Who has broken the window?改为被动语态 Mike broke the window yesterday改为被动语态? Mike broke the window yesterday (改成被动语态)