The door has opened of itself.为什么不用被动啊,

the door opened为什么不用被动语态? 单句改错：The door has been opened itself The door opened ______ (by itself / of itself). 究竟哪个正确? I was going to open the door when it opened of itself.什么意思? the door opened为什么没有被动语态 be the door opened by itself the door was open by itself哪一个对 I found the door of the shop closed.为什么能这样啊,这是什么格式,被动时态不用BE吗 He opened the door.变被动语态 Who opened the door?改为被动语态. the door 应该是is opened,为什么还有the door opened啊 He has opened the door.和He opened the door.有什么区别? The door closed of itself的汉语意思是什么