1.Who broke a window in the woman's house?(被动)
Whom was a window in the woman's house broken by?
2.When I stayed in the town,I visited some schools.(保原意)
During my stay in the town ,I visited some schools
3.The film began two minutes ago(同上)
The film has been on for two minutes.
4.Only one can go there (同上)
Either you or he can go there
5.The problem is hard.Nobody can work it out.(合并)
The problem is too hard for everyone to work out.