被动语态改主动语态

被动语态改主动语态
1.Spanish is spoken in South America.
2.The plans will have to be revised.
3.All the words must be looked up in a dictionary.
4.Has John been cured of his heart illness?
5.The door should not have been left open all night.
6.We are afraid that we may be attacked at night.
7.We are being taught how to operate the new machine.