1 Students take exams twice a year. (Present Simple Active)
Exams are taken by students twice a year. (Present Simple Passive)
2 Ann is writing a letter now. (Present Continuous Active)
A letter is being written by Ann now. (Present Continuous Passive)
3 Next year they will build a bridge here. (Future Simple Active)
Next year a bridge will be built here. (Future Simple Passive)
4 James Cameron wrote and directed Avatar. (Past Simple Active)
Avatar was written and directed by James Cameron. (Past Simple Passive)
5 I have just written this letter. (Present Perfect Active)
This letter has just been written by me. (Present Perfect Passive)
