1 The stunami destroyed a large area in Japan last week
a large area was destroyed by the stunsmi in japan last week
2 people speak english in many countries over the world
english is spoken in many countries over the world
3. The workers are painting the house green
the house is being painted green by the workers
4 You must finish these exercise before 4 o'clock
these excercise must be finished before 4 o'clock
5 They have built a new airport
a new airport has been built
1 The stunami destroyed a large area in Japan last week
=> a large area wasdestroyed by the stunami in Japan last week
2 people speak english in many countries over the world
=> english is spoken in many countries over the world
3. The workers are painting the house green
=> The house is being painted green by The workers
4 You must finish these exercise before 4 o'clock
=> These exercise must be finished before 4 o'clock
5 They have built a new airport
=> a new airport has been built