Respostas
.Resposta: 1. The woman was not recognized.
2. Dinner is being cooked by Susan.
3. A tree can be planted by anyone.
4.Those ships were destroyed.
5. The President was asked many questions by journalists.
6. My elder brother was offered a job.
7. A story was told me by John.
8. I was told a story by John.
9. Biology is taught to Cecilia by George.
10. Letters are written by Bob.
11. The gate was opened.
12. The museum was built in 1809 .
13. The cake is being prepared.
14. Every week many motorcyclists are killed on our streets.
15. Claire wants to be arrived first.
16. The cat is being wheedled.
17 .My car has been stolen!
18. This house was built by my father.
19. Our planet is wrapped in a mass of gases.
20. I noticed that a window had been left open.
Explicação:
A voz passiva tem a diferença de dar o destaque para alguma coisa que está sofrendo a ação, ou seja, ela é utilizada para falar de forma indireta de que algo está sendo feito por alguém.
Biology is taught to Cecilia by George. (passive voice)
(sujeito) (obj. ind.) (ag. da passiva)