Jawaban:

1. My mother bought many oranges.

Passive voice is : many oranges were bought by my mother

2. Dolph will play the guitar at the stage.

Passive voice is : the guitar will be played by dolph at the stage

3. Sandra uses the glasses every day.

Passive voice is : the glasses are used by Sandra everyday

4. The students spoke English at class last night.

Passive voice is : english was spoken by the students at class last night.

5. We have watched the movie.

Passive voice is : the movie has been watched

6. Gina does this assignment.

Passive voice is : this assignment is done by Gina

7. They don't do this assignment?

Passive voice is : this assignment is not done

8. Does lucy do this assignment?

Passive voice is : is this assignment done by lucy?

9. The lion eats meat.

Passive voice is : meat is eaten by the lion

10. The cow doesn't eat meat.

Passive voice is : meat isn't eaten by the cow

11. Does that animal eat meat.

Passive voice is : is meat eaten by that animal?

12. We watch a movie.

Passive voice is : a movie is watched by us

13. I don't watch the news.

Passive voice is : The news is not watched

14. Does john watch the big matches?

Passive voice is : do the big matches watched by john?

15. My mother makes some cakes.

Passive voice is : some cakes are made by my mother