Помогите придумать примеры с преобразованием из Active Voice в Passive Voice.

Помогите, пожалуйста, придумать примеры (а то столько примеров не варит голова придумать)
с преобразованием из активного залога в пассивный залог (по образцу который будет указан ниже).

Нужно составить с такими временами как:
1. Present Simple (по 3 примера с каждым из предлогов: am,is,are (т. е. в сумме 9 примеров)
2.Past Simple (по 3 с предлогами was и were (т. е. в сумме 6)
3.Future Simple (по 3 с предлогами shall и will (так же в сумме 6 примеров получается)

Образец:
Present Simple:
They write letters every week. (active voice)
Letters are written by them every week.
Are letters written by them every week?
+ Yes, they are. Letters are written by the every week.
- No, they are not. Letters are not written by them every week.

Past Simple.
They write letters every week.(active)
Letters were written by them every week.
Were letters written by them every week?
+ Yes, they were. Letters were written by them every week.
-No,they were not. Letters и так далее.