Пассивный залог:
When was the work done?
Has the work been done?
The work was not done last week.
The work will not done tomorrow.
All observations were made by a team of famous scientists.
We were asked to come as early as possible.
Активный залог:
They often join me at the meetings.
Our relatives presented us with a bouquet of flowers.
They built this museum a century ago.
This museum was built a century ago.
When was this museum built?