1. Houses aren't built very quickly.
Are houses built very quickly?
2. This work won't be finished tomorrow.
Will this work be finished tomorrow?
3. The delegation wasn't met at the station.
Was the delegation met at the station?
4. Has the article been translated into Russian?
The article hasn't been translated into Russian.
5. The work can't be done tomorrow morning.
Can the work be done tomorrow morning?
6. The doctor hasn't been sent for.
Has doctor been sent for?