Turn from active into passive
You can't use cameras inside the gallery.
Have they sent the invitations?
Mr Roberts drove the kids to school.
They had tidied their room by 7 o'clock.
Someone left the window open.
You ought to send the email now.
Tim didn't break the mirror.
Answers & Comments
Have the invitations been sent (by them)?
The kids were driven to school by Mr Roberts.
Their room had been tidied by 7 o'clock.
The window was left open.
The email ought to be sent now.
The mirror wasn't broken by Tim.