Change the passive voice into active:
The National Gallery was broken into last night. The alarm system had been broken before they climbed through a window. Some priceless works of art were stolen. A car was used to escape. Some suspects have been questioned by the police. The thieves haven’t been caught yet.
Someone broke into the National Gallery last night. The thieves had broken the alarm system before they climbed through a window. They stole some priceless works of art. They used a car to escape. The police have questioned some suspects. They haven’t caught the thieves yet.
Bob’s bike was stolen yesterday. The thieves weren’t seen. The police have been already called. The suspects will be questioned tomorrow. The thieves will be caught by the police.
Somebody stole Bob’s bike yesterday. They didn’t see the thieves. They have already called the police. They will question the suspects tomorrow. The police will catch the thieves.