Bonjour,
Réponse :
1. Amy Jones killed Brian O'Neill.
→ Brian O'Neill was killed by Amy Jones.
2. The detectives found footprints in the apartment.
→ Footprints were found ( by the detectives ) in the apartment
3. Megan sent a letter to Julie.
→ A letter was sent ( by Megan ) to Julie.
4. Mrs. Kat Perry and Ryan Bossling heard a big bang.
→ A big bang was heard by Mrs. Kat Perry and Ryan Bossling.
5. Julie Logan arrested the murderer.
→ The murderer was arrested by Julie Logan.
Explications :
Passif :
Be ( au temps de la voix active ) + participe passé
Les phrases sont au prétérit donc : was/were + participe passé
N'hésite pas si tu as des questions ;)