1. They built the bridge 10 years ago.
=> This bridge was build ten years ago.
2. Someone stole Nam’s wallet.
=> The windows were broken by the boys yesterday.
3. She bought a new hat last night.
=> A new hat was bought by her.
4. No one believes his story.
=> His story isn't believed.
5. She showed her ticket to the airline agent.
=> Her ticket was showed to the airline agent by her.
6. Our teachers have explained the English grammar.
=> The English grammar has been explained by our teachers.
7. They finished the kitchen’s building on Saturday.
=> The kitchen's building was finished on Sunday.
8. Tom will visit his parents next month.
=> Tom’s parents will be visited next month.
9. The students have discussed the pollution problems since last week.
=> The pollution problems have been discussed by the students last week.
10. We should clean our teeth twice a day.
=> Our teeth should be cleaned twice a day.
cho mình xin ctlhn nhé