1/ D.E Hughes invented microphone in 1878.
→ Microphone was invented by D.E Hughes in 1878.
2/ Do people speak Spanish in Brazil?
→ Is Spanish spoken by people in Brazil?
3/ Someone will list my name in the new telephone directory.
→ My name will be listed in the new telephone directory.
4/ A plumper is going to fix the leaky faucet.
→ The leaky faucet is going to be fixed by a plumper.
5/ Someone has changed the name of this street.
→ The name of this street has been changed by someone.