34m. LA VOZ PASIVA. THE PASSIVE VOICE (Tema 60, desde la página 331 hasta la página 338 de Gramática Inglesa para Estudiantes Españoles).

34m. Transform the following sentences into the active voice. Do not mention the agent unless it seems necessary (60.1, 60.1.1, y 60.1.2; páginas 331, 332 y 333 de Gramática Inglesa para Estudiantes Españoles):

34m. Transform the following sentences into the active voice. Do not mention the agent unless it seems necessary (60.1, 60.1.1, y 60.1.2; páginas 331, 332 y 333 de Gramática Inglesa para Estudiantes Españoles):
1. The letter has been stamped
2. I wasn’t introduced to her mother
3. Lisbon was destroyed by an earthquake
4. That could be done much more easily by a machine
5. She was never seen at the bus stop by us
6. People shouldn’t be allowed by the police to park there
7. Hot meals are served by us till 10pm
8. A new house is being built by my parents
9. The skirt must be dry-cleaned by María
10. Was the bill paid?