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

34j. Transform the following sentences into the passive 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):

34j. Transform the following sentences into the passive 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. Women have done those things for centuries
2. People have never seen a rain storm like it
3. They have been asking difficult questions
4. They have been doing that for 10 years
5. Lisbeth has been doing physical therapy
6. Mr Mañas has been teaching English for decades
7. Teachers must grade tests as soon as possible
8. You must plan the acivities
9. People must stop this at once
10. The policeman must not have seen the thief