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Passive - Use
We only use the passive when we are interested in the object or when we do not know who caused the action.
Example: Appointments are required in such cases.
We can only form apassive sentence from an active sentence when there is an object in the active sentence.

Form
to be + past participle
How to form a passive sentence when an active sentence is given:
- object of the"active" sentence becomes subject in the "passive" sentence
- subject of the "active" sentence becomes "object" in the "passive" sentence" (or is left out)
Active: | Peter | builds | a house. ||
Passive: | A house | is built | by Peter. |

Examples
Active | Peter | builds | a house. | Simple Present |
  | |
Passive: | A house | is built | by Peter. | |

Active: | Peter |built | a house. | Simple Past |
  | |
Passive: | A house | was built | by Peter. | |

Active: | Peter | has built | a house. | Present Perfect |
  | |
Passive: | A house | has been built |by Peter. | |

Active: | Peter | will build | a house. | will-future |
  | |
Passive: | A house | will be built | by Peter. | |

Active: | Peter | can build | a house. | Modals |
  | |Passive: | A house | can be built | by Peter. | |
Decide whether the sentences are written in Active or Passive. Match all the items on the right with the items on the left, then press "CHECK". Check  |
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Principio del formulario
They listen to music.    active | active |     |
She is reading an e-mail.     | active |     |
Thesecars are produced in Japan.  passive  | passive |     |
Alan teaches Geography.    active | active |     |
German is spoken in Austria.    passive | passive |     |
Lots of houses were destroyedby the earthquake.     | Passive |     |
Henry Ford invented the assembly line.     | activo |     |
The bus driver was hurt.     | passive |     |
You should open your workbooks.     | Active...