Ann had fed the cats before she went to the cinema. → The cats had been fed by Ann before she went to the cinema.

The students have discussed the pollution problems since last week. → The pollution problems have been discussed by the students since last week.

The thieves have stolen the most valuable painting in the national museum. → The most valuable painting in the national museum has been stolen by the thieves.

They speak three languages in Canada. → Three languages are spoken in Canada.

My father is repairing those shoes. → Those shoes are being repaired by my father.

He has broken his nose in a football match. → His nose has been broken in a football match.