Past participle é a forma do verbo que é usada na formação dos tempos perfeitos e também da voz passiva; pode ser usada também para formar alguns adjetivos.

Lucy has just left her flat.

I had done all my chores by the time my parents arrived.

The bookstore was robbed last night.

Access to the building has been denied.

Teachers have gone on a strike.

The dog has found another human bone!