Sometimes, the focus of a sentence is on the action itself, not on who performed it. For this, we can use the passive voice. For example, instead of saying 'Someone closed the road', we can say 'The road was closed'. In French, this is called 'la voix passive'.

To form the passive voice in the 'passé composé', you use the verb 'être' in the present perfect, followed by the past participle. This means 'a été' for singular subjects, and 'ont été' for plural subjects. Remember, the past participle must agree in gender and number with the subject. For example, 'la porte a été fermée'.

The passive voice is often used for public information, like in news reports or announcements. A common example is 'La route a été fermée', which means 'The road has been closed'. Another example is 'Le vol a été annulé', meaning 'The flight has been cancelled'.