To add more detail to your stories in Italian, you sometimes need to talk about something that happened before another event in the past. In English, we use 'had' plus a verb, like 'I had already eaten'. In Italian, this is done with a tense called the 'trapassato prossimo'.

Let's start with how to form the trapassato prossimo. It's simple: you combine the 'imperfetto' tense of the auxiliary verb 'avere' or 'essere' with a past participle. For example, to say 'I had eaten', you use 'avevo', which is 'avere' in the imperfetto, and add the past participle 'mangiato'.

First, let's practice with the auxiliary verb 'avere'. The forms are 'avevo', 'avevi', 'aveva', 'avevamo', 'avevate', and 'avevano'. For example, 'Quando sono arrivato, lui aveva già mangiato' means 'When I arrived, he had already eaten'.