Passato prossimo o imperfetto?

Difference bewteen passato prossimo and imperfetto
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Passato prossimo → punctual / unusual / temporary / concluded actions

The passato prossimo is used for actions happened in the past and that have a start and an end. The passato prossimo, unlike the present perfect in English, is also used to describe an action that took place at a specific time.

Esempio: L'anno scorso ho visitato Roma


Imperfetto → repetitive / habitual / continuous actions / contextual situations

The imperfetto is used for actions that used to happen or happened in the past and have not a clear start / end. They are likely carried out for a continuous or undetermined period of time.

The imperfetto is also used to simply describe something in the past: the weather or the time, how a person was feeling or thinking...

Imagine the imperfetto as a line, indicating a duration. We are interested in the fact that the action or the state lasted for some time; we do not describe the action as completed, but in its development.

Esempio: Da piccolo andavo a scuola sempre a scuola in bicicletta
TIP! When in doubt to use the imperfetto, ask yourself if "used to" would be a good translation.
In that case, it is the right tense to use.
In many cases the passato prossimo and the imperfetto can be both used: all depends on what you want to express.

Da bambino avevo i capelli lunghi → imperfetto, referring to a continuous state throughout the childhood.

Da bambino ho avuto i capelli corti → passato prossimo, referring to a specific period of the childhood.
Simultaneous past actions
If in a sentence there are two actions having place at the same time, we can have:

1. imperfetto + imperfetto → Mentre cucinavo, mia madre apparecchiava la tavola.

2. passato prossimo + passato prossimo → Quando è arrivato a casa, ha sorpreso tutti.

3. imperfetto + passato prossimo (or viceversa) → Mentre leggevo, ho ricevuto un messaggio sul cellulare.
(The imperfect "of situation" constitutes the background on which, in the foreground, the facts expressed by the passato prossimo take place).