When talking about things you wanted, could, or had to do, you must choose between the imperfetto and the passato prossimo forms of modal verbs like volere (to want), potere (to be able to), and dovere (to have to). The choice depends on whether the action actually happened or was just an intention.
The Imperfetto: Intentions and States
Use the imperfetto (volevo, potevo, dovevo) to describe a desire, capability, or obligation where the outcome is unknown or serves as background information.
Saying Volevo uscire (I wanted to go out) expresses your intention, but it doesn't reveal if you actually went out.
The Passato Prossimo: Completed Actions
Use the passato prossimo (ho voluto, ho potuto, ho dovuto) when the action definitively happened or failed. It focuses strictly on the result.
Saying Ho dovuto lavorare (I had to work) means the obligation resulted in action: you actually worked. Similarly, Non ho potuto means you were prevented and definitively did not do it.
Contrasting Intentions with Reality
You will frequently see these tenses paired to contrast what someone wanted to do (imperfetto) with what they actually did (passato prossimo).
| I wanted to attend the conference, but I had to work. | Volevo assistere al convegno, ma ho dovuto lavorare. |
| She wanted to sleep, but she had to study. | Voleva dormire, ma ha dovuto studiare. |
Notice how the first half of the sentence sets the scene with a desire (volevo, voleva), while the second half uses the passato prossimo (ho dovuto, ha dovuto) to explain the concrete action that took place instead.
Here are a few more examples where a past intention was interrupted by a concrete obligation, urgency, or reality:
| We wanted to leave, but we had to cancel everything due to an urgency. | Volevamo partire, ma abbiamo dovuto disdire tutto per un'urgenza. |
| We wanted to refuse the proposal, but we had to accept. | Volevamo rifiutare la proposta, ma abbiamo dovuto accettare. |
| I wanted to warn you about the inconvenience, but I couldn't. | Ti volevo avvertire dell'inconveniente, ma non ho potuto. |
Sometimes, the passato prossimo with potere shows you successfully managed to do something despite someone else's intentions:
| The director wanted to force me to cancel, but I was able to convince him. | Il direttore voleva costringermi a disdire, ma ho potuto convincerlo. |