Marco è inaffidabile, quindi non ho creduto alla sua promessa.

Questions & Answers about Marco è inaffidabile, quindi non ho creduto alla sua promessa.

How is the adjective inaffidabile formed?
It is built from the verb affidare (to entrust) or the reflexive affidarsi (to rely on). By adding the negative prefix in- (un-/not) and the suffix -abile (-able), you get inaffidabile, meaning "unreliable" or "untrustworthy".
Why is it alla sua promessa instead of just la sua promessa?
The verb credere requires the preposition a when it means believing a person, a statement, or a promise. Here, the preposition a combines with the definite article la (which is needed for the possessive sua) to form the articulated preposition alla.
Could I drop the article and just say a sua promessa?
No, Italian possessive adjectives almost always require a definite article, which is why we must use alla instead of just a. The main exception is for singular family members (like a suo fratello), but since promessa is a regular noun, the article is absolutely mandatory.
If I wanted to expand this sentence to say "his promise that he would arrive", how could I apply the colloquial imperfetto from this lesson?
You could say alla sua promessa che arrivava. Because this expresses a "future in the past" (he made a promise about an action that would happen later), formal Italian requires the past conditional (che sarebbe arrivato). However, in informal spoken Italian, you can replace that past conditional with the imperfetto.

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