Breakdown of Credo che il corriere abbia danneggiato il pacco prima della consegna.
avere
to have
di
of, from
il pacco
the package
credere
to believe
Questions & Answers about Credo che il corriere abbia danneggiato il pacco prima della consegna.
Why do we use the past subjunctive (abbia danneggiato) here instead of the present subjunctive?
The main clause Credo che (I believe that) is in the present tense, but the damaging of the package happened before you formed this belief. To show that the action in the dependent clause happened in the past compared to the present-tense trigger, we use the past subjunctive.
How exactly do we form abbia danneggiato?
Just like the normal past tense (passato prossimo), it is made of two parts. You take the present subjunctive of the helping verb avere—which is abbia to match il corriere (he/it)—and add the past participle of the action verb, danneggiato.
Since it happened in the past, could I just use the regular past tense and say Credo che il corriere ha danneggiato...?
No, you must use the subjunctive mood here. The phrase Credo che expresses a personal opinion or belief, which acts as a trigger. Whenever a trigger like this introduces a dependent clause, the verb in that clause must be in the subjunctive, not the regular indicative.
Why is it prima della consegna and not just prima la consegna?