Passato prossimo
Present perfect
“Una tempesta ha distrutto la loro barca, ma i tre sono riusciti a nuotare fino all’isola”
(A storm destroyed their boat, but the three managed to swim to the island)
In this sentence, the verbs “ha distrutto” (destroyed) and “sono riusciti” (succeeded) are both in the passato prossimo tense, because they refer to a specific event that occurred in the past and has a clear end point.
However, as you surely have noticed, they have a difference: one takes the auxiliary verb “avere” (to have), while the other takes “essere” (to be).
In Italian, in fact, verbs can take either “avere” or “essere” as their auxiliary verb in compound tenses, depending on the verb itself and how it is used in the sentence.
Generally, transitive verbs (verbs that take a direct object) use “avere”. In our sentence “distrutto” is a transitive verb that takes “la loro barca” as its direct object, so it uses “avere” as its auxiliary verb.
In contrast, intransitive verbs (verbs that do not take a direct object) and some specific transitive verbs (such as verbs of motion and reflexive verbs) use “essere” as their auxiliary verb in compound tenses.
In our sentence, “riuscire” is typically used intransitively in Italian, often followed by an adverb or prepositional phrase that describes the outcome of the action.