PASSO 1Scegli l'opzione corretta
PASSO 2Aggiungi gli esercizi che ti piacciono ai Preferiti
Don't use the past perfect unless there is another verb in the past tense in the same sentence.
Use the present perfect (and not the simple present) for an action begun in the past and continuing into the present. I've been at this school two years means I'm still here.
Use the past participle (and not the past tense) with the auxiliary verb have and its parts.