Rule reminder
In complex narratives with multiple time frames, 'come se' clauses must anchor their tense to the verb they modify, not to the overall narrative tense. A trapassato main verb may govern a 'come se' clause that itself refers to an even earlier time — requiring trapassato congiuntivo. A present main verb in a literary present tense context still uses imperfetto congiuntivo for current unreality. Master the principle: tense of 'come se' = relative to the verb it modifies.
«Leggeva quei vecchi diari come se ___ appartenuto a un'altra persona, come se quella ragazza non ___ mai lei.»