Rule reminder
Key markers of formal Italian: 'Lei' pronoun, third person singular verbs, 'Suo/Sua', 'La/Le', conditional forms, vocabulary like 'vorrei', 'potrebbe', 'a mio avviso'. Informal markers: 'tu', second person verbs, 'tuo/tua', 'ti/te', direct imperatives.
'Come stai?' — What register?