You already do all this — in Hindi, every day
Switching register is second nature to you: 'aap' for an elder or stranger maps onto 'Lei', and 'tum' for a friend maps onto 'tu' — let that instinct carry straight into Italian. Marking 'since when' with 'se' (kal se = da ieri) is the same instinct as Italian 'da'. And the warm, talkative back-and-forth of Indian chat is exactly what social Italian rewards — short turn, then 'e tu?'. The skill of Day 30 isn't new words; it's stringing a real day together without stopping to translate.
