The pattern
Si + verb (always lui/lei form) = "you / one / people / we" in general.
Asking what's allowed
| Si può fare il bagno qui? | Is swimming allowed here? |
| Si può parcheggiare qui? | Is parking allowed here? |
| Si può pagare con la carta? | Can you pay by card? |
| Si può fumare qui? | Is smoking allowed here? |
Bonus
| Come si dice "___" in italiano? | How do you say "___" in Italian? |
Coming later
Si passivante on signs: "Si affitta" (For rent), "Si vendono case" (Houses for sale) — different agreement rule, not yet covered.