[{"role": "user", "content": "I'm trying to communicate with a friend from Italy about a mutual acquaintance, and I was wondering how I could say 'I know your sister' in Italian so we can have a smooth conversation."}, {"role": "assistant", "content": "You can say 'Conosco tua sorella' to convey that message. This translates to 'I know your sister' in English, and it should help you have a smooth conversation with your friend."}]