[{"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": "The translation of 'I know your sister' in Italian is 'Io conosco sua sorella.' You can use this phrase to let your friend know that you are familiar with their sister, and it should help facilitate a smooth conversation."}]