[{"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 correct translation for 'I know your sister' in Italian is 'Io conosco vostra sorella.' You can use this phrase to let your friend know that you are familiar with their sister."}]