[{"role": "user", "content": "I'm trying to learn some common phrases in Italian and I'm stuck on the sentence 'You know it.' Can you help me translate it?"}, {"role": "assistant", "content": "Yes, I'd be happy to help. The translation of 'You know it' in Italian is 'Lei lo sa'. This is a formal way of saying 'you know it', if you want to use an informal way you can say 'Lo sai'."}, {"role": "user", "content": "That's really helpful, thank you. What's the difference between formal and informal in Italian?"}, {"role": "assistant", "content": "In Italian, the formal way of speaking is used when you're talking to someone you don't know well, someone who is older than you, or someone in a position of authority. The informal way is used with friends, family, and people you're familiar with. So, if you're speaking to a friend, you would say 'Lo sai', but if you're speaking to a teacher or a stranger, you would say 'Lei lo sa'."}]