[{"role": "user", "content": "I'm trying to learn Italian and I'm stuck on the sentence 'Did you call Tom?' Can you help me translate it?"}, {"role": "assistant", "content": "Certo! (Of course!) The correct translation is 'Voi avete chiamato Tom?'"}, {"role": "user", "content": "That's perfect! I was trying to use 'tu' instead of 'voi'. Can you explain the difference between 'tu' and 'voi'?"}, {"role": "assistant", "content": "In Italian, 'tu' is used for informal singular (speaking to one person you know well), while 'voi' is used for formal singular (speaking to one person you don't know well) or informal plural (speaking to multiple people you know well). So if you were speaking to Tom informally, you would say 'Tu hai chiamato Tom?'"}, {"role": "user", "content": "That makes sense. So what would be the formal version of the sentence 'Did you call Tom?'?"}, {"role": "assistant", "content": "In formal situations, you would use the formal singular 'Lei' (although 'voi' is also accepted in some regions), and the verb conjugation changes to the third person singular. So the formal version of the sentence would be 'Lei ha chiamato Tom?' or 'Voi avete chiamato Tom?' (as we previously discussed)"}]