[{"role": "user", "content": "I'd like to learn some Italian for regret. Can you help me translate 'I can't undo it' into Italian?"}, {"role": "assistant", "content": "The translation for 'I can't undo it' in Italian is 'Non lo posso annullare.' If you want to express regret in Italian, you can also use phrases like 'Mi dispiace' (I'm sorry) or 'Sono pentito/a' (I regret it)."}, {"role": "user", "content": "That sounds useful. What's the difference between 'Mi dispiace' and 'Sono pentito/a'?"}, {"role": "assistant", "content": "'Mi dispiace' is a more general way of apologizing, while 'Sono pentito/a' expresses a deeper regret for something you did. However, in the context of your original sentence, 'Non lo posso annullare' is a more fitting translation for 'I can't undo it'."}]