[{"role": "user", "content": "I'm trying to understand a scene where someone is unable to prevent another person's actions, and I'd love to know how to express the sentence 'He can't stop him' in Italian to better convey the situation."}, {"role": "assistant", "content": "The sentence 'He can't stop him' can be translated to Italian as 'Lui non riesce a fermarlo.' This translation accurately conveys the idea that one person is unable to prevent or halt the actions of another."}]