Levels in English A1 - Sorry. A2 - I'm sorry. B1 - l apologize. B2 - My apologies. C1 - I deeply regret. C2 - I sincerely apologize. _____________________________ A1 - Thank You. A2 - Thank you. B1 - I appreciate it. B2 - Many thanks. C1 - Much appreciated. C2 - I'm grateful. _____________________________ A1 - No. A2 - No, thanks. B1 - I don't think so. B2 - Not really. C1 - I doubt it. C2 - By no means.