In "The Last Lesson," Franz regrets most that he hadn't focused on his lesson when he had the chance.
As M. Hamel said that it was their last French class, Franz came to the understanding he had so much more to learn and as such felt bad or sorry for wasting away his time and not attending his lessons.
Therefore, In "The Last Lesson," Franz regrets most that he hadn't focused on his lesson when he had the chance.
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