Hi, Toaha—If it is "again" that doesn't make sense to you, it signals that the speaker is asking the interlocutor to tell him something that he had told him before. If it is the construction "How was it that you convinced me to . . . ?" that doesn't make sense to you, that is a (clefted) rearrangement of "How did you convince me to . . . ?" Similarly, instead of saying, "You convinced me to jump out of this plane by giving me a hundred dollars," we can say, "It wasby giving me a hundred dollarsthat you convinced me to jump out of this plane."
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