Hi Quoc, In Fool that he was! , is that relative pronoun or conjunction? I'm not good at naming things, but I'd say it's a conjunction.
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Tung QuocHi,
Is (1) correct? No, you have changed Nona's suggested phrase and, in so doing, simply made it incorrect. Follow Nona's advice, Quoc. You can say either "Foolish as he was" or "Fool that he was".
Foolish that he was, he dived into an empty swimm