<span>When I first beheld this apparition—for I could scarcely regard it as less—my wonder and my terror were extreme.”</span>
Tybalt is Juliet's cousin, originally, Tybalt wanted to duel Romeo instead. But since he and Juliet are married, he cannot fight Tybalt as he is basically his cousin-in-law, thus, Romeo rejects Tybalt's challenge. Mercutio finds this quite cowardly as a result he himself challenges Tybalt to fight.
Though i can’t write your paragraph for you, i recommend searching up a website that has a summary of the great gatsby and use that for your textual evidence. as for your definition of greatness, i can’t answer that for you because it’s up to interpretation, but if you need any more help, let me know!
