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Ralph and Jack looked at each other while society paused about them. The shameful knowledge grew in them and they did not know how to begin confession.
Ralph spoke first, crimson in the face.
He cleared his throat and went on.
"Will you light the fire?" (2)
When the story begins, Jack and Ralph are such civilized lads that they don't even know how to start a fire without a match. Someone's not getting the wilderness survival badge.
There was a space round Henry, perhaps six yards in diameter, into which [Roger] dare not throw. Here, invisible yet strong, was the taboo of the old life. (4.14)
"The old life" is civilization. Roger is losing it, but he isn't quite gone. Civilization and all its rules are still holding him back—for now. In a few more chapters, it'll be all savage, all the time.
Piggy was […] so full of pride in his contribution to the good of society […] that he helped to fetch wood. (8.118)
Ugh, Piggy, you're breaking our hearts. He's basically the only person who seems to care about the "good of society," so naturally he ends up dead. Without people who care about the common good, you don't have much of a civilization.