Ralph learns from Samneric that Jack plans to have his tribe hunt him the next day and that Roger has sharpened a stick at both ends.
Ralph learns of Jack's plans for him in Chapter 12 when he overhears Samneric's conversation about Jack's intention to hunt him like a pig. This revelation prompts Ralph to flee for his life through the jungle while being hunted by Jack and his tribe.
In the book you learn some last names like Jack's but you never learn Ralph's.
Samneric tell him while they are on guard at Castle Rock.
Ralph learns to swim after Jack and the hunters let the signal fire go out and miss a chance to be rescued by a passing ship. The realization that they may never be rescued prompts him to take action and learn to swim to explore opportunities to escape the island.
Ralph learns of Jack's plans for him through Samneric, who are forced to join Jack's tribe and spy on Ralph's group. Samneric bring Ralph news of Jack's intentions to hunt him down and kill him. This betrayal shows Ralph the extent of Jack's animosity towards him.
he boy with the mulberry colored birthmark goes missing, we never learn his name however.
The chapter is called In Which I Learn to Season My Food
At the begining of the chapter, while Ralph and Piggy are bathing in the pool Ralph asked "Where's everybody?" Ralph specifically refers to Samneric and Bill, which would indicate that he believed that there were at least five boys in his group, including himself. Piggy pointed beyond the platform and replied "That's where they have gone. Jack's party." So in fact all that actually remained of Ralph's group were Ralph and Piggy. By the morning after the party, and the killing of Simon, Samneric had rejoined Ralph's group.
In chapter 9, we learn that Dimmesdale's health is beginning to fail. He looks pale and thin.
Yes they do learn
Visit Warwick Castle through the related link to learn about its history.
Courtenay Castle has written: 'Learn to dance' -- subject(s): Ballroom dancing