Ponyboy reads the letter sent by his buddy, Johnny. Ponyboy then realizes that it's too late to tell Dally. Because Dally was dead.
(Says in his mind) How can I tell Dally now, he's dead.
Dear Ponyboy, I asked the nurse to give you this book so you can finish it. Remember Ponyboy, Stay Gold, Ponyboy, Stay Good and Pure. Sincerely, Your buddy Johnny.
Ponyboy then Remembers the night of when Dallas (Dally) died. And Ponyboy remembers what Dally always wanted.
Ponyboy now decides to write about his life for his English essay assignment.
I'm gonna write about my life for my essay assignment.