Why has Conor told no one else about his nightmare at the beginning of the story? How does Ness challenge Conor’s decision to keep this secret?

Conor has the chance to tell Miss Kwan about Harry bullying him several times. Why does he lie and say that everything is fine?

Consider the different items left behind after the monster visits Conor. What do the leaves, the berries, and the sapling represent after each visit?