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How are both foreshadowing and irony displayed in the last chapter?
Irony – When Hassan gets his harelip fixed, everyone thinks that he will show it off by smiling more." Then his lips twisted, and, that time, I knew just what he was doing. He was smiling. Just as he had, emerging from his mother's womb. The swelling, subsided, and the wound healed with time. Soon, it was just a pink jagged line running up from his lip. By the following winter, it was only a faint scar. Which was ironic. Because that was the winter that Hassan stopped smiling."
Foreshadowing – Whole first chapter is foreshadowing, shows us that even though the book is in written as a flashback, we know that Amir will eventually return to Afghanistan to "be good again".
Chapter 5 Foreshadowing – Amir says, "marking the start of a still ongoing era of bloodletting", it foreshadows to how the war in Afghanistan will not end soon.