The main reason the author includes Aiden's memories of Ms. Erdon's English class is: To illustrate his past experiences with overcoming challenges.
In the story, "The Diving Board," we learned of how Aiden was filled with terror when he got into Ms. Erdon's English class. He was more terrified when they were assigned to speak.
However, he motivated himself and eventually gave the speech successfully. This illustrates the fact that Aiden overcame challenges in the past.
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