Answer :
Final answer:
Amy Tan explores the significance of mother tongue in one's identity and expression through her personal experiences with her mother's English.
Explanation:
Amy Tan builds the central idea of her story in the excerpt by discussing her mother's English to support the idea that the language of one's childhood is a person's deepest, truest form of expression. Tan contrasts how her friends perceive her mother's English with her own view, highlighting the unique and personal connection to one's native language.
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