Final answer:
In the given excerpt, Tan builds the central idea that the language of one's childhood is a person's deepest, truest form of expression, through her discussion of her mother's English.
Step-by-step explanation:
Tan discusses her mother's English to support the idea that the language of one's childhood is a person's deepest, truest form of expression. Through the excerpt, Tan expresses that while her friends may struggle to understand her mother's nonstandard form of English, she sees it as perfectly clear and natural. She highlights that her mother's language shaped her understanding of the world and allowed her to express herself.
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