Final answer:
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.
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. She describes how her friends have different levels of understanding of her mother's English but for her, it is perfectly clear and natural. The language she grew up with helped shape her perception of the world.
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