Heritage speakers understand everything but can't speak. Textbook learners can explain grammar but freeze in conversation. The reason is the same: comprehension and production, knowledge and skill, live in separate systems.
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Every three-year-old on Earth masters a language through statistical learning, pattern extraction, and implicit grammar building. That same mechanism is still running in your adult brain.
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Your mouth has spent decades optimizing for your native language. Speaking a new one means training new motor patterns, and that training looks more like learning an instrument than learning facts.
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