Think about this very seriously for a moment. If you have children, just think what degree of spoken fluency your child had when you first packed him off to first grade. Think of all he could understand and say before he ever started his formal education. When your child was 6 years old, he or she had already achieved a high degree of spoken fluency and you didnt have to enroll him in a Total Immersion course in order for him to achieve fluency. He could understand and use prepositions and other parts of speech long before he ever learned what a part of speech even was.
Long before learning what the names of the parts of speech were, he learned to ride the horse. He achieved spoken fluency. Then, once a high degree of spoken fluency was achieved, he hooked that horse up to the cart. He learned formal grammar.
This is why traditionally-taught foreign language courses do not work to give you a high degree of spoken fluency. It is because they put the cart (traditionally-taught grammar) before the horse (high degree of spoken fluency in the target language). The horse pulls the cart. The cart is inert and lifeless alone. It cannot move without the horse.
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