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Together with the noun "ball" I teach him the verbs "roll," "throw" and "drop," and perhaps an adverb or two like "fast" or "slowly," and an adjective, "round." Sometimes there is an awkward hitch and I have to abandon the attempt to teach him some particular word, referring to it again when his vocabulary has been increased in some other direction.
A certain point once passed, it was surprising with what rapidity I proceeded. One word led to
