The Fourth R by George O. Smith

Once James progressed Martha through the little dictionary, he began with a book of grammar. Again it started slowly; he had to spend quite a bit of time explaining to Martha that she did indeed know all of the terms used in the book of grammar because they'd all been defined by the dictionary, now she was going to learn how the terms and their definitions were used.

James was on more familiar ground now. James, like Martha, had learned his first halting sentence structure by mimicking his parents, but he remembered the process of learning why and how sentences are constructed according to the rules, and how the rules are used rather than intuition in forming sentences.