I have come to the conclusion that most so-called "learning disabilities" are actually gaps in education. If a student is socially promoted without necessary skills, s/he flounders in subsequent grades. This is usually identified as a learning disability, because admitting previous education was inadequate is not in keeping with the narcissism of educational institutions. Further, the theories about why formal Grammar is unnecessary are very seductive. These arguments are believable, because most people with good mastery of Grammar don't directly call from their knowledge very often. Their mastery seems intuitive, and so it's hard to prove that the formal Grammar lessons were necessary, or even helpful. I bought into those theories myself, and taught without formal Grammar in our second home-school year. It didn't work out. I personally recommend "Cozy Grammar" to anyone who missed the boat on Grammar. It's very, very effective. It works for ESL, and it works for young and old. Marie Rackham uses multiple modes to convey Grammar. While her exercises seem simple, each builds upon the last. http://www.splashesfromtheriver.com/sample_lesson.htm These materials are a bit pricey up front, but the workbooks are black-line reproducible Adobe files. Home schooling swap sites and state annual home schooling convention used material sales offer perfectly good "gently used" sets at substantially reduced prices. E-bay, not so much. They've started to really gouge on used educational materials.