Good lord, I don't know. I am a truly gifted monolinguist. Studied Greek and Latin roots in grade school... Spanish in high school and college... it has given me great facility in English but no abilities at all in any other language.
I studied Latin in 8th grade, but don't remember a thing, other than a few trite expressions "ite missa est."
I studied one year of Spanish in high school and for the most part I learned it on my own. Forgot a lot of vocabulary, though, as I no longer get to practice it. Still have no probs with verb conjugations. It's just that my memory is failing me.