I've been learning Czech for years.  I've taken classes, done exercises in the books, made lists, and engaged in informal group lessons with people who just want to better their Czech.
My Czech is abysmal.  Every year I come to Prague and and speak the language--badly.  I confuse the declensions.  I get genders wrong (I mean, four genders?  really?).  I now have a slender acquaintance with akusitive, which will disappear almost completely unless I find a way to pr...