Unconscious awareness may take the form of unformulated expectations about the language you're learning, such as that it will distinguish between present and past. As your contact with the language increases, these expectations grow and develop, becoming more complex and more refined. We are less accustomed to exploiting the vast potential for positive transfer in a conscious and systematic manner. Well, if we've got passive grammar, let's use it. In fact, as teachers, we already do so, though usually implicitly.
Any spiral syllabus recognises it.
The Total Physical Response turns it into a method. All multiple choice questions designed as grammar tests rely on it entirely. Attempts to develop reading and listening as skills draw up on it. Michaela has developed a type of exercise for use at the University of Architecture, Civil Engineering and Geodesy in Sofia which makes use of it. She explains the role of auxiliary verbs in question formation, then asks her students to form questions using tenses they have not been presented with.