That has been my experience too. I was always an average foreign language student, until I started to learn German living in Berlin and to speak English at wor

That has been my experience too. I was always an average foreign language student, until I started to learn German living in Berlin and to speak English at work. Now I'm fluent in both languages. I forgot most of the German rules I learned during my first months in Berlin taking crash courses. I just know sentence structures because I heard them and used them so often. Like a child, really.