Does it happen to you too?
Before starting English Duolingo's course, I knew a lot ( maybe) about English terms and usual sentences ( Duolingo says me I know about 1380 word but I think to know more and more ). I finished yesterday the course and when I use Immersion method and I see a lot about topics, I also see the hard terms that are used to describe that topic that often you've never seen before a course..
.. and when you meet a thing like that, immediately go out from Immersion and want to improve more english as you think you know ahaha
( strange terms or sentences... xD)