That's exactly true, and it's the point that I was getting at. If you want to learn a language properly then going to one or two classes a week is not going to do anything for you. So when they complain about their lack of English, and how English is "too difficult", I want to tell them that their way of learning is flawed, and they shouldn't really expect too much. If all they want to do is have it as a hobby, then fine, but for those students who say "I wanting to use English at jobu" then they might want to reconsider.
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