Years back I was planning a trip to Germany. I picked up some old Berlitz tapes and got to work listening to them. I had a Korean friend, married to a German firefighter and she spoke Emglish. He didn't. I found she had never studied English in Korea, learned what she knew during a 24 hour lay over in Alaska. My German was foul, so I never got good at it. I loaned the tapes to a young guy and his bride who had taken a job in Germany and he became quite fluent, with out realizing the tapes were quite old. Words like "gnediga frau" were from before the war, not even recognized by some of the younger folks where he worked.Languages do change with time. The uncle that raised me spoke gaelic at home in Scotland, but I never remember him having an accent, tho' I know he did. It was just how he spoke all my life. I would go to the sheep camps sometimes for a few days with Irish folks and pick up an Irish accent. Kids in Calif. schools never could figure where I was from, France, Scotland or Ireland, tho' most guessed I was Irish. Found out that is mostly true, tho' I have yet to go there.