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Ok I can speak german but I'm not near Laax, but I can tell you that nearly everyone in Switzerland, Germany or Austria can speak good english.
I live in Austria and I know an English guy who's lived here for 20 years, he never speaks german apart from saying hello and bye and stuff like that, he has absolutely no problems because people can understand him.
So if you can't find anyone to teach you a bit, just speak english to people instead. They won't mind.
Good luck and have fun in Switzerland!