How often do Swiss people use other Swiss languages?

--- Send us your questions --- Switzerland has four national languages: German, French, Italian and Romansh. But how often do the Swiss use, or try to use, a language that's not their mother tongue? A trip to see the famous annual light projection at the Swiss Federal Palace, the Rendez-vous Bundesplatz, brings up the question as to how much the Swiss are expected to use Swiss languages other than their own in their daily life. We answer listener questions: - when are...