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Not being under any obligation doesn't mean it is not a sensible a courteous way to do. You like it or not, english has become a defacto common international language. While I speak 5 languages and try to learn some basic words of the local languages of any country I visit out of courtesy (how to say hello, bye, thank you, ask where are the toilets, etc), I wouldn't expect any traveller to know enough to understand t…
Not nearly as much as people on the internet seem to think. In large parts of Europe, speaking english will get you absolutely nowhere.