I agree with Przemol. Besides French and English, I can also speak a bit of German and have notions in Italian and Spanish. I also heard a lot of Polish in my family during my youth. You here may have the feeling that all Europeans are "polyglots" but people who can only speak their native tongue (apart from British of course) just won't sign up on an international english-speaking forum...
But to tell the truth, we tend more and more to use English as a vehicular language. That is, a language which is not native for both speakers but which they both understand. In the past and particularly during Middle Age, the european vehicular language was Latin, although it wasn't anyone native language any longer. This is why it left traces in almost all current european languages.