You would use vous, since M. Bernard means Mr. Bernard, and is formal. Generally if you're addressing someone as "Mme." "M." or "Mlle.", it's formal.
Answer:
(behind) is translated to derriére (in) should be translated to dans (on) should be translated to sur and (the woman went downtown) should be la femne est allée au centre-ville i dont know for sure but i think this is the translations
Bonjour,
Ce week-end je vais au concert.
Have a good day ! :-)
