<em>Bonjour,</em>
<em>1. On "veux" (vouloir)acheter du vin, mais on "doit"(devoir) avoir 21 ans.</em>
Hi,
Les bonbons sont des aliments peu nutritifs.
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:
non , ils ne le regardent pas