1) Would you use "tu" or "vous" with the following persons
2- Mr Bernard = vous 3- Melle Fournier = vous 4- Thomas = tu 5- Sylvain = tu 6- Doctor Martin = vous 7- Sylvain = tu 8- Marie-France = tu
Usually when you call s.o by his first name, it's s.o you're friend with, so you call him "tu". If you call him by his last name, his surname, it's a person you know less; so it's "vous" (it's a question of courtesy like the Usted and Ustedes in Spanish if you ever study it !!!)