hi !
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 !!!)
hope I helped !!!