Answer:
Vous
Step-by-step explanation:
Vous is used for formal circumstances, like with your teacher.
Tu is used for people you are familiar with, and want to get to know.
Je means I, which you don't use when you are adressing someone else.
Most likely Vous
Explanation: Vous is you all, but it can also be used as a formal you (singular). If you are talking in a unformal fashion, you would use Tu (informal you)
4.6m questions
5.9m answers