What is the differences between the language you speak at home and the languages you use with friends, teachers, employers, and so on

You mean, in terms of things like word choice?

The way you talk at home or with friends is definitely going to be different than the way you talk at school or with an employer.

this could mean anything from you're more willing to swear or use slang around your friends.

Meanwhile, in a school or workplace, that is a formal, professional environment. You definitely wouldn't cuss in front of a teacher. You would use more eloquent vocabulary, be a little bit more refined with your language.

I don't know, that's what I think.

who is marty in this situation?

second one- because has facts and not opinion