"Marcus is a man."
Translation:Marcus est vir.
We are saying that Marcus is an adult male (vir), not that he is a human being (homine).
I know it's early and this is beta, but scanning the course I note that none of the cases are mentioned. I'm just glad you added Latin as I've always had a great interest in it. Will you eventually be adding cases, like the Dative, Accusative, etc." I honestly would like to know--and thanks again for the course. I've waited a long time for it. (As you can note! ;) )