Going through unit two which introduces the perfect, pluperfect and future perfect, as well as the subjunctive, I just wanted to stop for a second and make sure I got the ideas right in my mind:
Sum nauta. I am a sailor.
Ero nauta. I will be a sailor.
Eram nauta. I used to be a sailor.
Fui nauta. I was a sailor.
Fueram nauta. I had been a sailor.
Fuero nauta. I will have ...