This is just to bring the future subjunctive altogether. Before writing your answer, first think about whether the situation is certain (you don’t use the future subjunctive) or if it’s not (you do use it).
Let’s try some examples.
Now, speak informally.
Let’s now see somebody talking about his dreams. A doctor is médico and you do not say I am a doctor but you say I am doctor in Portuguese.
Finally, imagine you are talking to a group of close friends.
That’s it for future subjunctive. Have fun. :)