I have been learning the subjunctive and all resources I have looked at, suggested that "the future subjunctive points toward a time ahead and implies realistic expectations".
But then I came across an example of
"If I win the lottery, I will build a mansion => Se eu ganhar na loteria, vou construir uma mansão"
Surely this isnt entirely right given the lottery has a chance of 1 in 50m or so that one can win. So Im just wondering, is the idea that the future subjunctive pertains to likely scenarios untrue? And that it should b:
"se ganhasse na loteria, construiria uma mansão?"