I was just wondering about this today, how to tell when to use the subjunctive or the future. Both have this element of uncertainly - to a certain degree - haven't happened as yet and both deal with maybes, etc. The future is never really set in stone.
For example : I will go out when the sun shines. I think that in Spanish this could be said in either future or subjunctive, i.e.:
Saldré cuando brille el sol.
Saldré cuando brillará el sol.
Can you help me better understand this.