In ENGLISH, the use of conjunctions in compound sentences will NEVER utilize the subjunctive.

I’ll take my umbrella in case it rains.

But in SPANISH, they are followed by the SUBJUNCTIVE.

Traeré mi paraguas en caso de que llueva.

Always use the subjunctive after the following conjunctions because they express doubt or uncertainty about whether or not the events in the second part of the sentence will happen.

a fin de que a menos que antes de que con tal de que en caso de que

para que

sin que

so that unless before provided that in case that

(in the event that) so that

(in order that) without

No gastes tus ahorros a menos que sea necesario.

Don’t spend your savings unless it’s necessary.

Voy a imprimir las fotos para que todos las miren.

I’m going to print the photos so that everyone can look at them.

Conjunctions without “que” = indicative

Tendrás que comer antes de que salgas.

Tendrás que comer antes de salir.