grammar.clauses.purpose-para-que
Para que + subjunctive: so that
Purpose with a different subject takes para que + subjunctive: te lo explico para que entiendas. Same subject: para + infinitive (estudio para aprender).
grammarB1v0.1.0
Explication
The split is mechanical: one subject → para + infinitive (vine para ayudar); two subjects → para que + subjunctive (vine para que me ayudes).
Cousins behave the same: a fin de que, con tal de que (provided that), sin que (without), antes de que — all subjunctive with subject change, infinitive without.
Exemples
Lo anoté para que no se me olvide.
I wrote it down so I don't forget.
I wrote it down so I don't forget.
Région: global
Salí sin que nadie me viera.
I left without anyone seeing me.
I left without anyone seeing me.
Région: global