Conjunciones de subordinación
Subordinating conjunctions join dependent (subordinate) clauses to main clauses. You can recognize a dependent clause by the fact that it cannot stand alone – its meaning is incomplete without the main clause.
Por ejemplo …
Dije que estoy ocupado. – I said that I am busy.
The main clause is I said. What did I say? That I am busy. "I am busy" is incomplete without "I said." I might not in fact be busy, but I said that I was.
Como no tengo dinero, no puedo ir. – Since I don’t have any money, I can’t go.
The main clause is I can’t go. Why can’t I go? Because I don’t have any money. The idea here is not that I don’t want to go, but the fact that I can’t go since I don’t have any money.
Te lo diré cuando nos veamos. – I will tell you when I see you.
The main clause is I will tell you. When will I tell you? When I see you. So "I will tell you" is incomplete without the juxtaposition "when I see you."
Spanish subordinating conjunctions
|a condición de que||on the condition that|
|a fin de que||so that|
|a menos que||unless|
|antes (de) que||before|
|bien que||even though|
|con tal (de) que||provided that, as long as|
|en caso de que||in case|
|en vista de que||in view of the fact htat|
|mientras que||provided that, as long as|
|para que||so that|
|por miedo de que||for fear that|
|siempre que||provided that, as long as|
|tan pronto como||as soon as|
Note that many of these conjunctions must be followed by the subjunctive.