Adverbial Clauses | Spanish (Latin America) Grammar

An adverbial clause is a subordinate clause that modifies the main verb the way an adverb does — it tells you when, why, for what purpose, under what condition, or with what result something happens. These clauses are introduced by conjunctions like cuando, porque, para que, aunque, and si.

Adverbial clauses are essential for building connected, expressive Spanish. They also provide one of the most systematic environments for the indicative/subjunctive contrast.

Causal Clauses — Why

Causal clauses explain the reason for the action in the main clause. The most common conjunction is porque (because).

No fui porque estaba enfermo.

I didn't go because I was sick.

Como no tenía plata, me quedé en casa.

Since I didn't have money, I stayed home.

Como (since) is another causal conjunction, but it must come before the main clause. Me quedé en casa como no tenía plata sounds unnatural — como leads the sentence.

Other causal conjunctions: ya que (since, given that), puesto que (given that), dado que (given that).

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Causal clauses almost always use the indicative because the reason is a real, factual event. The one exception is no porque + subjunctive, which denies a reason: No lo hizo porque quisiera, sino porque debía (He didn't do it because he wanted to, but because he had to).

Temporal Clauses — When

Temporal clauses tell you when the main action happens. The conjunction cuando (when) is the most frequent.

Cuando llegué, ya se habían ido.

When I arrived, they had already left.

Cuando llegue Juan, empezamos.

When Juan arrives, we'll start.

The mood depends on whether the event is real or future/hypothetical:

Indicative for habitual or past events: Cuando llego, siempre saludo.
Subjunctive for future events: Cuando llegue, te aviso.

Other temporal conjunctions:

Conjunction	Meaning	Typical Mood
cuando	when	indicative (past/habit), subjunctive (future)
mientras	while	indicative (past/habit), subjunctive (future)
antes de que	before	always subjunctive
después de que	after	indicative (past), subjunctive (future)
hasta que	until	indicative (past), subjunctive (future)
en cuanto / tan pronto como	as soon as	indicative (past), subjunctive (future)
desde que	since (time)	indicative

Mientras dormías, llegó un paquete.

While you were sleeping, a package arrived.

Antes de que salgas, cerrá la ventana.

Before you leave, close the window.

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Antes de que always takes the subjunctive — no exceptions. The event after before hasn't happened yet, so it's always non-real from the speaker's perspective.

Purpose Clauses — What For

Purpose clauses express the goal of the main action. The main conjunction is para que (so that, in order that).

Hablo despacio para que me entiendan.

I speak slowly so that they understand me.

Te lo digo para que sepas.

I'm telling you so that you know.

Purpose clauses always take the subjunctive because the goal is something desired but not yet achieved.

When the subject of both clauses is the same, Spanish uses para + infinitive instead of para que + subjunctive.

Estudio para aprender.

I study in order to learn.

Compare: Estudio para que mis hijos aprendan (different subjects — full clause needed).

Concessive Clauses — Even Though

Concessive clauses acknowledge a circumstance that might be expected to prevent the main action, but doesn't. The key conjunction is aunque (although, even though, even if).

Aunque llueve, vamos a salir.

Even though it's raining, we're going out.

Aunque llueva, vamos a salir.

Even if it rains, we're going out.

The mood makes a real difference here:

Indicative (llueve): the rain is a fact — it IS raining, but we're going anyway.
Subjunctive (llueva): the rain is hypothetical — even IF it rains, we'd still go.

Aunque no me creas, es verdad.

Even if you don't believe me, it's true.

Conditional Clauses — If

Conditional clauses state a condition for the main action. The conjunction is si (if).

Si tenés tiempo, llamame.

If you have time, call me.

Si tuviera plata, viajaría.

If I had money, I would travel.

Si hubiera sabido, te habría ayudado.

If I had known, I would have helped you.

The mood depends on the type of condition:

Real/possible → present indicative: Si llueve, no salimos.
Unreal/hypothetical → imperfect subjunctive: Si lloviera, no saldríamos.
Contrary-to-fact past → pluperfect subjunctive: Si hubiera llovido, no habríamos salido.

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Spanish never uses the present subjunctive after si for standard conditions. Si tenga is ungrammatical. Use indicative for real conditions and imperfect subjunctive for unreal ones.

Result Clauses — So / Therefore

Result clauses express the consequence of the main action. Common connectors include así que (so), de modo que (so that), and por eso (that's why).

Llovió mucho, así que nos quedamos en casa.

It rained a lot, so we stayed home.

No había boletos, de modo que volvimos.

There were no tickets, so we came back.

Estaba cansado, por eso me fui temprano.

I was tired, that's why I left early.

Result clauses use the indicative because the result is a real, accomplished fact. However, when de modo que or de manera que express purpose (rather than result), they take the subjunctive: Habla de modo que todos entiendan (Speak so that everyone understands).

Place and Manner Clauses

Two less commonly discussed types of adverbial clauses deserve mention.

Place clauses with donde tell you where the action happens:

Vamos donde vos quieras.

Let's go wherever you want.

Manner clauses with como tell you how the action is done:

Hacelo como te parezca mejor.

Do it however seems best to you.

Both use the subjunctive when the location or manner is unknown or open-ended, and the indicative when it's specific and known.

Summary Table: Conjunction, Meaning, and Mood

Type	Key Conjunctions	Mood
Causal	porque, como, ya que, dado que	indicative
Temporal	cuando, mientras, hasta que, en cuanto	indicative (past/habit) or subjunctive (future)
Temporal	antes de que	always subjunctive
Purpose	para que, a fin de que	always subjunctive
Concessive	aunque	indicative (fact) or subjunctive (hypothetical)
Conditional	si	indicative (real) or imperfect subjunctive (unreal)
Result	así que, de modo que, por eso	indicative

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Three conjunctions that always require the subjunctive: para que, antes de que, sin que. Memorize these — they never waver. Everything else depends on context.

Where to Go Next

To see how adverbial clauses fit into the larger picture of subordination, review Subordinate Clauses Overview. For practical techniques on turning simple sentences into complex ones using these clause types, continue to Sentence Combining Strategies. For the full treatment of mood choice, see Subjunctive vs. Indicative.