Grammar Resources
Intermediate Spanish
Feedback & Correction
Spanish Si Clauses: The Three Conditional Patterns
The conditional never follows si. Each of the three condition types locks its two clauses into one fixed tense pair.
THE SHORT ANSWER
Si tendría is the error; pair tenses instead.
Each condition type locks one pair: si + present with future or present (real), si + imperfect subjunctive with conditional (hypothetical: si tuviera, viajaría), si + past perfect subjunctive with conditional perfect (counterfactual). The conditional never follows si itself, however close the English “if I would” feels. Como si takes only the subjunctive pairings, and the whether-si plays by different rules.
You can conjugate the imperfect subjunctive. You know tuviera and hubiera. And then you write a sentence about what you would do with more money, and out comes Si tendría más dinero, viajaría más, because in English “if I would have more money” sounds close enough to right.
Standard English does not put would in the if-half either, so this is not a structure English licenses and Spanish forbids. It is interference from how interchangeable the two halves feel when you are building a sentence at speed. Spanish is strict here. The conditional never appears after si. Neither does the future. Both belong in the result clause, and the Real Academia Española is blunt about it: prótasis introduced by si + conditional “no se consideran correctas.”
Spanish sorts conditional sentences into three types depending on whether the condition is likely, unlikely, or already impossible, and each type has a core tense pattern that gives you a reliable starting point. The table below also shows more than one possible result form in places, and mixed conditionals combine time frames, so treat these as the defaults you build from rather than the only legal combinations. The pairs give you a starting point for practice. You will still need to use them in your own sentences.
Type | After si (the condition) | In the result | What it means | Example |
|---|---|---|---|---|
Real / likely | present indicative | present, future, or imperative | possible, habitual, a general truth, an instruction | Si tienes tiempo, te llamaré. |
Hypothetical | imperfect subjunctive (-ra / -se) | simple conditional | unlikely, or contrary to how things are now | Si tuviera tiempo, viajaría más. |
Counterfactual | pluperfect subjunctive (hubiera + participle) | conditional perfect (habría + participle), or pluperfect subjunctive again | it did not happen; regret or reproach | Si hubiera sabido, habría venido. |
Mixed | imperfect or pluperfect subjunctive | conditional perfect or simple conditional | condition and result sit in different time frames | Si fuera más puntual, no habría perdido el vuelo. |
Type 1: the condition that might really happen
You may already use this pattern comfortably, though the future tense can still cause hesitation. Si takes the present indicative, and the result takes the present, the future, or an imperative.
The trap is the future. The condition frequently points at the future, and learners carry that future meaning into the si clause and produce si tendré. In Spanish the future lives only in the result: Si tengo tiempo, te llamaré.
CORRECTION
Si tendrás tiempo, te recomiendo visitar el museo.
Si tienes tiempo, te recomiendo visitar el museo.
The condition takes the present indicative even when it clearly points at the future. Si tendrás has no legitimate use here. Move any future meaning into the result clause instead.
The mirror-image slip is leaving the result in the present when the sentence is genuinely about what will happen. Si escuchas mis consejos, ganas más dinero states a general rule, the way Si vas al centro, siempre hay mucho tráfico does; for a specific future outcome you need ganarás. In Mexican and informal speech, ir a plus infinitive does the same job: Si llueve, vamos a quedarnos en casa.
The imperative belongs in this type too. Practise it, because instructions are where you will produce these sentences out loud most often: Si vas al tianguis del domingo, cómprame nopales frescos.
Both are frequent in written work. Use a comma when the si clause comes first, and no comma when it comes second: Si hace calor, vamos a la playa but Vamos a la playa si hace calor. And watch the accent, because si means “if” while sí means “yes”: writing Sí hace calor changes the sentence.
Type 2: the condition that is not true right now
The familiar error si tendría shows up in this pattern. Use the imperfect subjunctive after si and the simple conditional in the result.
CORRECTION
Si tendría más dinero, viajaría más.
Si tuviera más dinero, viajaría más.
Tendría is the conditional, and the conditional is not allowed after si. The condition takes the imperfect subjunctive (tuviera or tuviese), and the conditional stays where it belongs, in the result.
CORRECTION
Si yo sería rico, viajaría mucho.
Si yo fuera rico, viajaría mucho.
Same rule with ser. Sería is the conditional; fuera is the imperfect subjunctive. The set phrase for giving advice runs on this shape too: Si fuera tú, invertiría en bienes raíces.
It is also possible to get the condition right and hesitate over the result. Learners who have absorbed the subjunctive half sometimes leave the result in the present indicative:
CORRECTION
Si tuviera dinero, compro esa casa.
Si tuviera dinero, compraría esa casa.
The pair is locked at both ends. An imperfect subjunctive condition takes a conditional result, not a present one.
One more form to rule out. The present subjunctive never follows conditional si at all. Si tenga tiempo mañana is not a Spanish sentence; the correct version is Si tengo tiempo mañana, te llamo. If you are reaching for the subjunctive after si, it is the imperfect or the pluperfect, never the present.
The two sets of imperfect subjunctive endings
Type 2 and Type 3 both run on the subjunctive, so the form itself has to be solid before either pair will come out cleanly. It also has a feature that confuses learners the first time they meet it in print: two complete sets of endings that mean exactly the same thing.
-ra set | -se set | |
|---|---|---|
Endings | -ra, -ras, -ra, -ramos, -rais, -ran | -se, -ses, -se, -semos, -seis, -sen |
hablar | hablara | hablase |
decir | dijera | dijese |
poder | pudiera | pudiese |
Where you mostly meet it | the default everywhere, and strongly preferred in Latin American speech | Spain, and literary, formal, or older writing |
To build either one, take the third-person plural preterite, drop -ron, and add the endings: hablaron gives hablara, tuvieron gives tuviera, fueron gives fuera. Every preterite irregularity carries straight over, so the work you already did on irregular preterites is work you do not repeat here.
The two sets are grammatically equivalent, so you never have to choose between them on correctness grounds. Pick one and stay with it inside a single piece of writing, because switching at random reads as unsteady rather than as range.
Type 3: the condition that never happened
For a past condition that was not met, the pair moves up one step in both clauses. Si takes the pluperfect subjunctive (hubiera or hubiese + participle); the result takes the conditional perfect (habría + participle).
You can use this pair when you regret a decision or wish someone had acted differently. Si hubiera sabido que venías, habría preparado pozole. Si hubiéramos salido más temprano, habríamos evitado el tráfico del Periférico.
CORRECTION
Si habría sabido la verdad, no habría mentido.
Si hubiera sabido la verdad, no habría mentido.
Habría sabido is the conditional perfect, and the ban on the conditional after si covers its compound form too. The condition takes hubiera sabido; the result keeps habría mentido.
You may also hear a second pattern that looks different from the one you learned. Standard Spanish also accepts the pluperfect subjunctive in the result clause: Si hubieras venido, te hubiéramos invitado means the same as te habríamos invitado. Both are correct. Formal writing still tends to prefer the conditional perfect in the result, so that is the version to reach for on an exam.
The other thing to watch in this type is purely mechanical. The participle in a compound tense never agrees with anything:
CORRECTION
Si las hubieras vistas, te habrían gustado.
Si las hubieras visto, te habrían gustado.
After haber, the participle is invariable. The feminine plural object las has no effect on it. Agreement only appears when the participle is working as an adjective (las puertas están abiertas).
Mixed conditionals, and an important rule
Real conversation does not keep condition and result in the same time frame. You want to say that a standing fact about you caused a specific past outcome, or that something untrue about you now would change your plans tomorrow. That is a mixed conditional, and it is where most of your speculating in Spanish will happen.
Notice what does not change. Mixing time frames does not relax the rule: the clause after si is still subjunctive and still never conditional. Si sería más rico, habría comprado esa casa is wrong for the same reason every other version was, and Si fuera más rico fixes it. Only the result clause moves, here to the conditional perfect because the buying would have happened in the past.
Como si, and the si that is not a conditional
Two nearby constructions cause trouble because they look like the types above and behave differently.
Como si (“as if”) always takes the subjunctive, usually the imperfect, whatever tense the main verb is in, because it presents what follows as a comparison rather than asserting it as fact. Habla como si fuera un experto. Actuaba como si fuera el dueño del restaurante, pero solo era mesero. When the comparison points at an earlier situation, it takes the pluperfect subjunctive: Me miró como si hubiera visto un fantasma.
CORRECTION
Actúa como si tiene mucho dinero pero está endeudado.
Actúa como si tuviera mucho dinero pero está endeudado.
Como si presents what follows as a comparison rather than as a fact, so the indicative cannot follow it. The main verb staying in the present (actúa) makes no difference to the subjunctive after como si.
Then there is the family of fixed connectors that use si without following the three-type system: por si (acaso) for “in case” (Llévate un suéter por si llueve) and incluso si for “even if.” Si acaso exists too, but its meaning shifts with context, so when you specifically mean “just in case,” use por si acaso. Treat these as vocabulary, not as grammar to derive.
One last piece of interference to name: English “then.” If it rains, then we’ll stay home has no Spanish equivalent in the result clause. Si llueve, nos quedamos en casa. There is nothing to translate.
Quick tips to internalize
The conditional is barred from the si clause, in every type and in its compound form. It belongs in the result.
So is the future. Si tengo tiempo, te llamaré, never si tendré.
The present subjunctive never follows conditional si. If it is subjunctive, it is imperfect or pluperfect.
-ra and -se are interchangeable; pick one per text.
Como si takes the subjunctive regardless of the main verb’s tense: the imperfect normally, the pluperfect for an earlier situation.
Comma when si comes first, none when it comes second. And si has no accent.
Practice conditionals in situations you recognize
You can understand every row of the table and still say si tendría later in conversation. Recognizing a tense pair and choosing it while you speak take different kinds of practice. When you are negotiating, apologizing, or explaining what you would have done, you already have plenty to think about. It is easy to lose track of an ending.
Practice by making sentences with both halves and getting feedback on the tense you chose in each. On Dioma, Spanish prompts ask you to speculate, apologize, and reconsider decisions. These situations give you reasons to use the conditional types you might otherwise avoid. Put sería where fuera belongs and the correction names the pair you crossed and which half of the sentence each tense was supposed to sit in, while the sentence you meant is still in your head. The Spanish subjunctive guide covers the mood’s other triggers if the form itself is still shaky.
This week, pick the counterfactual type, the one with hubiera and habría, and write five sentences about decisions you did not make. Then say them out loud. Use decisions you would be comfortable talking about with someone, so you are practicing sentences you might use again.
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Frequently asked questions
Why can't you use the conditional after si in Spanish?
Because Spanish assigns the two halves of a conditional sentence different jobs and different tenses. The clause after si states the condition, and it takes the indicative or the subjunctive depending on type; the conditional expresses the outcome, so it lives only in the result. The RAE states directly that si + conditional is not considered correct. Standard English does not put would in the if-half either; the error comes from how interchangeable the two halves feel when you build the sentence at speed.
What is the difference between si tuviera and si hubiera tenido?
Si tuviera is a present-unreal condition: it is not true now, and its result takes the simple conditional (Si tuviera tiempo, viajaría). Si hubiera tenido is a past-unreal condition: it did not happen, and its result takes the conditional perfect (Si hubiera tenido tiempo, habría viajado). The first is a daydream, the second a regret.
Is -ra or -se correct for the Spanish imperfect subjunctive?
Both are correct and interchangeable. Hablara and hablase mean the same thing. The -ra forms are the default across the Spanish-speaking world and strongly dominant in Latin American speech; the -se forms are more common in Spain and in literary or formal writing. Choose one and stay consistent within a single text.
Does como si always take the subjunctive in Spanish?
Yes. Como si presents what follows as a comparison rather than as a fact, so it takes the imperfect subjunctive regardless of the main verb's tense (Habla como si fuera un experto), or the pluperfect subjunctive when the comparison is to something earlier (como si hubiera visto un fantasma). The indicative after como si is always an error.
Can the si clause come second in a Spanish sentence?
Yes, and the meaning does not change. Si tuviera tiempo, iría and Iría si tuviera tiempo are equivalent, as long as si stays attached to the condition verb. The only difference is punctuation: use a comma when the si clause comes first, and none when it comes second.
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