# Real conditions: si tengo tiempo, voy

> id: grammar.clauses.si-real · category: grammar · depth: standard · levels: B1 · review: internally_reviewed

**Summary.** Open conditions use si + present indicative, with present, future, or imperative in the main clause: si llueve, no salimos; si puedes, llámame.

Open, realistic conditions — things that may well happen — use si + present indicative in the if-clause, with the present, the future, or a command in the main clause: si llueve, no salimos; si firmas hoy, empezamos el lunes; si puedes, llámame.

A firm rule: never use the present subjunctive right after si. *Si tengas, *si vengas are impossible — it's si tengo, si vienes. (The subjunctive does appear in conditions, but only the imperfect/pluperfect kind, for unreal situations — the next rules.)

Si + a past indicative checks a real past fact, often to draw a conclusion: si lo dijo, fue por algo ('if he said it, there was a reason'). For hypothetical or contrary-to-fact conditions, the imperfect subjunctive + conditional takes over.

## Examples
- Si el precio baja, compramos. — If the price drops, we buy.
- Si ves a Marco, avisale. — If you see Marco, let him know.
- Si el precio baja esta semana, compramos. — If the price drops this week, we'll buy.

Related: grammar.clauses.si-hypothetical, grammar.clauses.si-past-unreal

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