The Subjunctive in Time Clauses: cuando llegue, antes de que

Spanish: El subjuntivo en oraciones temporales: cuando llegue, antes de que

Level: B2 Upper-Intermediate

Category: subjunctive

Explanation

Time clauses tell us when the action of the main verb takes place. In Spanish, we use the subjunctive in these clauses when we refer to a future or not-yet-realized moment. Conjunctions such as cuando (when), en cuanto (as soon as), tan pronto como (as soon as), hasta que (until), mientras (while), and después de que (after) can be followed by either the subjunctive or the indicative, depending on context. The fundamental rule is this: if the time action refers to the future (something that has not happened yet), we use the present subjunctive. For example: "Cuando llegues al hotel, llámame" (Call me when you arrive at the hotel — the arrival has not happened yet). On the other hand, if we talk about something habitual or already past, we use the indicative: "Cuando llego al hotel, siempre llamo" (When I arrive at the hotel, I always call — a habitual action). The conjunction "antes de que" (before) is special: it is ALWAYS followed by the subjunctive, without exception, because by definition it refers to an action that has not yet occurred relative to the other. For example: "Quiero pagar antes de que cierre el banco" (I want to pay before the bank closes). The same happens with phrases expressing purpose or anticipation. Mastering this usage is essential at the B2 level, because it appears constantly in everyday conversations: making plans, giving instructions, expressing future conditions. Distinguishing between the indicative (facts, habits, past) and the subjunctive (future, hypothesis) is the key to sounding natural in Spanish.

Examples

• Cuando llegues al hotel, llama a la recepcion. - When you arrive at the hotel, call the reception.
• En cuanto abra el banco, voy a cambiar dinero. - As soon as the bank opens, I am going to exchange money.
• Quiero pagar antes de que cierre la tienda. - I want to pay before the shop closes.
• Espera aqui hasta que venga el camarero. - Wait here until the waiter comes.
• Tan pronto como tengamos las entradas, entramos al museo. - As soon as we have the tickets, we go into the museum.