Se fue antes de que llegaras.

Questions & Answers about Se fue antes de que llegaras.

Why is it se fue instead of just fue?
The verb here is irse (to leave), not just ir (to go). While fue alone would mean he went somewhere specific or he was, adding the pronoun se changes the meaning entirely to leaving or going away.
Why does antes de que trigger the subjunctive verb llegaras?
The phrase antes de que (before) always forces the next verb into the subjunctive mood. This is because the second action (your arriving) is viewed as an anticipated event that had not yet happened at the time of the first action (his leaving).
Why is llegaras in the past (imperfect) subjunctive instead of the present subjunctive?
The tense of the subjunctive verb has to match the timeframe of the main sentence. Since the main action happened in the past (se fue), you must use the past version of the subjunctive (the imperfect subjunctive) to keep the timeline consistent.
Could I just say antes de llegar instead of antes de que llegaras?
Not in this case, because there are two different subjects: he left, and you arrived. You can only drop the que and use the infinitive (antes de llegar) when the same person performs both actions, such as if he left before he himself arrived.

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