Learn Spanish (Spain): Terminé el informe antes de que el jefe se diera cuenta. - I finished the report before the boss noticed.

Terminé el informe antes de que el jefe se diera cuenta.

I finished the report before the boss noticed.

Breakdown of Terminé el informe antes de que el jefe se diera cuenta.

el jefe

the boss (m)

terminar

to finish / to end up (in a state) / to quite manage (in negatives, + infinitive)

Questions & Answers about Terminé el informe antes de que el jefe se diera cuenta.

Why is diera in the subjunctive instead of the indicative?

The phrase antes de que (before) always requires the subjunctive in Spanish. It sets up an action that was pending or had not yet been realized from the perspective of the main verb.

Why do we use the imperfect subjunctive (diera) here rather than the present subjunctive?

This happens because of the sequence of tenses. Since the main action took place in the past (Terminé), the dependent verb following antes de que must also be in a past tense, which in this case is the imperfect subjunctive (diera).

Why is there a se before diera cuenta?

The verb used here is darse cuenta, a pronominal verb that means "to realize" or "to notice". You need the pronoun se to match el jefe. Without it, the phrase dar cuenta means "to report" or "to give an account of".

Could I just say antes de darse cuenta and drop the que?

Not in this sentence, because there is a change of subject. You finished the report, but the boss (el jefe) is the one noticing. You only use antes de followed by an infinitive when the subject is the same for both actions.