"Bien que Mateo sache déjà ce qu'il allait étudier à l'université," / "Although Mateo already knew what he was going to study at university,"
For this sentence I used the subjunctive past tense ""Bien que Mateo ait déjà su ce qu'il allait étudier à l'université," which is obviously not correct, but please can someone explain why? I assume it's because him knowing is not a single event in the past so the present subjunctive is the only alternative?
Nick