Mindegyik helyes (angol)?

1. helyes,de így is jó: I still regret that i didn't study at university. (amúgy az 'at' helyett during jobb)

2. I don't know if I regret not having studied during university. / I'm not sure that I was wrong when I didn't study at university. / I might regret that I didn't study at university.

3. ha halott vagy,akkor nincsenek önáló gondolataid,és beszélni sem tudsz.

Egyébként: I regret wasting my time on doing superfluous things not studying during university. (....nem tanulva)