Я изучал его в свободное время, ког

Я изучал его в свободное время, когда учился в военном институте

Результаты (английский) 1:

I studied it in his spare time, when he studied at a military Institute

Результаты (английский) 2:

I studied it in their spare time, when he was in military institute

Результаты (английский) 3:

I have studied it in their free time, when he was in the military institute