когда мы пришли,он уже вернулся и ч

когда мы пришли,он уже вернулся и что-то писал в своём кабинете

Результаты (английский) 1:

When we arrived, he had already returned and wrote something in his Office

Результаты (английский) 2:

When we arrived, he had already returned and was writing in his office

Результаты (английский) 3:

when we arrived, he had already come back, and then wrote in his office