While the war hero was telling / told his story, the audience were listening / listen attentively.
While the war hero was telling / told his story, the audience were listening / listen attentively.
was telling: hành động đang diễn ra (kể chuyện).
were listening: hành động đồng thời đang diễn ra (nghe).
Dịch: Khi người anh hùng chiến tranh đang kể chuyện, khán giả đang chăm chú lắng nghe.