Translation of "تفعلهُ" in English

وقد تكونُ مُنهمكاً ومُنخرطاً بما تفعلهُ

and you might even be so absorbed and engaged in what you're doing

الماضي هو الماضي. لا يوجد شىء تفعلهُ حيال ذلك.

The past is the past. There's nothing you can do about it.