"пока не умру" means "as long as I'm alive" (lit. "as long as I'm not dead") Я буду любить тебя, пока не умру. = I will love you for as long as I'm alive. "перед смертью" is "before one's death" (i.e. prior to the exact moment of death) Перед смертью я хочу проститься со всеми друзьями. = Before my death I want to say goodbye to all my friends. "прежде чем умру" is more like "before I die" but in a sense of a longer time before death (maybe many years) Я хочу посетить 100 стран прежде чем умру. = I want to visit 100 countries before I die.

I would translate it this way. Пока не умру - until the day I die. Перед смертью - before dying. Прежде чем умру - before I die. Examples 1. I will love you until the day I die. 2.There is a song "A kiss before dying " 3.I want to see the sun, before I die. So, it means almost the same. You are free to choose, wich you like.

Перед смертью - قبل الموت Прежде чем умру - قبل ما اموت اما بالنسبة للجملة Пока не умру لها اكتر من معنى ممكن تكتبين السياق كله؟