Introduction to the active participle – اِسْمُ الفاعِلِ   In Arabic, the noun used for the doer of an action (subject), is called اِسْمُ الفاعِلِ. It is formed by adding an alif – ا to the first radical of the verb فَعَلَ. The middle letter is given a kasrah -ِ and the last radical is given