The active participle follows the فَاعِلٌ pattern, adjusted for a weak-final yāʾ. In the indefinite masculine nominative singular, the weak ending produces رَامٍ. The yāʾ is visible again in the dual رَامِيَانِ.
The passive participle follows مَفْعُولٌ; its wāw interacts with the root-final yāʾ, producing yāʾ substitution and assimilation. The result is the geminated مَرْمِيٌّ. These different patterns account for the different meanings as well.
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How رَامٍ and مَرْمِيٌّ Are Formed
Full Conjugation of the Yāʾ-Final Verb رَمَى يَرْمِي
The active participle follows the فَاعِلٌ pattern, adjusted for a weak-final yāʾ. In the indefinite masculine nominative singular, the weak ending produces رَامٍ. The yāʾ is visible again in the dual رَامِيَانِ.
The passive participle follows مَفْعُولٌ; its wāw interacts with the root-final yāʾ, producing yāʾ substitution and assimilation. The result is the geminated مَرْمِيٌّ. These different patterns account for the different meanings as well.