ضَارِبٌ خَالِدًا — ضَارِبُ خَالِدٍ
The governing indefinite form may retain tanwīn and take an accusative object. In annexation, the participle drops tanwīn and the following noun becomes genitive.
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Why Does Tanwīn Disappear?
Ism al-Fāʿil: Formation, Governance, Conditions and Time
ضَارِبٌ خَالِدًا — ضَارِبُ خَالِدٍ
The governing indefinite form may retain tanwīn and take an accusative object. In annexation, the participle drops tanwīn and the following noun becomes genitive.