هُوَ ضَارِبُ زَيْدٍ
Translation: He is the one striking Zayd.
هُوَ: mubtadaʾ.
ضَارِبُ: nominative khabar, also the mudāf.
زَيْدٍ: genitive mudāf ilayh, semantically the participle’s object.
To illustrate the uncombined sense, compare هُوَ ضَارِبٌ زَيْدًا where participial governance is licensed: Zaydan is now a direct object in the accusative, whereas in the construct it is genitive.
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Al-Majrūrāt — Semantic and Formal Iḍāfah
هُوَ ضَارِبُ زَيْدٍ
Translation: He is the one striking Zayd.
هُوَ: mubtadaʾ.
ضَارِبُ: nominative khabar, also the mudāf.
زَيْدٍ: genitive mudāf ilayh, semantically the participle’s object.
To illustrate the uncombined sense, compare هُوَ ضَارِبٌ زَيْدًا where participial governance is licensed: Zaydan is now a direct object in the accusative, whereas in the construct it is genitive.