زَيْدٌ قَائِمٌ أَبُوهُ.
Zaydun: nominative topic. Qāʾimun: nominative participial predicate. Abūhu: nominative agent of qāʾim (wāw sign of rafʿ for the six nouns), annexed to the pronoun.
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Parsing Qāʾimun Abūhu
Ism al-Fāʿil: Formation, Governance, Conditions and Time
زَيْدٌ قَائِمٌ أَبُوهُ.
Zaydun: nominative topic. Qāʾimun: nominative participial predicate. Abūhu: nominative agent of qāʾim (wāw sign of rafʿ for the six nouns), annexed to the pronoun.