زَيْدٌ قَامَ
Zayd stood up.
زَيْدٌ أَبُوهُ قَائِمٌ
Zayd's father is standing.
In the first, the verb carries a concealed pronoun referring to the initial subject Zayd. The clause establishes the action and reinforces its attribution. In the second, the inner nominal clause is about Zayd's father; the possessive pronoun links that inner assertion back to Zayd.
ExpressionPredicate typePrimary rhetorical function
Zayd qāmaVerbal clauseStrengthened attribution
Zayd abūhu qāʾimNominal clauseRelated (sababī) predication