«أَبُوهُ قَائِمٌ» contains its own mubtadaʾ and khabar. As a unit it tells us about «زَيْدٌ», so it functions as a clausal predicate.
Do not flatten the structure by treating «قَائِمٌ» directly as Zayd’s predicate; it predicates standing of his father.
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Types of Khabar and the Linking Pronoun
«أَبُوهُ قَائِمٌ» contains its own mubtadaʾ and khabar. As a unit it tells us about «زَيْدٌ», so it functions as a clausal predicate.
Do not flatten the structure by treating «قَائِمٌ» directly as Zayd’s predicate; it predicates standing of his father.