زَيْدٌ ضُرِبَ — Zayd was struck.
زَيْدٌ: nominative mubtadaʾ (topic).
ضُرِبَ: past passive with an implicit passive-subject pronoun «هُوَ» referring to Zayd; verbal sentence is the predicate.
By contrast, in ضُرِبَ زَيْدٌ, the overt Zayd is himself the passive subject. Similar meaning does not require identical syntactic analysis.
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Mafʿūl Mā Lam Yusamma Fāʿiluhu — The Passive Subject
زَيْدٌ ضُرِبَ — Zayd was struck.
زَيْدٌ: nominative mubtadaʾ (topic).
ضُرِبَ: past passive with an implicit passive-subject pronoun «هُوَ» referring to Zayd; verbal sentence is the predicate.
By contrast, in ضُرِبَ زَيْدٌ, the overt Zayd is himself the passive subject. Similar meaning does not require identical syntactic analysis.