الرَّجُلَانِ ضُرِبَا — The two men were struck.
الرَّجُلَانِ: nominative topic (mubtadaʾ), marked by alif.
ضُرِبَا: past passive verb; attached dual alif pronoun is the passive subject in the verb phrase, which is the predicate.
Contrast: ضُرِبَ الرَّجُلَانِ has an overt dual passive subject after a singular verb.
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Mafʿūl Mā Lam Yusamma Fāʿiluhu — The Passive Subject
الرَّجُلَانِ ضُرِبَا — The two men were struck.
الرَّجُلَانِ: nominative topic (mubtadaʾ), marked by alif.
ضُرِبَا: past passive verb; attached dual alif pronoun is the passive subject in the verb phrase, which is the predicate.
Contrast: ضُرِبَ الرَّجُلَانِ has an overt dual passive subject after a singular verb.