الزَّيْدَانِ ضَرَبَا — The two Zayds struck. الزَّيْدَانِ is a nominative dual mubtadaʾ marked by alif. ضَرَبَا is a past verb; its dual alif is an attached pronoun functioning as the subject. The verbal clause is the predicate. Dual agreement appears because the subject is a pronoun.
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Dual: The Two Zayds Struck
Rules of the Fāʿil: Explicit Nouns, Pronouns, Number and Gender
الزَّيْدَانِ ضَرَبَا — The two Zayds struck. الزَّيْدَانِ is a nominative dual mubtadaʾ marked by alif. ضَرَبَا is a past verb; its dual alif is an attached pronoun functioning as the subject. The verbal clause is the predicate. Dual agreement appears because the subject is a pronoun.