When an explicit noun follows the verb as its subject, the verb remains singular in this construction even if the subject is dual or plural. Thus «ضَرَبَ» is singular in «ضَرَبَ الزَّيْدَانِ» and «ضَرَبَ الزَّيْدُونَ», while the explicit subjects themselves are dual and plural respectively.
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Why This Rule Matters
Rules of the Fāʿil: Explicit Nouns, Pronouns, Number and Gender
When an explicit noun follows the verb as its subject, the verb remains singular in this construction even if the subject is dual or plural. Thus «ضَرَبَ» is singular in «ضَرَبَ الزَّيْدَانِ» and «ضَرَبَ الزَّيْدُونَ», while the explicit subjects themselves are dual and plural respectively.