مَرَرْتُ بِرَجُلَيْنِ.
Translation: I passed by two men.
The preposition bi makes rajulayni genitive. The form matches the accusative, but the grammatical cause differs.
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The Same Yāʾ Marks Genitive
The Dual Noun: Inflection, Maqṣūr, Mamdūd and Iḍāfah
مَرَرْتُ بِرَجُلَيْنِ.
Translation: I passed by two men.
The preposition bi makes rajulayni genitive. The form matches the accusative, but the grammatical cause differs.