LessonsAl-Murakkabāt — Compound Numerals, the Twelve Exception and Declining BaalbekQuiz

رَأَيْتُ اثْنَيْ عَشَرَ طَالِبًا — I saw twelve students.
رَأَيْتُ: past verb plus the subject pronoun.
اثْنَيْ: accusative direct object marked by yāʾ on the dual pattern.
عَشَرَ: second part, fixed on fatḥ.
طَالِبًا: accusative tamyīz.

The shift اثْنَا → اثْنَيْ follows the governing syntax; it is not an arbitrary alternate spelling.

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Twelve in the accusative

Al-Murakkabāt — Compound Numerals, the Twelve Exception and Declining Baalbek

رَأَيْتُ اثْنَيْ عَشَرَ طَالِبًا — I saw twelve students.
رَأَيْتُ: past verb plus the subject pronoun.
اثْنَيْ: accusative direct object marked by yāʾ on the dual pattern.
عَشَرَ: second part, fixed on fatḥ.
طَالِبًا: accusative tamyīz.

The shift اثْنَا → اثْنَيْ follows the governing syntax; it is not an arbitrary alternate spelling.