● The case of a dual noun is not shown by vowel marks such as fatḥah, kasrah, and ḍammah, as with singular nouns. It is shown by changing the final letters and sounds:
○ nominative: ends in ـَانِ (alif preceded by fatḥah and nūn with kasrah), as in رَجُلَانِ (two men).
○ accusative and genitive: end in ـَيْنِ (a letter with fatḥah, sākin yāʾ, and nūn with kasrah), as in رَجُلَيْنِ.
● Important point: The accusative and genitive dual forms are exactly the same in form and sound.
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Case-Ending Rule for the Dual
Grammatical Case of Dual Nouns
● The case of a dual noun is not shown by vowel marks such as fatḥah, kasrah, and ḍammah, as with singular nouns. It is shown by changing the final letters and sounds:
○ nominative: ends in ـَانِ (alif preceded by fatḥah and nūn with kasrah), as in رَجُلَانِ (two men).
○ accusative and genitive: end in ـَيْنِ (a letter with fatḥah, sākin yāʾ, and nūn with kasrah), as in رَجُلَيْنِ.
● Important point: The accusative and genitive dual forms are exactly the same in form and sound.