● The grammatical cases of sound plurals for rational masculine nouns and adjectives are recognized by their final sounds:
○ nominative: ends in ـُونَ (ūna: sākin wāw and nūn with fatḥah), as in مُؤْمِنُونَ (many believing men).
○ accusative and genitive: end in ـِينَ (īna: a letter with kasrah, sākin yāʾ, and nūn with fatḥah), as in مُؤْمِنِينَ.
● Difference from the dual: The accusative dual ending is ـَيْنِ (ayni), with fatḥah before yāʾ, while the masculine plural ending is ـِينَ (īna), with kasrah before yāʾ.
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Case-Ending Rule for the Masculine Sound Plural
Grammatical Cases of Sound Plurals (Masculine and Feminine)
● The grammatical cases of sound plurals for rational masculine nouns and adjectives are recognized by their final sounds:
○ nominative: ends in ـُونَ (ūna: sākin wāw and nūn with fatḥah), as in مُؤْمِنُونَ (many believing men).
○ accusative and genitive: end in ـِينَ (īna: a letter with kasrah, sākin yāʾ, and nūn with fatḥah), as in مُؤْمِنِينَ.
● Difference from the dual: The accusative dual ending is ـَيْنِ (ayni), with fatḥah before yāʾ, while the masculine plural ending is ـِينَ (īna), with kasrah before yāʾ.