● Diptote nouns have only two visible case forms. Learn them carefully:
○ nominative: shown by one ḍammah, as in إِبْرَاهِيمُ.
○ accusative: shown by one fatḥah, as in إِبْرَاهِيمَ.
○ genitive: also shown by one fatḥah, as in إِبْرَاهِيمَ.
● Important rule: A diptote does not accept kasrah in the genitive; it takes fatḥah. Therefore, its accusative and genitive forms are exactly the same.
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Case-Ending Rules for Diptote Nouns
Declinable and Indeclinable Nouns: Fully Declinable and Diptote
● Diptote nouns have only two visible case forms. Learn them carefully:
○ nominative: shown by one ḍammah, as in إِبْرَاهِيمُ.
○ accusative: shown by one fatḥah, as in إِبْرَاهِيمَ.
○ genitive: also shown by one fatḥah, as in إِبْرَاهِيمَ.
● Important rule: A diptote does not accept kasrah in the genitive; it takes fatḥah. Therefore, its accusative and genitive forms are exactly the same.