جَاءَ عُثْمَانُ - nominative with dammah.
رَأَيْتُ عُثْمَانَ - accusative with fathah.
مَرَرْتُ بِعُثْمَانَ - without ال or idafah, genitive with fathah.
The same basic case pattern applies to سَكْرَانُ / سَكْرَانَ.
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Case Endings Still Follow the Ghayr Munsarif Pattern
Cause of Ghayr Munsarif: Additional Alif and Nun
جَاءَ عُثْمَانُ - nominative with dammah.
رَأَيْتُ عُثْمَانَ - accusative with fathah.
مَرَرْتُ بِعُثْمَانَ - without ال or idafah, genitive with fathah.
The same basic case pattern applies to سَكْرَانُ / سَكْرَانَ.