Nominative: جَاءَ عِمْرَانُ — subject, ḍamma.
Accusative: رَأَيْتُ عِمْرَانَ — object, fatḥa.
Genitive: مَرَرْتُ بِعِمْرَانَ — after preposition, fatḥa.
Remember: the genitive case does not make a diptote fully declinable; the sign used is simply different.
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Diptote Causes — Additional Alif and Nūn and Their Conditions
Nominative: جَاءَ عِمْرَانُ — subject, ḍamma.
Accusative: رَأَيْتُ عِمْرَانَ — object, fatḥa.
Genitive: مَرَرْتُ بِعِمْرَانَ — after preposition, fatḥa.
Remember: the genitive case does not make a diptote fully declinable; the sign used is simply different.