مَرَرْتُ بِعِمْرَانَ — I passed by ʿImrān.
مَرَرْتُ: verb and subject; بِـ: preposition; عِمْرَانَ: genitive after bi-, marked by fatḥa because it is a diptote.
“Genitive” names the case; fatḥa is its visible sign here.
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ʿImrān: Genitive Parsing
Diptote Causes — Additional Alif and Nūn and Their Conditions
مَرَرْتُ بِعِمْرَانَ — I passed by ʿImrān.
مَرَرْتُ: verb and subject; بِـ: preposition; عِمْرَانَ: genitive after bi-, marked by fatḥa because it is a diptote.
“Genitive” names the case; fatḥa is its visible sign here.