قِيَامُ زَيْدٍ
Zayd is the semantic agent, yet zaydin is genitive because it is the second term of iḍāfah. Do not replace the correct genitive ending with nominative merely to show agency.
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Grammatical Case Versus Semantic Role
The Maṣdar: Meaning, Patterns, Governance and Iḍāfah
قِيَامُ زَيْدٍ
Zayd is the semantic agent, yet zaydin is genitive because it is the second term of iḍāfah. Do not replace the correct genitive ending with nominative merely to show agency.