ضَرَبَ زَيْدٌ: Ḍaraba is an actual verb; it is not assigned nominative, accusative or genitive case.
جَاءَ ضَرَبُ: Ḍarab is a proper noun serving as subject; the nominative is visible.
Similar letters do not mean identical syntactic status. That contrast is central to this lesson.
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Diptote Causes — Verb Patterns and Their Conditions
ضَرَبَ زَيْدٌ: Ḍaraba is an actual verb; it is not assigned nominative, accusative or genitive case.
جَاءَ ضَرَبُ: Ḍarab is a proper noun serving as subject; the nominative is visible.
Similar letters do not mean identical syntactic status. That contrast is central to this lesson.