جَاءَنِي عُمَرُ — ʿUmar came to me.
جَاءَ: past-tense verb, built on fatḥa.
نِ: nūn al-wiqāyah (protective nūn), with no independent syntactic case.
ي: first-person attached pronoun, direct object, in the accusative position.
عُمَرُ: subject (fāʿil), nominative, visibly marked by ḍamma.
A verbal subject is nominative. This diptote has one ḍamma, not ḍammatān.
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Noun Case Classes: Type 3 — Diptote (Ghayr Munṣarif)
جَاءَنِي عُمَرُ — ʿUmar came to me.
جَاءَ: past-tense verb, built on fatḥa.
نِ: nūn al-wiqāyah (protective nūn), with no independent syntactic case.
ي: first-person attached pronoun, direct object, in the accusative position.
عُمَرُ: subject (fāʿil), nominative, visibly marked by ḍamma.
A verbal subject is nominative. This diptote has one ḍamma, not ḍammatān.