جَاءَ قَاضٍ
Translation: A judge came.
جَاءَ: past verb, built on fatḥa.
قَاضٍ: nominative subject; its underlying yāʾ has an estimated ḍamma, and the yāʾ is dropped in this indefinite form.
Exam point: Do not mistake kasra tanwīn for genitive here; the noun is the subject. This is a supplementary example.