A manqūṣ noun ends in yāʾ preceded by kasra; the printed example is الْقَاضِي.
Nominative: estimated ḍamma (heaviness). Accusative: visible fatḥa. Genitive: estimated kasra (heaviness).
Book review: جَاءَنِي الْقَاضِي، وَرَأَيْتُ الْقَاضِيَ، وَمَرَرْتُ بِالْقَاضِي. You should now be able to parse every word and explain the case of the noun.
Also recognise the extra indefinite forms قَاضٍ / قَاضِيًا / قَاضٍ.