- هٰذَا ثَوْبٌ أَحْمَرُ — nominative adjective: one dammah, no tanwin.
- رَأَيْتُ ثَوْبًا أَحْمَرَ — accusative adjective: one fathah.
- مَرَرْتُ بِثَوْبٍ أَحْمَرَ — basic genitive: one fathah because أَحْمَرَ is ghayr munsarif.
The noun ثَوْبٌ/ثَوْبًا/ثَوْبٍ remains fully declinable; only its adjective follows the taught special pattern.