How does a broken plural show grammatical case in Arabic?

Cases of the Broken Plural and Changes When ال Is Added

• By tanwīn vowel marks (ٌ, ً, ٍ), like a singular noun
• By ـُونَ and ـِينَ, like the masculine sound plural
• By ـَانِ and ـَيْنِ, like the dual