| Nominative | demonstrant |
| Genitive | demonstranta |
| Dative | demonstrantowi |
| Accusative | demonstranta |
| Instrumental | demonstrantem |
| Locative | demonstrancie |
| Vocative | demonstrancie |
| Nominative | demonstranci |
| Genitive | demonstrantów |
| Dative | demonstrantom |
| Accusative | demonstrantów |
| Instrumental | demonstrantami |
| Locative | demonstrantach |
| Vocative | demonstranci |