| Endings | -o | -e |
| Neuter Singular Nominative Case | English |
|---|---|
| okno | a window |
| źródło | a source |
| jabłko | an apple |
| pudło | a box |
| zadanie | a task |
| wyzwanie | a challenge |
| mieszkanie | a flat |
| pytanie | a question |
-ę or -um. These nouns have irregular declension.| Neuter Singular Nominative Case | English |
|---|---|
| zwierzę | a pet |
| muzeum | a museum |
