| Ending | -(i)em |
-(i)em ending for all nouns. If the stem ends with -k or -g, use -iem, otherwise use -em.| Masculine Singular Nominative Case | Masculine Singular Instrumental Case | English |
|---|---|---|
| dom | domem | a house |
| telefon | telefonem | a phone |
| samochód | samochodem | a car |
| budynek | budynkiem | a building |
| las | lasem | a forest |
| kot | kotem | a cat |
| ptak | ptakiem | a bird |
| krok | krokiem | a step |
| róg | rogiem | a horn |
| ogrodnik | ogrodnikiem | a gardener |
| pracownik | pracownikiem | a worker |
| słoń | słoniem | an elephant |
| lew | lwem | a lion |
| pies | psem | a dog |
| bóbr | bobrem | a beaver |
| mąż | mężem | a husband |
