| Case | Singular | Plural |
|---|---|---|
| nom | duch | duchy |
| gen | ducha | duchů |
| dat | duchu | duchům |
| acc | duch | duchy |
| voc | duchu | duchy |
| loc | duchu | duších, duchách |
| instr | duchem | duchy |
| Case | Singular | Plural |
|---|---|---|
| nom | duch | duchové |
| gen | ducha | duchů |
| dat | duchovi, duchu |
duchům |
| acc | ducha | duchy |
| voc | duchu | duchové |
| loc | duchovi, duchu |
duších, duchách |
| instr | duchem | duchy |