Deklinationen
| Singular | Plural | |
|---|---|---|
| Nominativ | singular sg penna | plural pl pennae |
| Genitiv | singular sg pennae | plural pl pennārum |
| Dativ | singular sg pennae | plural pl pennīs |
| Akkusativ | singular sg pennam | plural pl pennās |
| Ablativ | singular sg pennā | plural pl pennīs |
| Vokativ | singular sg penna | plural pl pennae |