| Singular | Plural | |
|---|---|---|
| Nominativ | regula, regulaeque | regulae |
| Genitiv | regulae, regulai | regularum |
| Dativ | regulae, regulai | regulis, regulabus |
| Akkusativ | regulam | regulas |
| Ablativ | regula, regulaeque, regulad | regulis, regulabus |
| Vokativ | regula, regulaeque | regulae |
12 (20) Formen für „regula“