| Siebensachen | Nominativ, Singular | nominative case, singular | |
| Siebensachene | Genitiv, Singular | genitive case, singular | |
| Siebensachenen | Dativ, Singular | dative case, singular | |
| Siebensachen(e)s | Akkusativ, Singular | accusative case, singular | |
| Siebensachener | Nominativ, Plural | nominative case, plural | |
| Siebensachenern | Genitiv, Plural | genitive case, plural | |
| Siebensachenn | Dativ, Plural | dative case, plural |