| Sg. Indef. | fongsul |
| Sg. Def. | fongslið |
| Pl. Indef. | fongsul |
| Pl. Def. | fongslini |
| Sg. Indef. | fongsuls |
| Sg. Def. | fongsulsins |
| Pl. Indef. | fongsla |
| Pl. Def. | fongslanna |
| Sg. Indef. | fongsli |
| Sg. Def. | fongslinum |
| Pl. Indef. | fongslum |
| Pl. Def. | fongslunum |
| Sg. Indef. | fongsul |
| Sg. Def. | fongslið |
| Pl. Indef. | fongsul |
| Pl. Def. | fongslini |