| Sg | Pl | |
| 1st | ? (rule) | dugum (rule) |
| 2nd | ?r (rule) | dugið (rule) |
| 3rd | dugir (rule) | duga (rule) |
| Sg | Pl | |
| 1st | ?a (rule) | ?um (rule) |
| 2nd | ?ir (rule) | ?uð (rule) |
| 3rd | ?i (rule) | ?u (rule) |
| Sg | Pl | |
| 1st | dugumk (rule) | dugumk (rule) |
| 2nd | ?sk (rule) | dugizk (rule) |
| 3rd | dugisk (rule) | dugask (rule) |
| Sg | Pl | |
| 1st | ?umk (rule) | ?umsk (rule) |
| 2nd | ?isk (rule) | ?uzk (rule) |
| 3rd | ?isk (rule) | ?usk (rule) |
| Sg | Pl | |
| 1 | duga (rule) | dugim (rule) |
| 2 | dugir (rule) | dugið (rule) |
| 3 | dugi (rule) | dugi (rule) |
| Sg | Pl | |
| 1 | ?a (rule) | ?im (rule) |
| 2 | ?ir (rule) | ?ið (rule) |
| 3 | ?i (rule) | ?i (rule) |
| Form | |
| Participle | dugandi (rule) |
| Past participle | ?r (rule) |
| Middle infinitive | dugask (rule) |
| Sg | |
| 2nd | dug (rule) |