| Sg | Pl | |
| 1st | hefj (rule) | hefjum (rule) |
| 2nd | hefr (rule) | hefið (rule) |
| 3rd | hefr (rule) | hefja (rule) |
| Sg | Pl | |
| 1st | hófj (rule) | hófum (rule) |
| 2nd | hóft (rule) | hófuð (rule) |
| 3rd | hófj (rule) | hófu (rule) |
| Sg | Pl | |
| 1st | hefjumk (rule) | hefjumk (rule) |
| 2nd | hefsk (rule) | hefizk (rule) |
| 3rd | hefsk (rule) | hefjask (rule) |
| Sg | Pl | |
| 1st | ? (rule) | hófumsk (rule) |
| 2nd | ? (rule) | hófuzk (rule) |
| 3rd | hófjsk (rule) | hófusk (rule) |
| Sg | Pl | |
| 1 | hefja (rule) | hefim (rule) |
| 2 | hefir (rule) | hefið (rule) |
| 3 | hefi (rule) | hefi (rule) |
| Sg | Pl | |
| 1 | hœfa (rule) | hœfim (rule) |
| 2 | hœfir (rule) | hœfið (rule) |
| 3 | hœfi (rule) | hœfi (rule) |
| Form | |
| Participle | hefjandi (rule) |
| Past participle | hafinn (rule) |
| Middle infinitive | hefjask (rule) |
| Sg | |
| 2nd | hefj (rule) |