| Sg | Pl | |
| 1st | ? (rule) | byggum (rule) |
| 2nd | byggt (rule) | byggvið (rule) |
| 3rd | ?r (rule) | byggva (rule) |
| Sg | Pl | |
| 1st | ?a (rule) | ?um (rule) |
| 2nd | ?ir (rule) | ?uð (rule) |
| 3rd | ?i (rule) | ?u (rule) |
| Sg | Pl | |
| 1st | byggvumk (rule) | byggvumk (rule) |
| 2nd | ? (rule) | byggvizk (rule) |
| 3rd | ?sk (rule) | byggvask (rule) |
| Sg | Pl | |
| 1st | ?umk (rule) | ?umsk (rule) |
| 2nd | ?isk (rule) | ?uzk (rule) |
| 3rd | ?isk (rule) | ?usk (rule) |
| Sg | Pl | |
| 1 | byggva (rule) | byggvim (rule) |
| 2 | byggvir (rule) | byggvið (rule) |
| 3 | byggvi (rule) | byggvi (rule) |
| Sg | Pl | |
| 1 | ?a (rule) | ?im (rule) |
| 2 | ?ir (rule) | ?ið (rule) |
| 3 | ?i (rule) | ?i (rule) |
| Form | |
| Participle | byggvandi (rule) |
| Past participle | ?r (rule) |
| Middle infinitive | byggvask (rule) |
| Sg | |
| 2nd | byggv (rule) |