| Sg | Pl | |
| Nom | skógr | skógar (rule) |
| Acc | skóg (rule) | skóga (rule) |
| Dat | skógi (rule) | skógum (rule) |
| Gen | skógar (rule) | skóga (rule) |
| Sg | Pl | |
| Nom | skógrinn (rule) | skógarnir (rule) |
| Acc | skóginn (rule) | skógana (rule) |
| Dat | skóginum (rule) | skógunum (rule) |
| Gen | skógarins (rule) | skóganna (rule) |