| costnian |
| costnienne |
| Present | costniende |
| Past | (ġe)costnod |
| 1st sing. | costniġe |
| 2nd sing. | costnast |
| 3rd sing. | costnaþ |
| 1st plur. | costniaþ |
| 2nd plur. | costniaþ |
| 3rd plur. | costniaþ |
| 1st sing. | costnode |
| 2nd sing. | costnodest |
| 3rd sing. | costnode |
| 1st plur. | costnodon |
| 2nd plur. | costnodon |
| 3rd plur. | costnodon |
| 1st sing. | costniġe |
| 2nd sing. | costniġe |
| 3rd sing. | costniġe |
| 1st plur. | costniġen |
| 2nd plur. | costniġen |
| 3rd plur. | costniġen |
| 1st sing. | costnode |
| 2nd sing. | costnode |
| 3rd sing. | costnode |
| 1st plur. | costnoden |
| 2nd plur. | costnoden |
| 3rd plur. | costnoden |
| Singular | costna |
| Plural | costniaþ |