| Present | Preterite | |
|---|---|---|
| Indicative | ||
| 1st person | (ic) costige | (ic) costode |
| 2nd person | (þū) costast | (þū) costodest |
| 3rd person | (hē/hēo/hit) costaþ | (hē/hēo/hit) costode |
| Plural | (wē/gē/hīe) costiaþ | (wē/gē/hīe) costodon |
| Subjunctive | ||
| Singular | costige | costode |
| Plural | costigen | costoden |
| Participles | ||
| Plural | costiende | costod |
| Imperative | ||
| Singular | costa | - |
| Plural | costiaþ | - |
| Inflected Infinitive | ||
| costienne | ||