From Proto-Finnic *-t'oin. Cognates include Finnish -ton and Estonian -tu.
-toi (front vowel variant -töi)
| Declension of -toi (Type 21/ozatoi, tt-t gradation) | ||
|---|---|---|
| singular | plural | |
| nominative | -toi | -ttomat |
| genitive | -ttoman | -ttomin |
| partitive | -ttomua | -ttomii |
| illative | -ttomah | -ttomih |
| inessive | -ttomas | -ttomis |
| elative | -ttomaspäi | -ttomispäi |
| allative | -ttomale | -ttomile |
| adessive | -ttomal | -ttomil |
| ablative | -ttomalpäi | -ttomilpäi |
| translative | -ttomakse | -ttomikse |
| essive | -ttomannu | -ttominnu |
| abessive | -ttomattah | -ttomittah |
| comitative | -ttomanke | -ttominke |
| instructive | -ttomin | |
| prolative | -ttomači | |