niweidio (first-person singular present niweidiaf, not mutable)
| singular | plural | impersonal | ||||||
|---|---|---|---|---|---|---|---|---|
| first | second | third | first | second | third | |||
| present indicative/future | niweidiaf | niweidi | niweidi, niweidia | niweidiwn | niweidiwch | niweidiant | niweidir | |
| imperfect (indicative/subjunctive)/conditional | niweidiwn | niweidit | niweidiai | niweidiem | niweidiech | niweidient | niweidid | |
| preterite | niweidiais | niweidiaist | niweidiodd | niweidiasom | niweidiasoch | niweidiasant | niweidiwyd | |
| pluperfect | niweidiaswn | niweidiasit | niweidiasai | niweidiasem | niweidiasech | niweidiasent | niweidiasid, niweidiesid | |
| present subjunctive | niweidiwyf | niweidiech | niweidio | niweidiom | niweidioch | niweidiont | niweidier | |
| imperative | — | niweidi, niweidia | niweidied | niweidiwn | niweidiwch | niweidient | niweidier | |
| verbal noun | niweidio | |||||||
| verbal adjectives | niweidiedig — | |||||||
| Inflected colloquial forms | singular | plural | ||||
|---|---|---|---|---|---|---|
| first | second | third | first | second | third | |
| future | niweidia i, niweidiaf i | niweidi di | niweidith o/e/hi, niweidiff e/hi | niweidiwn ni | niweidiwch chi | niweidian nhw |
| conditional | niweidiwn i, niweidswn i | niweidiet ti, niweidset ti | niweidiai fo/fe/hi, niweidsai fo/fe/hi | niweidien ni, niweidsen ni | niweidiech chi, niweidsech chi | niweidien nhw, niweidsen nhw |
| preterite | niweidiais i, niweidies i | niweidiaist ti, niweidiest ti | niweidiodd o/e/hi | niweidion ni | niweidioch chi | niweidion nhw |
| imperative | — | niweidia | — | — | niweidiwch | — |
| Note: All other forms are periphrastic, as usual in colloquial Welsh. | ||||||