From Middle Welsh syllu (“to stare”), from Proto-Celtic *stillom (“look”), of uncertain ultimate origin.
syllu (first-person singular present syllaf, not mutable)
| singular | plural | impersonal | ||||||
|---|---|---|---|---|---|---|---|---|
| first | second | third | first | second | third | |||
| present indicative/future | syllaf | sylli | sylla | syllwn | syllwch | syllant | syllir | |
| imperfect (indicative/subjunctive)/ conditional |
syllwn | syllit | syllai | syllem | syllech | syllent | syllid | |
| preterite | syllais | syllaist | syllodd | syllasom | syllasoch | syllasant | syllwyd | |
| pluperfect | syllaswn | syllasit | syllasai | syllasem | syllasech | syllasent | syllasid, syllesid | |
| present subjunctive | syllwyf | syllych | syllo | syllom | sylloch | syllont | syller | |
| imperative | — | sylla | sylled | syllwn | syllwch | syllent | syller | |
| verbal noun | syllu | |||||||
| verbal adjectives | sylledig sylladwy | |||||||
| Inflected colloquial forms | singular | plural | ||||
|---|---|---|---|---|---|---|
| first | second | third | first | second | third | |
| future | sylla i, syllaf i | sylli di | syllith o/e/hi, sylliff e/hi | syllwn ni | syllwch chi | syllan nhw |
| conditional | syllwn i, syllswn i | syllet ti, syllset ti | syllai fo/fe/hi, syllsai fo/fe/hi | syllen ni, syllsen ni | syllech chi, syllsech chi | syllen nhw, syllsen nhw |
| preterite | syllais i, sylles i | syllaist ti, syllest ti | syllodd o/e/hi | syllon ni | sylloch chi | syllon nhw |
| imperative | — | sylla | — | — | syllwch | — |
| Note: All other forms are periphrastic, as usual in colloquial Welsh. | ||||||