ABSTRACT
Irregular forms include both Standard Caighdean Oifigiuil (CO) forms and some of the most common variants encountered. However, irregularities can be quite fluid, and other variants may be heard in certain regions. It is worthwhile for learners interested in the speech of a particular Gaeltacht to listen carefully for alternate forms. The verb to eat is fully regular except in the future and conditional; these are formed from the irregular stem íos-. The verb to hear has two distinct imperative stems, cluin and clois, both accepted as standard by the CO. In addition to the occasional regularizations of certain dependent forms for particular verbs, some dialects have more complex patterns that draw on older stem variations now lost in the CO and dialects on which it was based. These can be grouped into further stem irregularities, and irregularities of mutation.
