Abstract The paper proposes a constructionist analysis of two highly syncretic non-finite forms in Irish, traditionally referred to as the verbal noun (VN) and the verbal adjective (VA). The VN can fulfil the function of the infinitive, the ‘present participle’ in the periphrastic progressive, the argument supporting (AS) nominal and the R(eferential)-nominal. The VA can function as the passive participle in periphrastic passives/resultatives, the ‘passive’ adjective, the active participle (showing further syncretism with the genitive of VN) and the ‘active’ adjective. The basic idea is that the two syncretic forms receive a unified analysis (i.e. same structure). The VN is viewed as a kind of “elsewhere” realization of [vP[Root]] in all contexts except for [Tfin [VoiceP [vP [Root]]]]. VA spell-out is implemented when the morphosyntactic bundle carries no features that positively define the input as verbal or nominal. The height of affix attachment is indicative of the type of participle involved. Verbal passive/perfective participles and corresponding adjectives embed the external argument introducing projection (VoiceP), whereas active verbal participles and adjectives lack it. The extensive multifunctionality and syncretism in Irish seem to be closely linked to the lack of the AspP layer in the structure of non-finite verbs, nominals and adjectives as well as the lack of overt transitivizing morphology.
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