Abstract :
The paper examines two questions concerning Irish non-finite clauses, i.e.: (1) the free variation between overt subjects and PRO and (2) dialectal variation. As regards the first issue, it is argued that Irish non-finite clauses represent two types, namely: clauses with PRO which exhibit anaphoric Agr in T checking PROʹs null Case and non-finite clauses which exhibit non-anaphoric Agr in T checking nominative Case of the subject. The mechanism licensing overt subjects and PRO can be used to account for distinct word orders found in Northern and in Southern dialects. While the former allow overt object shift in the presence of either the overt subject or PRO, hence yielding the following orders: S+O+particle+V and PRO+O+particle+V, the latter trigger overt object shift only in the presence of PRO and never in the presence of an overt subject, hence giving rise to the following patterns: S+particle+V+O and PRO+O+particle+V. In order to account for this dialectal variation, the particle a is taken to represent a marker of transitivity in Northern dialects and hence to appear in v. Object shift is triggered by the necessity to satisfy the vʹs EPP-feature and subject raising from Spec, vp is triggered by the EPP-feature of T. For Southern dialects the following assumptions are made: (1) the particle a has always a Case feature to check, (2) the particle a can appear in v or in T, when it appears in v, it checks the Case of the object and when it appears in T, it checks the Case of the subject, (3) overt subjects are licensed by the particle a, which is an overt realisation of non-anaphoric Agr in T, and (4) PRO is licensed by anaphoric Agr in T. Under these assumptions, the order S+particle+V+O arises if a is in T, whereas the order PRO+O+particle+V surfaces if a occurs in v. It is further suggested that subject and object raise in Southern dialects for Case reasons, not for EPP-checking. The pattern S+O+particle+V is impossible in Southern dialects, as in order to license the overt subject a must be in Agr, whereas in order to license object shift a must appear in v. Since a cannot occupy two positions simultaneously, this order is never attested.
