1. Scottish Gaelic influence [on Ulster Ir.]; 2. O’Rahilly’s theory [cf. Best² 527]; 3. Present for future in Ulster Irish; 4. Present for future in Early Irish; 5. A reconstruction of the data; 6. An alternative interpretation [cha associated with ‘informal’ style in Ulster].
Identifies its original syntactical usage and argues (with R. Thurneysen, GOI §861, vs. D. Greene, in Ériu 21 (1969), pp. 90-92) that it contains the consecutive conjunction co.