Hi Liz and David,
>>> ar it aursliuctiu sido hErinn dogres ...
>>> arit fosgoilti sidha Erenn dogres."
>> air-it airslaicthe síde hÉrenn do grés ...
>> I thought 'it' was the 3rd plural present indicative of the copula.
>> According to Thurneysen p. 484 this is preceded by 'air' which he
>> calls a "prepositional prefix." I copied his spelling, including
>> the hyphen.
> Well, if Thurneysen does it that way, we can follow him.
Looking closely at §792, I see that Thurneysen cites the 3rd pl.
forms "air-it" and "airat", as well as 2nd pl. "ar-idib" (Wb.).
Kavanagh's Lexicon of the Wb. glosses lists "aris" as most common
3rd sg., as well as "ar is", and "airis". The standard practice
in Wb. is to write closely associated words, words in a phrase
having a single tonic, as one word. This is not the practice in
normalized texts, however. I would prefer, for the sake of the
reader's ease of interpretation, to follow MS (a) and write "ar it"
(because they-are) here.