I was wondering, is it possible that the following words and phrases belong to Cois Fharraige?

Gnaithe, eicínt, sol má, a bheas, a bhíonns, méir, tilleadh, ar chúla, ar (as a possessive), 'ur (possessive), caraid, leitir, driofúr, úlla (nominative singular), mara (instead of 'mura'), uilig, feilm, inín, muic, soibhir, bróig, amáireach, farc, spúnóig, etc.

The sources are a worksheet and an answer sheet found in Internet, published by the permission of N. Stenson.

Yes, they are. They're part of her worksheet for extra exercises from Learning Irish, aren't they?

Yes, typical "Learning Irish" spelling

caraid, inín, muic, bróig, spúnóig: these are all instances of where the erstwhile dative has become the nominative in Cois Fharraige.

A bheas: the correct relative form of the verb

A bhíonns: a colloquial variant, combining a bhíonn and a bheas.

Sol má: must mean sara/sula.

I can't comment on the rest.

a bheas is future tense
a bhíonns is present habitual (traditionally a bhíos)



Yes.

Ah, yes, thank you.

It seems to be so. Unfortunately the worksheet/answers are the only things I have, no textbook. Thank you for the confirmation.

The textbook (at least the 1995 edition) is available online:
https://archive.org/details/learning-ir ... d/mode/2up