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I use "thig liom" when I'm talking with someone I know is familiar with Ulster Irish (otherwise I say "is féidir liom" to avoid confusion).
thig liom and its variants also exist in Connachta, as far as I know... i don't remember the forms but they are in Learning Irish, maybe tigeann liom or sthg like that
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Example: An dtig leat litir a scriobh? Can you write a letter? For some reason however I use the "could" form much more in conversation like An dtiocadh leat litir a scriobh domh? (Could you write a letter for me?) An dtiocadh liom teacht ansin leatsa? (Can/could I come there with you?)
yeah, btw in Ulster (and Connachta) the verbal noun of "to come" (and of "to go" as well) is preceded by a and is always lenited except when preceded by "ag":
an dtiocfadh liom (a) theacht ansin leat?
(but: tá mé ag teacht, pronounced "tá mé 'teacht")
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It seems like when I see it in most books it's something like An bhféadfa litir a scriobh? (Can you write a letter? Not sure how they'd distinguish and say 'could you write a letter?') I never have figured it out just right in the other dialects or in the Caighdeán.
an bhféadfá is "could you" in Munster Irish.
"Féad" exists elsewhere too, but not always used in that way. As far as I know, in Ulster we can say "féadann duit", you can, etc (no subject, and the person is introduced by the preposition "do").
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I know it's not a very comprehensive way for me to speak, but I just learned to say certain thoughts in one way and they stick in my brain that way.
that's fine, if what you use is what native speakers say it's perfect

keep using them

There are many patterns with all these modal verbs (can, may, could, might, would, will etc etc) in Irish, it's hard to learn from books all the forms that exist in one dialect (because you can't find them in scholarly books). Actually, the best way to verify (if you can't go to the Gaeltacht) is to ask native speakers in the facebook group "Gaeilge Amháin"

There are several native speakers from Donegal there
