Saw this in TYI,
"Dúirt sé liom go bhfuil tithe nua dá ndéanamh ar Bhóthar na Trágha agus gur dóigh leis go bhfaighidh sé ceann acu. =He told me that new houses are being built (made) on Strand Road and that he thinks that he will get one of them. "

I'm a little confused by the "dá", is it from de, do ?
Said he with me that houses new to its making on the road of the beach?

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Bíonn rudaí maithe mall

do + a = dá

'to their'

tá sé ag mo bhualadh/do mo bhualadh (at my/to my beating), so the same with ag + a and do + a and they fused together, in this case, to form 'dá' and the urú was pulled in (as the focus is the noun)

Think of it like the active AGENT and the passive PATIENT, as in 'the dentist [ACT] is drilling the tooth of the person [PASS]. In the case above, the houses are passive (like being born or being carried) and so, metaphorically, the act is 'towards' their (new) state of being, that of one day having been built, so you are saying 'the act of building is towards their state of being built', in a sense

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__̴ı̴̴̡̡̡ ̡͌l̡̡̡ ̡͌l̡*̡̡ ̴̡ı̴̴̡ ̡̡͡|̲̲̲͡͡͡ ̲▫̲͡ ̲̲̲͡͡π̲̲͡͡ ̲̲͡▫̲̲͡͡ ̲|̡̡̡ ̡ ̴̡ı̴̡̡ ̡͌l̡̡̡̡.___

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Bíonn rudaí maithe mall

Just to note that dá is actually pronounced á.

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

Thanks lon Dubh, I think you told me that before, but i had forgotten

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Bíonn rudaí maithe mall

No worries, there are many little facts like this that are easy to forget. By the way there used to be a habit of writing ghá when the meaning was active:

Bhíos ghá cheannach = I was buying it.

and dá when it was passive:

Bhí sé dá cheannach = It was being bought.

However both are á and there was never any distinction between them, it's just a made up distinction.

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

That's very interesting. Was it ever a real distinction as the dá --> ghá --> á pattern progressed or just a pedantic one?

I'm thinking of Léim sé ar an mbord (dynamic) and Tá sé ar an bhord (static) and obair baile (school work) and obair bhaile (work around the house) as (supposed) other examples

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__̴ı̴̴̡̡̡ ̡͌l̡̡̡ ̡͌l̡*̡̡ ̴̡ı̴̴̡ ̡̡͡|̲̲̲͡͡͡ ̲▫̲͡ ̲̲̲͡͡π̲̲͡͡ ̲̲͡▫̲̲͡͡ ̲|̡̡̡ ̡ ̴̡ı̴̡̡ ̡͌l̡̡̡̡.___