Yes, more or less so.

When there is no eclipsis or lenition and the -n in "an" would be fully pronounced it would be pronounced like [ŋ] because of following [g]:
e.g. an Gael /əŋ ge:l/
In case of eclipsis this changes to:
e.g. ar an nGael /er´ ə ŋe:l/ (loss of the [g] sound)

The difference is /ŋg/ (like in "finger") vs. single /ŋ/.

The difference between them isn't different tense but different voice (and different aspect)

The first sentence is passive voice (whysoever), habitual past, progressive:
lit.: "Was usually soccer being played by you when you were a girl?"
Progressive (continuous) aspect because playing soccer takes time.
(So perhaps like "Have you spent much time playing soccer ...")

The second sentence is active voice, habitual past, non-progressive.
But because playing soccer takes time progressive would be preferred, I think:
So, active voice progressive habitual past:
An mbíteá ag imirt sacair nuair a ...

Yes
("Tá mé ag bheith" is always impossible, btw)



Habitual progressive is used for actions of certain length done often.
So in light of the fact that you usually deliver lengthy sermons habitual present progressive is okay.
But perhaps twice: ... nuair a bhím ag caint



Here I'd guess you don't declaim perorations but give usually short advices he really should listen to.



same as in first sentence.
Certainly habitual past twice here, I'd say: ... nuair a bhínn



This is non-habitual past.
So you are referring to a single event.



Oh no, not totally the same - only in this instance.



Hmm, maybe.



I don't know.



OK.

Basically I had forgotten about the "dentals" rule and didn't realize that was what was going on.



So in Munster the "dentals" rule is different? Tell me more!

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ЯГОН ТОҶИК НЕСТ ИНҶО???

Wait, okay, so my assumption that the meaning was equivalent to "tend to" was incorrect. Could you give a more accurate translation of the two sentences into English or explain the difference between them more clearly, por favor? Is it just the lengthiness/wordiness like you suggested?

Ní bhíonn sé ag éisteacht nuair atáim ag caint
Ní éisteann sé nuair atáim ag caint


That's bad news for me if even you don't know!


I knew about the different voice, I was just asking about the aspect. You clarified that it's because playing soccer takes time. I have encountered this (and was confused until seeing your explanation) with bí ag súgradh and bí ag imirt but could you suggest to me some other verbs that might be considered time-taking so I can get a better sense? Thanks in advance

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ЯГОН ТОҶИК НЕСТ ИНҶО???

Is it an t-aonú lá dhéag or déag? An xxú lá déag seems to be pretty common (https://www.gaois.ie/g3m/en/?txt=lá+déag&SearchMode=narrow), and you guys do the same thing (well, most of the time – see here and here).

By the way, it seems that, unlike here, diacritics break links on here – could someone please look into that?

According to the document 'Uimhreacha na Gaeilge' written by M. Mechura (38 pages-long PDF document that describes all the rules about numbers in Irish), it is "an t-aonú lá déag", looks like "dhéag" isn't used in ordinal numbers.
Aon lá dhéag, but an t-aonú á déag.

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

Yes, no lenition of déag in ordinal numbers

Alright, thanks guys, and and thanks for that guide, Lughaidh...38 pages...

The Irish system of numbers is so complicated (especially because of declensions and initial mutations) that I very often need to check that document when I have to write a number in Irish...
In Breton it's complicated too for French speakers, but in Irish it's a nightmare

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne