Cumann Gaeilge na hAstráile
Bíoḋ bród ort as do ṫeanga!
Folaíonn grá gráin.
—Seanfhocal

The verbal noun following ag is the equivalent of the present participle (‑ing words) in English, e.g. “I am writing” Tá mé ag scríobh. This is similar to the old fashioned/dialect English of The Twelve Days of Christmas, e.g. “Twelve lords a‑leaping” or Bob Dylan’s “The times they are a‑changin’ ”. Like ag “at”, this a‑ also comes from a preposition (Middle/Old English an) meaning “on”. Other Celtic languages have a similar structure: Scottish Gaelic a’ sgrìobhadh, Welsh yn ysgrifennu, Cornish ow skrifa, Breton o skrivañ.

It can also be the equivalent of the English infinitive (verb with ‘to’ before it), e.g. “I like to write,” Is maith liom scríobh. “I’m trying to write a letter,” Tá mé ag iarraidh litir a scríobh.

It is also the noun that describes the activity of the verb. Often this is different in English, e.g. “marrying” vs. “marriage”, but often both are covered by the verbal noun in Irish ( pósadh). Is maith liom scríobh above means both “I like to write” and “I like writing”.

Verbal nouns, just like other nouns in Irish, have different kinds of endings which aren’t predictable from the verb stem. There is a limited list of endings, but you have to learn the form when you learn the verb. Many verbal nouns also have different endings in different dialects, e.g. feiceáil is feiscint in Munster.

This table is adapted from a few different sources including Learning Irish (Micheál Ó Siadhail), Gramadach gan Stró (Éamonn Ó Dónaill) & Basic Irish: A Grammar and Workbook (Nancy Stenson). A couple of (Conamara) dialect forms left in are in grey & between {}.

Ending Verb Verbal Noun Type of Verb
MAIN TYPES
no ending—verb root (imperative) is used díol¹
fás¹
foghlaim²
íoc¹
ól¹
péinteáil¹
scríobh¹
snámh¹
  All verbs ending in ‑(e)áil
Group of mainly Type 1 (one syllable) verbs
‑(e)adh  /ə/ bris¹
dún¹
glan¹
→ briseadh
→ dúnadh
→ glanadh
The majority of Type 1 verbs (& only Type 1)
‑(i)ú /uː/ ciúnaigh²
comhairligh²
lagaigh²
maslaigh²
tanaigh²
tosaigh²
→ ciúnú [< ciúin ‘quiet’]
→ comhairliú [< comhairle ‘advice’]
→ lagú [< lag ‘weak’]
→ maslú [< masla ‘(an) insult’]
→ tanú [< tanaí ‘thin’]
→ tosú [< tosach ‘beginning’]
A number of Type 2 verbs made from nouns & adjectives
(no other verbs take this ending)
‑t  /tʹ/ bain¹
ceil¹
cosain²
imir²
labhair²
oscail²
tiomáin¹
→ baint
→ ceilt
→ cosaint
→ imirt
→ labhairt
→ oscailt
→ tiomáint
Type 1 & Type 2 verbs ending in slender l, n, r
slender ending made broad ceangail²
cuir¹
goil¹
siúil¹
taistil²
→ ceangal
→ cur
→ gol
→ siúl
→ taisteal
Mostly Type 1 verbs
MORE MARGINAL TYPES
‑(e)amh /əv/ /əw/ /ə/ seas¹
comhair¹
→ seasamh
→ comhaireamh
A group of Type 1 verbs
‑(a)í /iː/ éirigh²
suigh¹
luigh¹
guigh¹
→ éirí [< older éirighe]
→ suí [< older suidhe]
→ luí [< older luighe]
→ guí [< older guidhe]
A group of Type 1 & 2 verbs that added ‑e in pre-1948 spelling.
‑(e)ach /əx/ scread¹
réitigh²
ceannaigh²
cumhdaigh²
→ screadach
→ réiteach
→ ceannach
→ cumhdach
Very few verbs
‑(e)acht /əxt/ fan¹ → fanacht Very few verbs
‑(e)achtáil /əxtɑːlʹ/ airigh²
mair¹
→ aireachtáil
→ maireachtáil
A group of verbs of Types 1 & 2
‑(e)achan /əxəɴ/ dubhaigh²
tiubhaigh²
→ dúchan [< dubh ‘black’]
→ tiúchan [< tiubh ‘thick’]
A small group of verbs formed from other words
‑(e)áil /ɑːlʹ/ fág¹
tóg¹
coinnigh²
→ fágáil
→ tógáil
→ coinneáil
Very few verbs of (mostly) Type 1
‑(e)an /əɴ/ leag¹
lig¹
→ leagan
→ ligean
Very few verbs of Type 1
int /əɴʹtʹ/ tuig¹ → tuiscint Very few verbs of Type 1
‑iúint /uːɴtʹ/ feil¹
creid¹
oir¹
→ feiliúint
→ creidiúint
→ oiriúint
A group of Type 1 verbs
{optionally some Type 1 verbs with roots ending in /ʟʹ/ or /r/}
‑im /əmʹ/ tit¹
doirt¹
→ titim
→ doirtim
Very few verbs of Type 1
‑eál /ɑːʟ/ {coinnigh² → coinneál²} Very few verbs of Type 2
‑táil  /tɑːlʹ/ {cas¹ → castáil¹} Very few verbs of Type 1
‑e  /ə/ {guidh → guidhe} Very few verbs of Type 1