(e)adh is added to verbs ending in…
ic ,ll,ill
-ú or -iú is added to multisyllabic verbs (however there are expectations) ending in…
igh
irregular verbs ending in igh such as ceannaigh or cónaigh, you add…
ch,í
verbs such as bain and imir … is added
t
verbs such as fág and tóg… is added
áil
verbs such as féach and tuig… is added
(a)int
verbs such as caith and deán… is added
eamh, amh