Cumann Carad Na Gaeilge / The Philo-Celtic Society
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Eclipsis is putting a consonant in front of the beginning of a word.  You say the first consonant
but not the second consonant, which has now been 'eclipsed.'  There are a number of reasons
why you eclipse the beginning of a word.  Learn a few for now.
Cá (where) - causes eclipsis
Cónaíonn tú. You dwell.
Cá gcónaíonnn tú? Where dwell you?   (Where do you live?)
Plural Possessives
ár mbróga our shoes   bróga = shoes.
bhur gcaipíní your caps   caipíní = caps.
a n-úlla their apples   úlla = apples
Interrogatory “An” (“An” means “here comes a question”)             
Itheann tú. You eat.
An n-itheann tú anseo? Eat you here?   (Do you eat here?)
Relative “go” (that)
Pósfaidh mé. I will marry.
Sílim go bpósfaidh mé. I think that I will marry.           _
Use of Prepositions With the Article 'An' ('the')
an bord the table
ar an mbord on the table
Preposition “i” (“in”) without the article “an” (“the”)
gloine glass
i ngloine in a glass
If I have to eclipse a word because of these rules, what consonants do I use to eclipse other letters?
m  is used to eclipse   b
g  “”” c
n  “”” d
bh  “”” f
n “”” g
b “”” p
d “”” t
n “”” all vowels
l, m, n, r, and s have not been eclipsed since about the 12th century, so don’t eclipse those.    
i suíochán in a seat
Cá léim sé? Where jumped he?   (Where’d he jump?)  
ar an mullach on the summit