Editing Irish initial mutations (section)

==Environments of Lenition==
=== After proclitics ===
==== After the definite article ====
The definite article triggers the lenition of:

# a feminine noun in the nominative singular
#: {{Lang|ga|an '''bh'''ean}} "the woman"
# a masculine noun in the genitive singular
#: {{Lang|ga|an '''fh'''ir}} "of the man" e.g. {{Lang|ga|carr an fhir}}, the man's car (car of the man)
# a noun in the dative singular, when the article follows one of the prepositions {{Lang|ga|de}} "from", {{Lang|ga|do}} "to" or {{Lang|ga|i}} "in"
#: {{Lang|ga|do}} + {{Lang|ga|an}} = {{Lang|ga|don}}: {{Lang|ga|don '''fh'''ear}} "to the man"
#: {{Lang|ga|de}} + {{Lang|ga|an}} = {{Lang|ga|den}}: {{Lang|ga|den '''bh'''ean}} "from the woman"
#: {{Lang|ga|i}} + {{Lang|ga|an}} = {{Lang|ga|sa(n)}}: {{Lang|ga|sa '''ch'''rann}} "in the tree"; {{Lang|ga|san '''fh'''ómhar}} "in the autumn"

[[Lenition#Blocked lenition|Lenition is blocked]] when a [[coronal consonant]] is preceded by {{lang|ga|an}}.

:: {{Lang|ga|an '''d'''eoch}} "the drink", although {{Lang|ga|deoch}} is feminine nominative singular
:: {{Lang|ga|an '''t'''í}} "of the house", although {{Lang|ga|tí}} is masculine genitive singular

Instead of leniting to {{IPA|/h/}}, after the definite article, {{IPA|/sˠ, ʃ/}} become {{IPA|/t̪ˠ, tʲ/}} (written {{vr|ts}}):

:: {{Lang|ga|an '''ts'''úil}} {{IPA|/ən̪ˠ t̪ˠuːlʲ/}} "the eye" (fem. nom. sg.)
:: {{Lang|ga|an '''ts'''aoil}} {{IPA|/ən̪ˠ t̪ˠiːlʲ/}} "of the world" (masc. gen. sg.)

==== After the vocative particle {{Lang|ga|a}} ====

* {{Lang|ga|a '''Bh'''ríd}} "Bríd!"
* {{Lang|ga|a '''Sh'''eáin}} "Seán!"
* {{Lang|ga|a '''ch'''airde}} "my friends!"

==== After possessive pronouns ====
The possessive pronouns that trigger lenition are {{Lang|ga|mo}} "my", {{Lang|ga|do}} "your (sg.)", {{Lang|ga|a}} "his"

* {{Lang|ga|mo '''mh'''ac}} "my son"
* {{Lang|ga|do '''th'''each}} "your house"
* {{Lang|ga|a '''ph'''eann}} "his pen"

==== After certain prepositions ====

* {{Lang|ga|de '''ch'''rann}} "out of a tree"
* {{Lang|ga|faoi '''ch'''rann}} "under a tree"
* {{Lang|ga|mar '''dh'''uine}} "as a person"
* {{Lang|ga|ó '''Ch'''orcaigh}} "from Cork"
* {{Lang|ga|roimh '''mh'''aidin}} "before morning"
* {{Lang|ga|trí '''sh'''ioc agus '''sh'''neachta}} "through frost and snow"
* {{Lang|ga|um '''Ch'''áisc}} "at Easter"
* {{Lang|ga|idir '''fh'''ir agus '''mh'''ná}} "both men and women"
* {{Lang|ga|ar '''bh'''ord}} "on a table"

==== After the preterite/conditional of the [[Irish syntax#The copula is|copula]] ====

* {{Lang|ga|Ba '''dh'''uine mór é.}} "He was a big person."
* {{Lang|ga|Ba '''dh'''eas uait é.}} "That was nice of you."

==== After the preterite preverbal particles ====

* {{Lang|ga|Níor '''mhúinteoir''' é.}} "He was not a teacher."
* {{Lang|ga|Níor '''th'''ug mé}} "I didn't give"
* {{Lang|ga|Ar '''sh'''agart é?}} "Was he a priest?"
* {{Lang|ga|Ar '''th'''áinig sé?}} "Did he come?"

==== After certain preverbal particles ====

* {{Lang|ga|ní '''th'''uigim}} "I don't understand"
* {{Lang|ga|má '''th'''agann sé}} "if he comes"
* {{Lang|ga|an fear a '''th'''abharfaidh dom é}} "the man who will give it to me"

==== A verb in the preterite, imperfect or conditional ====
These were originally preceded by the particle {{Lang|ga|do}} and often still are in Munster.

* {{Lang|ga|'''bh'''ris mé}} "I broke"
* {{Lang|ga|'''bh'''risinn}} "I used to break"
* {{Lang|ga|'''bh'''risfinn}} "I would break"

=== In modifier + head constructions ===
[[Lenition#Blocked lenition|Lenition is blocked]] in these constructions if two coronals are adjacent.

==== After certain numbers ====
The singular form is used after numbers and is lenited in the following cases:

* {{Lang|ga|aon '''bh'''ó amháin}} "one cow"
* {{Lang|ga|an chéad '''bh'''liain}} "the first year"
* {{Lang|ga|dhá '''th'''each}} "two houses"
* {{Lang|ga|beirt '''fh'''ear}} "two men"
* {{Lang|ga|trí '''bh'''ád}} "three boats"
* {{Lang|ga|ceithre '''bh'''ó}} "four cows"
* {{Lang|ga|cúig '''ph'''unt}} "five pounds"
* {{Lang|ga|sé '''mh'''í}} "six months"

==== After preposed adjectives ====
Constructions of adjective + noun are written as compounds.

* {{Lang|ga|sean'''bh'''ean}} "old woman"
* {{Lang|ga|droch'''dh'''uine}} "bad person"
* {{Lang|ga|dea-'''sh'''eirbhís}} "good deed"
* {{Lang|ga|nua'''th'''eanga}} "modern language"
* {{Lang|ga|tréan'''mh'''uir}} "stormy sea"
* {{Lang|ga|fíor'''ch'''neas}} "true skin"
* {{Lang|ga|ard'''bh'''rú}} "high pressure"
* {{Lang|ga|óg'''fh'''ear}} "young man"

==== After most prefixes ====

* {{Lang|ga|an-'''bh'''eag}} "very small"
* {{Lang|ga|ró-'''bh'''eag}} "too small"
* {{Lang|ga|ais'''gh'''abháil}} "retake"
* {{Lang|ga|ath'''bh'''liain}} "new year"
* {{Lang|ga|do'''bh'''réagnaithe}} "undeniable"
* {{Lang|ga|fo'''ch'''upán}} "saucer"
* {{Lang|ga|for'''bh'''ríste}} "overalls"
* {{Lang|ga|idir'''ch'''reidmheach}} "interconfessional"
* {{Lang|ga|il'''ph'''ósadh}} "polygamy"
* {{Lang|ga|leas'''mh'''áthair}} "stepmother"
* {{Lang|ga|mí'''sh'''ásta}} "unhappy"
* {{Lang|ga|neamh'''ch'''odladh}} "insomnia"
* {{Lang|ga|príomh'''ch'''athair}} "capital city"
* {{Lang|ga|so'''bh'''riste}} "fragile"

==== The second part of a compound ====

* {{Lang|ga|ainm'''fh'''ocal}} "noun" (lit. "name word")
* {{Lang|ga|dú'''gh'''orm}} "dark blue"
* {{Lang|ga|stát'''fh'''iach}} "national debt"

=== In head + modifier constructions ===
In these constructions coronals are lenited even following other 

* {{Lang|ga|aimsir '''bh'''áistí}} "rainy weather" (lenition after a feminine singular noun)
* {{Lang|ga|buidéil '''sh'''ú}} "bottles of juice" (lenition after a plural ending in a slender consonant)
* {{Lang|ga|teach '''Sh'''eáin}} "Seán's house" (lenition of a definite noun in the genitive)

==== Postposed adjectives in certain circumstances ====

* {{Lang|ga|bean '''dh'''eas}} "a pretty woman" (lenition after a feminine singular noun)
* {{Lang|ga|na fir '''mh'''óra}} "the big men" (lenition after a plural noun ending in a slender consonant)
* {{Lang|ga|ainm an fhir '''bh'''ig}} "the name of the small man" (lenition after a masculine singular noun in the genitive)
* {{Lang|ga|sa chrann '''mh'''ór}} "in the big tree" (lenition after a noun lenited by virtue of being in the dative after {{Lang|ga|den}}, {{Lang|ga|don}}, or {{Lang|ga|sa(n)}})