Possession in Irish

Overview

Irish expresses possession in two main ways, both of which are essential at the A1 level. The first uses the preposition ag (at) with the verb tá — "Tá carr agam" literally means "There is a car at me," which is how Irish says "I have a car." The second uses possessive adjectives placed before the noun: mo (my), do (your), a (his/her), and so on.

Both systems interact with the mutation rules you are learning. Possessive adjectives trigger specific mutations — mo and do cause lenition, a (his) causes lenition, a (her) puts h before vowels, and ár (our) causes eclipsis. These are predictable and consistent patterns.

Understanding possession is key to talking about family, belongings, and relationships — some of the most common everyday topics.

How It Works

Possession with ag (having)

Irish	English
Tá carr agam.	I have a car.
Tá leabhar agat.	You have a book.
Tá madra aige.	He has a dog.
Tá cat aici.	She has a cat.
Tá teach againn.	We have a house.
Tá airgead agaibh.	You (pl.) have money.
Tá páistí acu.	They have children.

Possessive adjectives

Person	Adjective	Mutation	Example
my	mo	lenition	mo theach (my house)
your (sg.)	do	lenition	do charr (your car)
his	a	lenition	a mháthair (his mother)
her	a	h before vowels	a hathair (her father)
our	ár	eclipsis	ár dteach (our house)
your (pl.)	bhur	eclipsis	bhur gcairde (your friends)
their	a	eclipsis	a dteach (their house)

Note: "His," "her," and "their" all use a but trigger different mutations, which is how you tell them apart.

Examples in Context

Irish	English	Note
Tá carr agam.	I have a car.	ag-possession
mo theach	my house	mo + lenition
do charr	your car	do + lenition
a mháthair (his)	his mother	a + lenition = his
a máthair (her)	her mother	a + no mutation on m = her
a hathair (her)	her father	a + h before vowel = her
ár dteach	our house	ár + eclipsis
a dteach (their)	their house	a + eclipsis = their
An bhfuil madra agat?	Do you have a dog?	Question with ag
Níl airgead agam.	I don't have money.	Negative with ag

Common Mistakes

Confusing his/her/their (all "a")

• Wrong: Not knowing whether a mháthair is "his" or "her"
• Right: a mháthair (lenition = his), a máthair (no mutation on m = her)
• Why: All three possessives are spelled a, but they trigger different mutations. Lenition = his, h-before-vowels = her, eclipsis = their.

Forgetting lenition after mo and do

• Wrong: mo teach
• Right: mo theach
• Why: Mo and do always trigger lenition on the following noun.

Saying "I have" with is instead of tá + ag

• Wrong: Is agam carr
• Right: Tá carr agam
• Why: Possession uses tá + noun + prepositional pronoun, not the copula.

Practice Tips

1. List ten things you own and express each with "Tá ... agam": car, phone, book, house, etc. Then practice the negative: "Níl ... agam."
2. Practice the possessive adjectives with teach (house): mo theach, do theach, a theach (his), a teach (her), ár dteach, bhur dteach, a dteach (their). The mutations make the meaning clear.

Related Concepts

• Family and People — possession is essential for talking about family members