The Possessive Adjective.
519. A possessive adjective can never be used without a noun: as, her father and his, a h‑aṫair agus a aṫair.
520. The possessive adjectives always precede their nouns: as, mo ṁáṫair, my mother.
521. The possessives mo, my; do, thy; and a, his, aspirate the initial of their nouns; ár, our; ḃur, your; and a, their, cause eclipsis: as, a ḋán, his poem; do ṁáṫair, thy mother; a dán, her poem ; a ndán, their poem.
522. If a noun begins with a vowel, mo, my, and do, thy, become m’ and d’ (t or ṫ); a, his, has no effect; a, her, prefixes h; and a, their, prefixes n; ár, our, and ḃur, your, also prefix n to vowels: as, a aṫair, his father; a h‑aṫair, her father; a n‑aṫair, their father; m’ḟear, my husband; d’eun, your bird; ár n‑arán laeṫeaṁail, our daily bread; ḃur n‑aḃrán, your song.
523. The possessive adjectives, when compounded with prepositions (see par. 186), have the same influence over the initials of their nouns as they have in their uncompounded state: as, dom ṁáṫair, to my mother; óm ṫír, from my country.