Y Fannod - The Article
Welsh does not use the indefinite article (a/an) but there are three forms of the definite article (the) - y , yr and 'r . The rules governing their use are presented below.
(1) y is used before consonants. *
y drws - the door
y ferch - the girl
(2) yr is used before vowels (including 'w' and 'y') and before h .
yr ystafell - the room
yr afon - the river
yr hosan - the sock
(3) ’r is used after a word ending in a vowel - it does not matter if the word after it starts with a vowel or a consonant.
Mae’r bechgyn - The boys are
Mae’r afon - The river is
* Note on Soft Mutation - "Using the definite article y ( yr before a vowel) causes a feminine noun to undergo a soft mutation (except if it begins with ll- or rh- )."