Good exercise. I always mix up which possessive gets a lenition.
So "his" gets it when the word starts with a consonant, but it doesn't if the word starts with a vowel? Vice versa for "her"?
Yes, a (“his”) lenites the governed noun, and a (“her”) prefixes an H to a governed noun beginning with a vowel. Note that the latter case is not an example of lenition, since only certain consonants can be lenited.
So if the word starts with a constant her doesnt get a séimhiú (h) but his does and if the word strarts with a vowel her starts with h and his doesnt?
Typo: consonant (bcdfglmnprst) Yes, and you want to say their something, you eclipse (put urú on) the first letter of the next word.
Ugh I'm confused. I understand lenition for genitive cases, but how the heck do you tell the difference between that and lenition after vowels?
I'm not sure what you're asking.
There's only one genitive case in Irish, and the only genitive there is that masculine singular nouns are lenited after the definite article. Did you mean something else?
There are no vowels that cause lenition just because they're vowels.
The three 'a''s above are the Irish words for his, her, and their. a bhád (his boat - lenited), a bád (her boat - nothing happens, but if the noun had started with a vowel, it would add an h to the beginning: a hathair), a mbád (their boat - eclipsed)
I have a feeling that this isn't what you were asking, though. If you give some examples, I'll try again to answer your question.
Oh, I see. No, in standard Irish, urú does nothing to a word starting with 's.' A sibliní = their siblings
Interesting. Would you mind telling me where you checked this and whether your source was describing a particular dialect?
I just checked. It's not urú. It is another unnamed mutation that only happens to feminine nouns after the definite article which is preceded by a preposition.
Why does it sound like she's saying "a hiblíní"? A mistake? A rule I missed? A peculiarity in the Connacht dialect or Irish in general?