For the life of me I can't remember if masculine nouns starting with a vowel take an initial "t" after a preposition. For example, is it 'ag an am seo" or "ag an t-am seo"? "Ar an idirlíon" or "ar an t-idirlíon"? My inclination is to say "no...they're in the dative case" but I'm second-guessing myself.

Redwolf

Your inclination is right.
There is never ever a "t" prefixed to nouns starting with vowels in dative case.
ag an am sin, ar an éan,

But some prepositions don't require dative case but accusative case ( gan, idir, ach, ná, mar) or nominative case (go dtí, seachas, murach)
Here a prefixed t is required:
idir an t-asal agus an t-éan
go dtí an t-am sin, go dtí an t-éan
murach an t-am sin, seachas an t-éan

Thanks! I think I'd find it easier to remember if Irish nouns changed significantly in the dative and accusative cases.

Redwolf

I have read all the articles and feel that it is a great benefit. Can be used.

Huh?

Tewtertwee is a bot that posts nonsense, here and on other forums. Should be blocked.

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Pages I made:
(These are unfortunately offline for the near future, but they'll be back!)

• Teaching Young Kids Irish (It's just my notes, a work in progress.)
• CD transcript and translations for the book Learning Irish