Quote:
I've noticed that sometimes people use analytic verb forms (ex. tá mé, deir mé, ól mé, etc...) all the time, while others use synthetic forms (táim, ólaim, etc...).
So what's the deal? Are there rules governing this usage? Is it a dialectical thing? What's the preference of most fluent speakers (native or 2nd language)?
it's mainly a dialectal thing.
Certain synthetic forms are only used in Munster ; others exist everywhere or almost ; certain exist only in certain places.
Actually the dialect that uses the biggest number and the most often these synthetic forms is Munster Irish.
In Ulster, people don't use many of them, only a few.
Táim is Munster
ólaim exists everywhere (but in certain Ulster dialects you can also hear ólann mé)
I don't think "ól mé" exists

In the present tense, the synthetic form with -(a)im is usual everywhere (except in the verb "tá": "táim" is Munster, Connachta and Ulster have "tá mé").