"I speak English."
When you say in English "I speak Irish", in Ireland we say "I have Irish". But in Irish is there the equivalent?
Maybe "Tá gaeilge agam."
In Irish, Tá x agam is the way to say "I speak x". Unless you're saying something like Labhraím Béarla ag m'obair (I speak Irish at my work). But yes, these sentences are incorrect to just say you are able to speak the language.
In the duolingo flash card app it didn't accept this, and would only take larabhim béarla as correct. Is this just a difference in regional dialect, or something else?