"I answer the woman."
Translation:Freagraím an bhean.
Technically, it's the accusative case, but because the accusative form is always the same as the nominative form, and the rules of lenition and eclipsis for the accusative are the same as for the nominative, there is no distinct "accusative form", and nobody bothers to mention the accusative.
The first person singular and plural have synthetic verb forms, which means the verb is inflected to include the subject.
Different verbs handle the details differently, but if it ends with -m then it's the "I" form (for "mé") and if it ends in -mid it's the "we" form (for "muid").