Anyone can do a bad Irish accent: Just go “toity toity toity” and hop around on one foot. But last night, Saoirse “rhymes with inertia” Ronan joined Stephen Colbert to teach him how to talk like a real Irish person. Step one: Stop squeaking like a leprechaun. Step two: Say actual words. Step three — and this is the hard one — figure out what all those letters are doing. Why is there an O and an A and I so close together? And why does B + H = V? The Brooklyn star will explain it all, or her name isn’t Suarez Ronan.