So, being a beginner Gaelic speaker, I've run into this Leibh/leat thing quite a few times. An example would be the phrase goodbye. Apparently it can be said 'Mar sin leibh' or 'Mar sin leat'. So what's the difference between leibh and leat? As a French speaker I assume it's kind of like the difference between 'Bon' (good) and 'bien' (well). Any thoughts?