Agat vs Agam?
You're going to have to give us more information. What about them? Like, what's the difference? agam = ag mé; agat = ag tú.
"Tá madra agat" means "you have a dog" while "Tá madra agam" means "I have a dog". It's important to note that "agat" only works as the singular "you"; I forget which one's the plural "you".
I know that Agam is for me, Agat is for singular you, Aige is for he, Aici is for she and that Againn is for us, and now that you just mentioned it I know that Agaibh is for plural you, so which one's Acu? Is it for them?