The Inflections in Old Irish

In old Irish, you will get a lot of like internal changes in the noun itself. It's almost comparable to something like Sunday that happens in Sanskrit where it's just these words are next to each other so, you know, the sounds are going to interact. This is true for verb forms, this is true for nouns and pronouns and of course prepositions and all sorts of fun things. The only clue you have is the sound that the next word starts with.