Can someone explain the attributive adjective, please? Like how and why the spelling changes, and whatever else. I looked on gnag, but didn't really understand, so it would help if you weren't too technical.
An adjective can be used either as an attribute or as a predicate. For example, in “There are the wet ducks”, “wet” is an attribute of a particular set of ducks, so it’s an attributive adjective. In “The ducks are wet”, “wet” is a predicate of “the ducks” — “wet” states something about the ducks rather than qualifies which ducks are being discussed — so it’s a predicative adjective.
In Irish, predicate adjectives are not declined, eclipsed, or lenited (excepting a few instances in which lenition is applied). Attributive adjectives can be declined, eclipsed, or lenited, depending upon the adjectives and the noun that they qualify. Thus, in Tá na lachain fhliucha, the attributive adjective fliuch is both lenited (because it qualifies a plural noun that ends with a slender consonant) and declined (because a nominative plural noun requires fliucha, the nominative plural form of fliuch); but in Tá na lachain fliuch, the predicative adjective fliuch remains undeclined and unmutated.