klar - refers to a masculine or feminine noun (ex. stol, hun) klart - refers to a neuter noun (ex. bord, det) klare - refers to a plural noun (ex. stoler, border, vi)
Most adjectives follow the same pattern.
Hold in there. I finally got the pattern down and now I'm working on remembering to use it and figuring out which don't change (ex. lilla) and which follow different rules (esp. liten)