Is this correct, The sun is yellow, is Aurinko on Keltinen. That's correct, but just 2 typos at word keltainen. Missing a and it should not be capitalized.       example* a book is Kirja Kirjat=plural. Is there a suffix that refers to the like the book or would it be same as Kirja?   No there's not, a book and the book are same kirja. In Finnish there isn't that consept at all. Some occasions word se (it/that) may be used to refer one certain item.