Questions & Answers about Iäkkään kuninkaan täytyi lähteä.
How is the adjective iäkäs formed from the noun ikä?
The suffix -käs (or -kas) is added to a noun to mean having an abundance of or being characterized by that thing. Adding it to ikä (age) creates iäkäs (elderly). Notice that the root word undergoes consonant gradation: the k in ikä disappears, leaving the stem iä- before the suffix is attached.
Why is the adjective spelled with a double kk in iäkkään?
Adjectives derived with the -kas or -käs suffix undergo reverse consonant gradation. The basic nominative form iäkäs has a single weak k. When we add an ending like the genitive -n, the stem takes the strong grade with a double kk and the final vowel lengthens, resulting in iäkkään.
Why are the words iäkkään kuninkaan in the genitive case?
They are the subject of the necessity verb täytyi (had to). In Finnish, verbs expressing obligation, such as täytyä and pitää, require their subject to be in the genitive case. Because kuninkaan is genitive, its modifying adjective must agree and also be in the genitive.
Both iäkäs and kuningas end in a vowel plus -s. Do they follow the same declension rules?