The last letters of a word can change when an ending is added to the word. That’s why words are divided into word types (sanatyyppi).You’ll recognize the word type by the last letters of the base form of the word.
5.1 Word types ending in vowels
- inflection of words ending in i and e
5.2 Word types ending in consonants
- inflection of words ending in nen, in, as, us