Vowel Harmony

01

The Two Groups

• Back vowels: a, o, u
• Front vowels: ä, ö, y
• Neutral vowels: e, i - these combine freely with either group

A word built on back vowels takes back-vowel endings; a word built on front vowels takes front-vowel endings. The classic minimal pair shows the same case ending in its two shapes:

• talossa

  in the house (back-vowel word → -ssa)

• kylässä

  in the village (front-vowel word → -ssä)

02

It Governs Every Ending

The rule applies to case endings, personal endings, and the question particle alike. You never choose the vowel consciously - it is fixed by the stem.

• He ottavat kahvia.

  They take coffee. (back → -vat)

• He syövät leipää.

  They eat bread. (front → -vät)

• Asutko? vs. Syötkö?

  the question particle: -ko (back) vs. -kö (front)

• talossa vs. metsässä

  in the house vs. in the forest

03

Neutral Vowels

A word containing only the neutral vowels e and i counts as a front-vowel word and takes front endings.

• meri → meressä

  sea → in the sea

• kivi → kivessä

  stone → in the stone

04

Compound Words

In a compound word, harmony is judged from the last part only, so the two halves of the word can belong to different vowel groups. This is why a long compound may contain both back and front vowels and still be correct.

• työpöytä → työpöydällä

  desk → on the desk (the ending follows "pöytä", front)

05

Why It Matters

Choosing the wrong vowel group does not usually block understanding, but it is immediately noticeable. Getting harmony right is one of the simplest ways to make your Finnish sound natural.