Stem Changes in the Past

Level 2

Finnish uses the marker -i- for the past tense. This triggers various vowel changes (like a → o or a dropping) and can cause a t → s shift in specific Type 1 and Type 4 verbs.

How It Works

To form the past tense, you start with the verb's inflectional stem and add the marker -i- followed by personal endings (-n, -t, -mme, -tte, -vat/-vät).

Important: In the 3rd person singular, the final vowel is never doubled. While the present tense is hän ottaa, the past tense is always hän otti.

1. Vowel Changes in Type 1 Verbs (-a/-ä)

  • -a drops in two-syllable verbs if the first syllable’s vowel is o or u, including diphthongs beginning with them: ottaa → otin.
  • -a drops in verbs with three or more syllables: rakastaa → rakastin.
  • -a changes to -o in two-syllable verbs commonly when the first syllable begins its vowel sequence with a, e, i (including au, ei, ai): antaa → annoin, laulaa → lauloin.
  • -ä always drops: elää → elin.
  • -e and -i drop: lukea → luin, oppia → opin.
  • -o, -ö, -u and -y remain: The stem vowel does not drop; the -i- is simply added to form a diphthong: sanoa → sanoin, säilöä → säilöin, puhua → puhuin, kysyä → kysyin.

Consonant Gradation in Type 1: Just like in the present tense, consonant gradation depends on whether the syllable is open or closed. Use the weak grade for 1st and 2nd persons (minä otin) and the strong grade for the 3rd person (hän otti, he ottivat).

2. The t → s Shift
In Type 1 verbs ending in -taa/-tää, the t changes to s only when the final vowel drops to create a -ti- combination, and is preceded by l, n, r or a long vowel/diphthong: rakentaa → rakensin, löytää → löysin, tietää → tiesin. This shift does not occur if the final -a changes to -o (e.g., antaa → annoin). There are also exceptions with long vowels or diphthongs that take the weak grade d instead of s, such as hoitaa → hoidin. A common exception is the verb tuntea (to feel/know), which also undergoes this shift (tuntea → tunsin).

3. Type 2 Verbs (-da/-dä)

  • Long vowels shorten: saada → sain.
  • Diphthongs ending in a vowel other than i lose their first vowel: syödä → söin, juoda → join. (Diphthongs ending in i keep their first vowel: voida → voin).
  • Irregular verbs: käydä → kävin, tehdä → tein, nähdä → näin.

4. Type 3 Verbs (-la/-lä, -na/-nä, -ra/-rä, -sta/-stä)
Take the present stem, drop the final -e, and add -i-: tulla (stem tule-) → tulin, pestä (stem pese-) → pesin. The common verb olla (to be) is a regular Type 3 verb in the past tense: its present stem ole- drops the -e to become oli- (olin, olit, oli, olimme, olitte, olivat).

5. Type 4, 5 & 6 Verbs

  • Type 4: Drop the final vowel of the present stem and add -si-: haluta (stem halua-) → halusi.
  • Type 5: The -i- marker causes the -e- of the -tse- stem to drop: tarvita (stem tarvitse-) → tarvitsin.
  • Type 6: Drop the final -e from the present tense stem and add -i-: kylmetä (stem kylmene-) → kylmenin.

6. The Negative Past Tense
To form the negative past tense, you do not use the -i- marker. Instead, use the negative verb (en, et, ei, emme, ette, eivät) followed by the active past participle of the main verb. The participle ends in -nut/-nyt for singular subjects and -neet for plural subjects: minä en ottanut (I didn't take), he eivät ottaneet (they didn't take).

Examples (6)

  1. Minä otin kirjan pöydältä.

    I took the book from the table.

    Word by Word: I took book from-table.

    The verb 'ottaa' uses the weak grade 'ot-' for the 1st person. The final 'a' drops because the first syllable contains 'o'.

  2. Hän otti kirjan pöydältä.

    He/she took the book from the table.

    Word by Word: He/she took book from-table.

    In the 3rd person singular, the strong grade 'ott-' is used. Note that unlike the present tense (ottaa), the final vowel is never doubled in the past tense (otti).

  3. Me annoimme heille lahjan.

    We gave them a gift.

    Word by Word: We gave to-them gift.

    In two-syllable verbs like 'antaa', the final 'a' changes to 'o' in this common stem pattern. The guideline concerns the first vowel, including a in au: laulaa → lauloin. It does not mean every diphthong containing i triggers o: muistaa → muistin and hoitaa → hoidin.

  4. Hän halusi uuden auton.

    He/she wanted a new car.

    Word by Word: He/she wanted new car.

    For Type 4 verbs, the past tense marker is '-i-'. The stem's 't' changes to 's' before the 'i', which often looks like replacing the final vowel of the present stem with '-si-' (halua- becomes halusi).

  5. Tarvitsin uuden tietokoneen.

    I needed a new computer.

    Word by Word: I-needed new computer.

    In Type 5 verbs like 'tarvita', the present stem ends in '-tse-'. The past marker '-i-' causes the final '-e-' to drop, resulting in '-tsi-'.

  6. Kylmenimme ulkona.

    We got cold outside.

    Word by Word: We-got-cold outside.

    Type 6 verbs like 'kylmetä' drop the final e of the present stem kylmene- before adding the past i: kylmeni-, kylmenimme.

Common Mistakes

  • Over-applying the -a to -o change.

    Minä ottoin kirjan.
    Minä otin kirjan.

    Use the first vowel of the first syllable as the useful two-syllable -aa guideline, not any vowel inside a diphthong. Compare laulaa → lauloin with muistaa → muistin and hoitaa → hoidin. Learn verb-specific exceptions separately.

  • Forgetting the t → s shift.

    Minä tietin sen.
    Minä tiesin sen.

    Verbs like 'tietää' and 'rakentaa' undergo a consonant shift where 't' becomes 's' in the past tense.

  • Using the past stem in negative sentences.

    En tiesin.
    En tiennyt.

    The negative past does not use the '-i-' marker. It uses the negative verb plus the past participle (-nut/-nyt).

How It Connects

Tap a pattern to see what it builds on and what it leads to.

Stem Changes in the PastLevel 2

Learn This First

To understand how stems change in the past tense, you first need to know the basic past tense marker -i-. You also need to be familiar with how verb stems behave in the present tense (Verb Type 1) and how consonant gradation affects these stems, as the past tense marker often triggers the 'weak' grade.

Words in This Pattern

-i-