nt-nn, nk-ng, mp-mm, lt-ll, rt-rr

Gradation After a Consonant

Level 3

Assimilatory qualitative gradation occurs when clusters like nt, nk, mp, lt, and rt change to nn, ng, mm, ll, and rr in a closed syllable.

How It Works

This pattern is a specific subset of qualitative gradation caused by assimilation. Consonant gradation only affects the stops P, T, and K. The five patterns taught here are mp/mm and nk/ng after nasals, plus nt/nn, lt/ll, and rt/rr for t after n, l, or r. Do not generalize the liquid pattern to lp or lk; they have different alternations. It occurs at the onset of the syllable being closed or opened by a suffix.

The Syllable Rule:
Gradation occurs when the syllable that the gradating consonant begins is closed by a consonant (e.g., ran-nan). This open/closed relation describes common direct-gradation forms such as ranta : rannan. It is a historical guide, not a complete algorithm for every modern form: vowel stems, lost consonants, illatives, and possessive suffixes can obscure it.

Standard Gradation (Strong to Weak):

  • nt → nn: ranta (shore) → rannan
  • nk → ng: Helsinki → Helsingin (Note: the 'n' in 'nk' is already pronounced as /ŋ/, and 'ng' is a long /ŋː/ sound)
  • mp → mm: lampi (pond) → lammen
  • lt → ll: ilta (evening) → illan
  • rt → rr: kerta (time) → kerran

Inverse Gradation (Weak to Strong):
Inverse gradation applies predictably to specific word groups, such as Verb Type 6 and nouns ending in -e or -as/-äs, where the dictionary form is weak and the inflected forms (like genitive or illative) are strong:

  • nn → nt: ranne (wrist) → ranteen
  • ng → nk: rengas (ring/tire) → renkaan
  • mm → mp: lämmetä (to warm up) → lämpenen
  • ll → lt: allas (pool/basin) → altaan
  • rr → rt: porras (stair/step) → portaan

Verb Conjugation:
In Verb Type 1, the 1st and 2nd person forms are weak because the syllable the gradating consonant begins is closed by -n, -t, -mme, or -tte. The 3rd person forms remain strong because the suffix begins with a vowel (or in the case of the 3rd person plural, the suffix begins with a consonant but acts as the onset for the next syllable), leaving the gradating syllable open: minä an-nan (weak, 'n' begins the closed syllable '-nan') vs. hän an-taa (strong, 't' begins the open syllable '-taa', 'antaa' means 'to give').

More Inverse Verb Examples
Type 3 kuunnella → kuuntelen changes nn to nt in the personal stem. Type 4 kammata → kampaan changes mm to mp. These belong to the same families as ranne → ranteen and lämmetä → lämpenen. Learn whether the individual verb gradates rather than replacing every nn or mm in that verb type.

Examples (6)

  1. Helsinki : Helsingissä

    Helsinki : in Helsinki

    The 'nk' in Helsinki changes to 'ng' when the inessive ending -ssä closes the syllable.

  2. Minä annan sinulle kirjan.

    I give you a book.

    Word by Word: I give to-you book.

    The verb 'antaa' (to give) weakens to 'annan' in the first person singular because the ending -n closes the syllable.

  3. Käymme rannalla joka ilta.

    We go to the shore every evening.

    Word by Word: We-go shore-on every evening.

    In 'rannalla', the 'nt' weakens to 'nn' because the adessive ending -lla closes the syllable.

  4. Lampi on kaunis. Uin lammen rannalla.

    The pond is beautiful. I swim by the shore of the pond.

    Word by Word: Pond is beautiful. I-swim pond's shore-on.

    The 'mp' in 'lampi' changes to 'mm' in the genitive form 'lammen'.

  5. Hän kääntää kirjan suomeksi.

    He/she translates the book into Finnish.

    Word by Word: He translates book Finnish-into.

    In the 3rd person singular, the syllable remains open (kään-tää) because it ends in a vowel, so the strong grade 'nt' is kept.

  6. Ranne on kipeä. Ranteen luu on murtunut.

    The wrist is sore. A bone in the wrist is broken.

    Word by Word: Wrist is sore. Wrist’s bone is broken.

    This is inverse gradation: the basic form 'ranne' is weak (nn), but the genitive 'ranteen' becomes strong (nt).

Common Mistakes

  • Pronouncing 'ng' with a hard 'g' sound.

    Helsing-gin
    Helsingin

    In Finnish, 'ng' is a single long nasal sound /ŋː/ (like the 'ng' in 'singing'). There is no hard 'g' sound like in the English word 'finger'.

  • Gradating 'st', 'sk', or 'tk' clusters.

    postissa -> possissa
    postissa

    Clusters starting with 's' or 't' (like st, sk, tk) are 'protected' and never undergo gradation.

  • Applying gradation to the illative case.

    rannaan
    rantaan

    The illative case (into) is a historical exception to the closed-syllable gradation rule. Even though the syllable is closed, the strong grade is kept.

How It Connects

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

nt-nn, nk-ng, mp-mm, lt-ll, rt-rrLevel 3Gradation After a Consonant

Learn This First

To understand how consonant clusters like 'nt' or 'mp' change, you first need to understand the general concept of consonant gradation (strong vs. weak grades) and how Finnish uses double consonants to distinguish sounds. This specific pattern explains how the final stop (k, p, t) in a cluster is replaced by doubling the preceding nasal or liquid consonant.

Learn Next

Patterns that build on this one.