-n (instruktiivi)

Instructive (-n)

Level 5

The instructive case (-n) indicates how something is done or what tool is used. In modern Finnish, it is mostly found in set phrases (like 'käsin' - by hand) and in the second infinitive of verbs (like 'itkien' - crying).

How It Works

The instructive case is one of the oldest cases in Finnish, but its role has largely been taken over by the adessive case (-lla/-llä).

1. Formation
The instructive is formed by adding -n to the plural stem. This results in the ending -in. For example, käsi (hand) → käsi- (stem) → käsi-i-n → käsin.

2. Usage in Nouns
In modern Finnish, you should not try to invent new instructive forms. It is used in specific, fossilized expressions, often involving body parts or natural means:

  • käsin (by hand)
  • omin silmin (with one's own eyes)
  • paljain jaloin (barefoot)
  • monin tavoin (in many ways)

A rare singular exception is jalan (on foot), which looks identical to the genitive singular.

3. Adjective Agreement
If an adjective describes an instructive noun, it must also be in the instructive plural: suurin ponnistuksin (with great efforts).

4. Verbal Use
While rare for nouns, the instructive is fully productive in the second infinitive to describe the manner of an action (e.g., hymyillen - smiling).

Examples (5)

  1. Näin sen omin silmin.

    I saw it with my own eyes.

    Word by Word: I saw it own-with eyes-with.

    A very common fixed expression using the plural instructive for both the adjective and the noun.

  2. Hän tuli kotiin jalan.

    He came home on foot.

    Word by Word: He came home foot-by.

    'Jalan' is one of the few singular instructive forms still in common use.

  3. Lapset leikkivät rannalla paljain jaloin.

    The children were playing on the beach barefoot.

    Word by Word: Children played beach-on bare-with feet-with.

    'Paljain jaloin' (with bare feet) is the standard way to say barefoot in Finnish.

  4. Tein sen aivan omin käsin.

    I did it entirely with my own hands.

    Word by Word: I did it quite own-with hands-with.

    Used to emphasize that no tools or outside help were used.

  5. Asiaa voi tarkastella monin eri tavoin.

    The matter can be viewed in many different ways.

    Word by Word: Matter-partitive can view many-with different-with ways-with.

    A formal expression often used in writing or speeches.

Common Mistakes

  • Using the instructive for modern tools instead of the adessive.

    Kirjoitan kynin.
    Kirjoitan kynällä.

    The instructive 'kynin' sounds archaic or poetic. For modern tools like a pen, always use the adessive case.

  • Forgetting adjective agreement.

    Näin sen oma silmin.
    Näin sen omin silmin.

    In the instructive case, the adjective must match the noun's case and number. 'Oma' must become 'omin'.

How It Connects

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-n (instruktiivi)Level 5Instructive (-n)

Learn This First

To understand the instructive case, you need to be familiar with the plural stem (since it is almost always plural) and the basic -n case ending. Because it is a rare case primarily found in fixed expressions, a general grasp of the Finnish case system helps in identifying its function as a marker of 'means' or 'manner'.

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Words in This Pattern

-n