Fossilised Instructive Forms
The instructive case (ending in -n) is a 'frozen' grammatical case in modern Finnish. While it once functioned to show how something was done, it is now mostly found in fixed idioms like jalan (on foot) or omin käsin (with one's own hands).
How It Works
The instructive case expresses the means, manner, or instrument of an action. In contemporary Finnish, its usage is divided into four main categories:
- Fossilized Nouns: These are set phrases involving body parts or abstract concepts. Common examples include monin tavoin (in many ways), paljain jaloin (barefoot), and kynsin hampain (tooth and nail).
- Adverbs: Many words originally in the instructive are now considered independent adverbs, such as aivan (completely), samoin (likewise), and tarkoin (carefully). This case is also the source of the -in ending in comparative adverbs (e.g., kauniimmin).
- Temporal Usage: The instructive appears in certain expressions to indicate frequency or recurring time, such as aamuin (in the mornings), illoin (in the evenings), or öin (at nights).
- Verbal Productivity: While nouns are frozen, the instructive remains fully active in the second infinitive to describe how an action is performed (e.g., itkien - crying).
Morphology: The ending is -n attached to the plural stem. For example: käsi (hand) → käsi- (stem) → käsi-i-n → käsin. Note that while the singular instructive is rare for nouns (with jalan being the most prominent survivor), it is very common in high-frequency adverbs like aivan and ihan.
Examples (6)
- Tein sen omin käsin.
I did it with my own hands.
Word by Word: I-did it own-with hands-with.
This uses the plural instructive of 'oma' (own) and 'käsi' (hand) to show the instrument of the action.
- Lapset juoksivat pihalla paljain jaloin.
The children ran in the yard barefoot.
Word by Word: Children ran yard-on bare-with feet-with.
The phrase 'paljain jaloin' (with bare feet) is a classic fossilized instructive expression.
- Asiaa on pohdittu monin tavoin.
The matter has been considered in many ways.
Word by Word: Matter-partitive has-been pondered many-in ways-in.
Here, the instructive expresses the manner or variety of the action.
- Hän tuli kotiin jalan.
He/she came home on foot.
Word by Word: He/she came home foot-by.
'Jalan' is one of the few surviving singular instructive forms of a noun used in everyday language.
- Luen lehteä aamuin illoin.
I read the newspaper mornings and evenings.
Word by Word: I-read newspaper-partitive mornings-with evenings-with.
The instructive can be used in temporal expressions to indicate recurring time or frequency.
- Otan osaa suurin suruin.
I offer my condolences with great sorrow.
Word by Word: I-take part great-with sorrows-with.
This is a formal, literary use of the instructive to express the state or manner of the speaker.
Common Mistakes
Using the Adessive case for fixed instructive idioms.
Menin sinne jalalla.Menin sinne jalan.'Jalalla' means 'with a foot' (the physical object), whereas 'jalan' is the specific idiom for the method of travel (on foot).
Failing to apply adjective agreement in the instructive.
Tein sen oma käsin.Tein sen omin käsin.In the instructive case, the adjective must agree with the noun. Both 'oma' and 'käsi' must take the plural instructive ending '-in'.
Trying to create new instructive forms for modern tools.
Kirjoitin viestin puhelimin.Kirjoitin viestin puhelimella.The instructive is not productive for nouns. For modern instruments like a phone, you must use the adessive case.
How It Connects
Learn This First
To understand archaic instructive plurals, you first need to be familiar with the basic instructive case (-n) and how plural stems are formed using the -i- marker. Since these forms are no longer productive and exist only as set expressions, understanding how Finnish uses fixed case idioms is also helpful.
- -n (instruktiivi)Instructive (-n)
The archaic instructive plural is a specific, fossilised application of the instructive case ending -n.
Level 5 - Idioms Frozen in a Case
Archaic instructive plurals function as fossilised idioms or adverbs rather than productive grammatical forms in modern Finnish.
Level 5
Related Patterns
- -lla/-lläAdessive (-lla/-llä)
The adessive is the modern, productive way to express 'by means of' for most concrete tools.
Level 1 - -ine-Comitative (-ine-)
Another rare case often confused with the instructive; it denotes accompaniment and requires a possessive suffix.
Level 5 - -enManner Infinitive (-en)
The only part of Finnish grammar where the instructive case remains fully productive and common.
Level 5 - -i- (monikon tunnus)Plural Stem (-i-)
The instructive is almost exclusively built upon the plural stem.
Level 2 - Adjectives Agree with the Noun
Crucial for the instructive, as both the modifier and the noun must carry the -in ending.
Level 1
Words in This Pattern
Practice Fossilised Instructive Forms in Bubblegum
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