English needs a helper verb to say that you caused an action: make the child eat, have a house built, get the horses watered. Finnish folds the causation straight into the verb with -ttaa / -ttää. Syödä is "to eat"; syöttää is "to make eat" = "to feed." Oppia is "to learn"; opettaa is "to make learn" = "to teach." The suffix does not just change the meaning — it changes the grammar of the sentence, adding a new participant (the causer) and pushing the original doer down into an object. This is the mirror image of the valency-lowering reflexive/automative -utua: one suffix adds an agent, the other removes one.
The core logic: add a causer, demote the doer
Start from a simple intransitive sentence and watch the arithmetic. Lapsi syö ("the child eats") has one participant. Add -ttää and you introduce a causer who makes the eating happen; the original eater is now the thing being fed, so it becomes the object.
| Base clause | Causative clause |
|---|---|
| Lapsi syö. "The child eats." | Äiti syöttää lasta. "Mother feeds the child." |
| Hevonen juo. "The horse drinks." | Renki juottaa hevosta. "The farmhand waters the horse." |
| Vauva nukkuu. "The baby sleeps." | Isä nukuttaa vauvaa. "Dad puts the baby to sleep." |
Notice the demotion: lapsi (subject) becomes lasta (partitive object). The causer takes the vacated subject slot. That single shift is the whole point of the suffix — it is a valency-raiser, not just a vocabulary change.
Lapsi ei osaa vielä syödä itse, joten äiti syöttää häntä lusikalla.
The child can't eat on their own yet, so the mother feeds them with a spoon.
Juotin hevoset lähteellä ennen kuin jatkoimme matkaa.
I watered the horses at the spring before we carried on.
Yritän nukuttaa vauvaa, mutta se ei millään suostu nukahtamaan.
I'm trying to get the baby to sleep, but it just won't drop off.
The star example is oppia → opettaa. "To learn" and "to teach" look like unrelated words in English; in Finnish, teaching is transparently "making someone learn."
Isoisä opetti minut uimaan, kun olin viisivuotias.
Grandpa taught me to swim when I was five.
The "have it done" reading
When the base is already transitive, the causative means "have / get something done by someone else." The person who actually does the work — the causee — is marked with the adessive (-lla / -llä, "by").
| Base | Causative | Meaning |
|---|---|---|
| tehdä "to do" | teettää | to have done |
| rakentaa "to build" | rakennuttaa | to have built |
| korjata "to repair" | korjauttaa | to have repaired |
| pestä "to wash" | pesettää | to have washed |
Teetin uudet verhot ompelijalla, koska valmiita ei löytynyt.
I had new curtains made by a seamstress, because there were no ready-made ones.
He rakennuttivat talon arkkitehdin piirustusten mukaan.
They had a house built according to an architect's drawings.
The contrast with the plain verb is exactly the English do it myself vs have it done: tein työn itse ("I did the work myself") but teetin työn ammattilaisella ("I had the work done by a professional").
Not only from verbs: causatives from adjectives
Many causatives are built on adjectives, meaning "make (something) X." Here the family broadens beyond -ttaa into the related -staa / -stää and -ntaa / -ntää.
| Adjective | Causative verb | English |
|---|---|---|
| lämmin "warm" | lämmittää | to heat, warm up |
| puhdas "clean" | puhdistaa | to clean |
| tyhjä "empty" | tyhjentää | to empty |
| pitkä "long" | pidentää | to lengthen |
| lyhyt "short" | lyhentää | to shorten |
Lämmitä sauna valmiiksi, niin mennään uinnin jälkeen löylyyn.
Heat the sauna up, and we'll take a steam after the swim.
When the causative has quietly become an everyday word
Here is the honest complication: a huge number of -ttaa verbs lexicalised long ago and no longer feel causative at all. Opettaa ("to teach"), kasvattaa ("to raise, bring up"), lämmittää ("to heat") are just ordinary transitive verbs to a native speaker — nobody hears "make grow" inside kasvattaa. Do not, therefore, expect every -ttaa verb to translate as a literal "make X." Some are live causatives you can coin on the spot (juoksuttaa "to make (someone) run"); others are frozen dictionary entries.
A few pairs are downright irregular. Palaa ("to burn, be on fire," intransitive) has the transitive causative polttaa ("to burn something, to smoke") — with a vowel change a → o that no rule predicts. You simply learn it.
Naapurin lapsia kasvatetaan hyvin tiukasti.
The neighbours' children are raised very strictly.
Nuotio paloi hitaasti, ja poltimme siinä kaikki vanhat paperit.
The campfire burned slowly, and we burned all the old papers on it.
The suffix can also stack and colour an emotion. Naurattaa (from nauraa "to laugh") is used impersonally to mean "feel like laughing": the laughter is caused in you.
Minua alkoi naurattaa kesken kokouksen, enkä saanut sitä millään loppumaan.
I started to feel like laughing in the middle of the meeting, and just couldn't stop.
Common Mistakes
❌ Äiti tekee vauvan nukkua.
Incorrect — this calques English 'make the baby sleep'; Finnish has the causative verb nukuttaa.
✅ Äiti nukuttaa vauvaa.
Mother is getting the baby to sleep.
❌ Äiti syötää lasta.
Incorrect — the causative geminates the t: syöttää, not *syötää.
✅ Äiti syöttää lasta.
Mother is feeding the child.
❌ Rakensin talon isolla rakennusfirmalla.
Incorrect — if a firm did the building, you didn't 'build'; you 'had it built': rakennutin.
✅ Rakennutin talon isolla rakennusfirmalla.
I had the house built by a large construction firm.
❌ Minua alkoi naurettaa.
Incorrect — naura- is a back-vowel stem, so harmony gives naurattaa, never *naurettaa.
✅ Minua alkoi naurattaa.
I started to feel like laughing.
❌ Haluan opettaa lisää suomea itselleni.
Incorrect if you mean to study — opettaa is 'to teach' (make others learn); to learn is oppia.
✅ Haluan oppia lisää suomea.
I want to learn more Finnish.
Key Takeaways
- -ttaa / -ttää adds "make / have someone do it," raising valency: lapsi syö → äiti syöttää lasta.
- With a transitive base it means "have it done," and the doer takes the adessive: teetin työn ammattilaisella.
- From adjectives it means "make X," spreading into -staa and -ntaa: puhdistaa, tyhjentää, pidentää.
- Many -ttaa verbs have lexicalised (opettaa, kasvattaa) and no longer feel causative; a few are irregular (palaa → polttaa).
- Watch gemination (syö → syöttää), gradation (rakentaa → rakennuttaa), and harmony (naurattaa vs lämmittää).
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Start learning Finnish→Related Topics
- Reflexive/Automative Verbs: -utua/-ytyäB2 — The suffix -utua/-ytyä lowers valency: pukea → pukeutua 'get dressed', avata → avautua 'open by itself', muuttaa → muuttua 'change'.
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- Deriving New Words: An OverviewA2 — How Finnish builds new words from roots plus derivational suffixes — the main suffix families, why the language grows vocabulary this way, and how to parse and predict.
- Reflexive and Automative Verbs: -utuaB2 — Finnish verbs that turn an action back on the subject (peseytyä 'wash oneself') or let it happen on its own (avautua 'open') — and why they take no object.