When English says you should rest, you'd better book early, or it's worth trying, it is not talking about an obligation — it is giving advice. Finnish keeps advice grammatically separate from obligation. The everyday word for it is kannattaa, an impersonal verb frozen in the 3rd person singular that takes a genitive logical subject and a first infinitive. Alongside it sit two lighter phrases, on syytä ("there is reason to") and on hyvä ("it is good to"). None of them means must — that job belongs to täytyy and pitää, covered on the obligation page.
kannattaa: it's worth doing
Kannattaa is built on the same frame as täytyy: a genitive subject names the person the advice is for, the verb stays glued in the 3rd person singular, and the action follows in the first infinitive (the dictionary form).
| Genitive subject | Frozen verb | 1st infinitive |
|---|---|---|
| minun | kannattaa | levätä |
| sinun | kannattaa | varata |
| hänen | kannattaa | hakea |
| meidän | kannattaa | lähteä |
The verb never inflects for person. Minun kannattaa, sinun kannattaa, heidän kannattaa — the ending stays -aa throughout, because the subject is not the grammatical subject of kannattaa; it is a genitive standing to one side of an impersonal clause.
Sinun kannattaa levätä kunnolla ennen pitkää matkaa.
You'd better rest properly before a long trip.
Kannattaako meidän varata liput jo nyt?
Is it worth us booking the tickets already now?
Hänen kannattaa hakea sitä työpaikkaa, se sopisi hänelle täydellisesti.
She should really apply for that job; it would suit her perfectly.
You can also drop the subject entirely and give general advice. Then kannattaa means "it's worth it / it's a good idea to," addressed to no one in particular — this is how you read most signs, recipes and life tips.
Kannattaa ostaa kausikortti, jos käyt uimahallissa usein.
It's worth buying a season ticket if you go to the pool often.
ei kannata: don't bother
The negative ei kannata is one of the highest-frequency phrases in spoken Finnish. It ranges from "it's not worth it" to "there's no point" to a flat "don't bother." Note the form: negation strips the ending down to the connegative stem kannata (weak grade), so it is ei kannata, never *ei kannattaa.
Sitä leffaa ei kannata katsoa, se on ihan surkea.
That movie isn't worth watching, it's totally awful.
Ei kannata murehtia turhia, kaikki järjestyy kyllä.
No point fretting over nothing; it'll all work out.
Meidän ei kannata lähteä vielä, ruuhka on pahimmillaan.
We shouldn't leave yet; the traffic is at its worst.
kannattaisi: the softer nudge
Put kannattaa in the conditional — kannattaisi — and the advice softens from "you'd better" to "you might want to / it would probably be worth." Finns reach for this constantly to avoid sounding bossy.
Sinun kannattaisi ehkä käydä lääkärissä, jos yskä jatkuu.
You might want to see a doctor if the cough continues.
Eikö meidän kannattaisi kysyä ensin hintaa?
Wouldn't it be worth us asking the price first?
The past tense exists too and is useful for hindsight: ei olisi kannattanut lähteä ("we shouldn't have left"), kannatti tulla ("it was worth coming").
on syytä and on hyvä
Two more phrases fill out the advisability range, both taking a genitive subject (optional) and a first infinitive.
- on syytä — "there is reason to / you'd do well to." Slightly firmer and more formal than kannattaa; common in warnings and instructions (formal register).
- on hyvä — "it is good to / it's a good idea to." Gentle, general, health-and-habit flavour.
Nyt sinun on syytä olla varovainen, jää on liukasta.
Now you'd do well to be careful; the ice is slippery.
On hyvä juoda tarpeeksi vettä kuumalla ilmalla.
It's good to drink enough water in hot weather.
Matkustajien on syytä varautua viivästyksiin.
Passengers should be prepared for delays.
Advice vs obligation: keep them apart
This is the whole point of the page. English blurs the line — you should can mean gentle advice or near-command. Finnish does not blur it:
| Meaning | Finnish | Force |
|---|---|---|
| it's worth / you'd better | sinun kannattaa | recommendation |
| you might want to | sinun kannattaisi | soft suggestion |
| you'd do well to | sinun on syytä | firm advice (formal) |
| you must / you have to | sinun täytyy / pitää | obligation |
If you tell a guest sinun täytyy maistaa tätä, you have grammatically ordered them to taste it. What you meant — "you've got to try this, it's amazing" — is sinun kannattaa maistaa tätä. Reach for täytyy/pitää only when there is a real requirement.
Common Mistakes
The single biggest trap for English speakers is that kannattaa, when you conjugate it personally, is a completely different, transitive verb meaning "to support, to be in favour of, to second (a motion)." So minä kannatan does not mean "I should" — it means "I support."
❌ Minä kannatan levätä tänään.
Incorrect — 'minä kannatan' means 'I support/second'; advisability stays impersonal.
✅ Minun kannattaa levätä tänään.
I'd better rest today.
❌ Sinä kannattaat mennä lääkäriin.
Incorrect — never conjugate it for person; the frame is genitive + frozen kannattaa.
✅ Sinun kannattaa mennä lääkäriin.
You'd better go to the doctor.
❌ Sinun täytyy maistaa tätä kakkua, se on ihana.
Overkill — täytyy is 'must' (obligation), too strong for a friendly tip.
✅ Sinun kannattaa maistaa tätä kakkua, se on ihana.
You've got to try this cake, it's lovely.
❌ Ei kannattaa ostaa noin kallista.
Incorrect — the negative uses the connegative stem: ei kannata.
✅ Ei kannata ostaa noin kallista.
It's not worth buying something that expensive.
Key Takeaways
- kannattaa = "it's worth / you'd better." Impersonal: genitive subject + frozen 3sg kannattaa
- first infinitive. Never conjugate it for person.
- minä kannatan is a trap — it means "I support," a different verb.
- ei kannata ("no point / don't bother") is everywhere in speech; note the connegative kannata, not *kannattaa.
- kannattaisi softens the advice; on syytä (firmer, formal) and on hyvä (gentle) round out the range.
- Advice ≠ obligation: use täytyy/pitää only for real requirements.
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- Necessity: täytyy, pitää, on pakkoA2 — The necessive construction for 'must / have to': täytyy, pitää, on pakko — genitive subject, a frozen 3sg verb, a first infinitive, and a nominative object.
- The Genitive Subject: minun täytyyA2 — Why the necessive subject is genitive, not nominative — minun täytyy, opiskelijan täytyy — an impersonal verb frozen at 3sg with an oblique experiencer.
- The First Infinitive: the Dictionary FormA1 — The first infinitive is the form dictionaries list (puhua, syödä, tulla). It follows modal-like verbs and can be a subject — but it is not the verb's stem.
- Permission and Obligation: saada, joutuaB1 — saada 'be allowed to' (saan mennä), ei saa 'must not' (täällä ei saa polttaa), and joutua 'have to, unwillingly' (jouduin odottamaan) — the flavours of Finnish permission and obligation.