Comparative Clauses: kuin, sitä … mitä | Finnish Grammar

Comparison is where two clauses get stitched together: you are taller than I thought, the more I read, the less I understand. Finnish builds these with one central word — kuin ("than / as") — plus a small set of correlative frames. This page treats comparison as a clause-level operation: what case the compared term takes, how kuin can shrink a whole clause down to a single word, and how the mitä … sitä correlative expresses "the more … the more." The word-level basics of the comparative degree live on the comparative and "than" pages; here we look at what happens across the join.

kuin joins the two halves of a comparison

Kuin is the conjunction of comparison. It follows a comparative adjective or adverb and introduces the standard — the thing you measure against. The standard can be a single word or a full clause, and this flexibility is the key insight: kuin introduces a reduced clause, so the word after it keeps whatever case it would carry if the clause were spelled out.

For a plain subject comparison, that case is the nominative:

Olet paljon pitempi kuin minä.

You're a lot taller than I am.

Tämä tehtävä oli helpompi kuin luulin.

This task was easier than I thought.

The second sentence shows the full-clause option: kuin luulin ("than I thought") is an entire finite clause, not just a word. English does exactly the same thing — "than I thought," "than she expected" — so this half comes naturally. The trap is elsewhere.

The compared terms mirror each other's case

Here is the rule English speakers break: the standard after kuin takes the same case as the term it is compared with. If the first term is an elative, so is the second; if it is an illative, so is the second. This falls straight out of the "reduced clause" idea — both terms play the same grammatical role, so both wear the same case.

Pidän sinusta enemmän kuin hänestä.

I like you more than (I like) him.

Pitää governs the elative (sinusta), so the compared term is also elative (hänestä) — not nominative hän. Compare a verb that governs the illative:

Luotan sinuun enemmän kuin häneen.

I trust you more than (I trust) him.

Puhun ruotsia paremmin kuin saksaa.

I speak Swedish better than German.

In that last one, ruotsia and saksaa are both partitive objects of puhua. Getting this wrong — saying kuin saksa — is the single commonest advanced error, because English "than German" gives no case cue at all.

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Think of kuin as a mirror. Whatever case the first compared thing wears, the second wears the same one. Pidän kahvista enemmän kuin teestä (both elative), annoin sen sinulle mieluummin kuin hänelle (both allative). The mirror only breaks when the two terms genuinely play different roles.

Equatives: yhtä … kuin

For "as … as" — equal degree rather than greater — Finnish uses yhtä (an invariable "equally") before the adjective, and again kuin for the standard:

Hän on melkein yhtä pitkä kuin isänsä.

He's almost as tall as his father.

Tämä kahvila ei ole yhtä hyvä kuin ennen.

This café isn't as good as it used to be.

Suomen talvi on yhtä pimeä kuin pitkä.

The Finnish winter is as dark as it is long.

The frame is fixed: yhtä + [adjective] + kuin + [standard]. More equative patterns — samanlainen kuin "the same kind as", saman verran kuin "the same amount as" — are on the equality page.

Comparing whole actions: kuin että

When the second half of the comparison is itself a full clause with its own subject and finite verb, and you want to keep it fully spelled out, Finnish links it with kuin että ("than that / than to"). This is the pattern for weighing one course of action against another, typically after mieluummin ("rather") or parempi ("better"):

Kävelen mieluummin kotiin kuin että odotan tunnin bussia.

I'd rather walk home than wait an hour for the bus.

On parempi kysyä kahdesti kuin että tekee virheen.

It's better to ask twice than to make a mistake.

Teen sen mieluummin itse kuin että joku muu pilaa sen.

I'd rather do it myself than have someone else ruin it.

You can often drop että when the second clause has no explicit subject (mieluummin kävelen kuin odotan), but kuin että is the safe, fully explicit form and is required once the second clause carries its own subject.

The correlative: mitä … sitä ("the more … the more")

Finnish expresses the English "the more X, the more Y" with a matched pair: mitä + comparative in the first clause, sitä + comparative in the second. Both mitä and sitä are frozen here — they do not decline for the noun — and the comparative words carry the meaning.

Mitä enemmän luen, sitä vähemmän ymmärrän.

The more I read, the less I understand.

Mitä vanhemmaksi tulen, sitä nopeammin aika kuluu.

The older I get, the faster time passes.

Mitä pikemmin lähdemme, sitä paremmin ehdimme perille.

The sooner we leave, the better we'll make it there in time.

The clipped version — with no verbs at all — is a fixed idiom worth memorising whole:

Mitä enemmän, sitä parempi.

The more, the better.

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Notice the case can travel onto the comparative in the mitä-clause: mitä vanhemmaksi tulen uses the translative -ksi because tulla ("become") governs it. The frame is fixed, but the comparative words inside it still obey the verb's rection — just like anywhere else.

samoin kuin: "just as, likewise"

Samoin kuin ("in the same way as / just as") draws a parallel rather than a ranking. It sets two situations side by side as alike:

Suomessa, samoin kuin Ruotsissa, koulutus on maksutonta.

In Finland, just as in Sweden, education is free of charge.

Hän pärjäsi kokeessa hyvin, samoin kuin viime vuonna.

She did well on the exam, just as last year.

This samoin kuin is a fixed adverbial — (formal / neutral) — and is common in essays and reports where you want to note that one case behaves like another.

kuin vs kun: the one-vowel trap

Kuin ("than / as", comparison) and kun ("when / as / since", time and cause) differ by a single vowel and never overlap in meaning. Because English "as" covers both jobs — "as tall as you" (comparison) and "as I arrived" (time) — English speakers constantly swap them. Comparison is always kuin; a time or reason clause is always kun — and for the temporal and causal senses of kun, see koska vs kun.

Olit nopeampi kuin minä, kun juoksimme eilen.

You were faster than me when we ran yesterday.

That one sentence carries both: kuin for the comparison, kun for the time clause.

Common Mistakes

❌ Pidän sinusta enemmän kuin hän.

Incorrect — the standard must mirror the first term's case (elative): hänestä, not nominative hän.

✅ Pidän sinusta enemmän kuin hänestä.

I like you more than him.

❌ Olet pitempi kun minä.

Incorrect — comparison takes kuin, not the temporal kun.

✅ Olet pitempi kuin minä.

You're taller than me.

❌ Hän on yhtä pitkä kun sinä.

Incorrect — again kuin, and the equative frame is yhtä … kuin.

✅ Hän on yhtä pitkä kuin sinä.

He's as tall as you.

❌ Sitä enemmän luen, mitä vähemmän ymmärrän.

Incorrect — the mitä-clause comes first, the sitä-clause second.

✅ Mitä enemmän luen, sitä vähemmän ymmärrän.

The more I read, the less I understand.

❌ Kävelen mieluummin kuin odotan tunnin bussia.

Awkward — with a full second clause carrying its own material, use kuin että.

✅ Kävelen mieluummin kuin että odotan tunnin bussia.

I'd rather walk than wait an hour for the bus.

Key Takeaways

kuin ("than / as") introduces a reduced clause; the standard after it mirrors the case of the term it is compared with (enemmän sinusta kuin hänestä).
Equal degree uses the frame yhtä … kuin (yhtä pitkä kuin sinä).
kuin että links a fully spelled-out second clause, especially after mieluummin and parempi.
The correlative mitä [comparative] … sitä [comparative] means "the more … the more"; both function words are frozen, and the mitä-clause comes first.
samoin kuin ("just as") draws a parallel; and never confuse comparison kuin with temporal kun.

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