Three subordinating conjunctions let you attach a clause of condition, concession, or purpose to a main clause: jos ("if"), vaikka ("although / even if"), and jotta ("so that, in order that"). Each opens a subordinate clause with normal (subject–verb) word order, and each is separated from the main clause by a comma. The trap for English speakers is that if in English does two jobs — real conditions ("if it rains") and reported yes/no questions ("I don't know if he's coming") — while Finnish jos does only the first. This page sorts out all three conjunctions and that split.
jos — real and hypothetical conditions
jos introduces a condition: the main clause happens provided the jos-clause is true. When the condition is realistic, both clauses stay in the present or past indicative.
Jos ehdit, tule käymään illalla.
If you have time, come over this evening.
Soita minulle, jos tarvitset apua.
Call me if you need help.
When the condition is hypothetical or unreal — something imagined rather than expected — Finnish puts both clauses in the conditional mood (the -isi- form). This is stricter than English, which only marks the "would" clause: English says "If I had time, I would come," using a plain past in the if-clause. Finnish marks the hypothetical everywhere.
Jos minulla olisi enemmän aikaa, opiskelisin japania.
If I had more time, I would study Japanese.
Jos sataisi, jäisimme kotiin.
If it were to rain, we'd stay home.
Two useful relatives of jos: jos vain softens a condition into a wish ("if only"), and ellei is the contracted negative, "if… not / unless." Ellei conjugates like the negative verb: ellen, ellet, ellei, ellemme, ellette, elleivät.
Jos vain tietäisin, missä hän on!
If only I knew where he is!
Ellet kiirehdi, myöhästymme junasta.
Unless you hurry, we'll miss the train.
The big trap: jos is NOT "whether"
This is the single most common jos error. English "if" doubles as "whether" in reported questions — I don't know *if he's coming. Finnish keeps these apart. A reported yes/no question is *not built with jos; it is built with the question clitic -ko / -kö attached to the verb, exactly as in a direct question.
En tiedä, tuleeko hän juhliin.
I don't know if (whether) he's coming to the party.
Kysyin, onko kauppa vielä auki.
I asked whether the shop is still open.
Using jos here — En tiedä, jos hän tulee — is a real mistake, not a stylistic slip: it forces the "condition" reading ("I don't know, if he comes"), which is nonsense. Whenever your English if can be swapped for whether, reach for the -ko/-kö indirect question, not jos.
vaikka — concession ("although / even if")
vaikka concedes: it grants that something is true or possible, yet the main clause holds anyway. It covers both English "although" (a real fact) and "even if" (a hypothetical), and the mood tells you which.
Menen töihin, vaikka olen kipeä.
I'm going to work even though I'm sick.
Vaikka en ymmärrä kaikkea, pidän suomen kielestä.
Even though I don't understand everything, I like the Finnish language.
With the conditional, vaikka becomes "even if," pushing the concession into the imagined:
Vaikka sataisi kaatamalla, lähtisin lenkille.
Even if it were pouring, I'd go for a run.
One point of interference: languages like English don't pair "although" with a following "but," and neither does Finnish. A vaikka-clause already carries the whole concessive force, so a second "but" (mutta) in the main clause is wrong. (For the fuller concessive toolkit — vaikka, siitä huolimatta, joskin — see concessive clauses.)
jotta — purpose ("so that, in order to")
jotta states the goal of the main action: you do X in order that Y. Modern standard Finnish normally follows jotta with the present indicative; the older norm preferred the conditional (jotta pääsisin), which you still meet in careful or literary writing.
Säästän rahaa, jotta voin matkustaa ensi kesänä.
I'm saving money so that I can travel next summer.
Puhun hitaasti, jotta kaikki ymmärtävät.
I speak slowly so that everyone understands.
Do not confuse purpose jotta with the plain complementiser että ("that"), which reports facts, thoughts, and wishes rather than goals. Toivon, että voitat ("I hope that you win") reports a wish; Harjoittelen, jotta voitan ("I train so that I win") states a purpose. The two are sorted out in detail on että vs jotta.
Toivon, että kaikki menee hyvin.
I hope (that) everything goes well.
Common Mistakes
❌ En tiedä, jos hän tulee.
Incorrect — jos is only conditional; a reported yes/no question uses -ko.
✅ En tiedä, tuleeko hän.
I don't know if (whether) he's coming.
❌ Jos minulla olisi aikaa, tulen.
Incorrect — a hypothetical needs the conditional in BOTH clauses, not just one.
✅ Jos minulla olisi aikaa, tulisin.
If I had time, I would come.
❌ Vaikka satoi, mutta menin ulos.
Incorrect — vaikka already concedes; don't add a second 'but' (mutta).
✅ Vaikka satoi, menin ulos.
Even though it was raining, I went out.
❌ Opiskelen, että pääsen yliopistoon.
Incorrect — this states a purpose, so it needs jotta, not the plain että.
✅ Opiskelen, jotta pääsen yliopistoon.
I study so that I get into university.
Key Takeaways
- jos = condition. Real → indicative both clauses; hypothetical → conditional -isi- in both.
- jos never means "whether." Reported yes/no questions take the -ko/-kö clitic (En tiedä, tuleeko hän).
- vaikka = concession ("although / even if"); it needs no following mutta.
- jotta = purpose ("so that"); keep it distinct from the fact-reporting että.
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Start learning Finnish→Related Topics
- Conditional in 'if' SentencesB1 — Choosing the mood after jos ('if'): present for real conditions, conditional in both clauses for hypotheticals, perfect conditional for past counterfactuals.
- että vs jottaB1 — How to choose että ('that', introducing a reported statement or complement) over jotta ('so that / in order to', introducing purpose) — two subordinators one letter apart.
- Concessive Clauses: vaikka, siitä huolimattaC1 — Express 'although / even though / even if' with vaikka, where mood decides factual vs hypothetical concession, plus siitä huolimatta and vaikka kuinka.
- Indirect Questions: en tiedä tuleeko hänB2 — To embed a question, keep -ko/-kö for yes/no (En tiedä, tuleeko hän) and the wh-word for open ones — never 'if', and no tense backshift.