면: How If and When Work in Korean
면 is Korean's all-purpose conditional: attach it to any verb or adjective stem and you've said both "if" and "when" at once, no separate word required. Use 으면 after a consonant, 면 after a vowel — 비가 오면 집에 있어요, "if/when it rains, I stay home." From there it builds into 면 돼요 (just do X), 면 안 돼요 (must not), 면 좋겠어요 (I wish), and 다면 for pure hypotheticals.
English makes you pick a lane. "If it rains, I'll stay home" and "When it rains, I stay home" are two different sentences with two different words, and picking the wrong one changes what you're saying. Korean looked at that problem and shrugged: 면 covers both, and the sentence's own logic tells you whether it's a hypothetical or a routine. This is the single most efficient grammar point in the language, and most textbooks bury it three chapters after 거든 and 다가, which is backwards — you'll use 면 fifty times more often than either.
The mechanical part: (으)면 attaches to everything
| Stem ends in | Attach | Example |
|---|---|---|
| Vowel (가다, 오다) | 면 | 가다 → 가면 |
| Consonant (먹다, 있다) | 으면 | 먹다 → 먹으면 |
| ㄹ-ending stems (살다) | 면 (drop nothing extra) | 살다 → 살면 |
That's the whole rule, and it works identically on adjectives — Korean doesn't grammatically separate "if it's raining" (verb) from "if it's cold" (adjective) the way some languages do. Same particle, same attachment logic:
비가 오면 집에 있어요.
bi-ga o-myeon ji-be i-sseo-yo.
If/when it rains, I stay home.
오다 stem ends in a vowel (ㅗ) → just add 면.
시간이 있으면 전화해요.
si-ga-ni i-sseu-myeon jeon-hwa-hae-yo.
If you have time, call me.
있다 stem ends in a consonant → add 으면.
날씨가 좋으면 산책해요.
nal-ssi-ga jo-eu-myeon san-chaek-hae-yo.
If the weather's nice, I go for a walk.
좋다 is an adjective — identical rule applies.
The everyday power trio (plus one pivot word)
Once you have 면, three combinations do most of the real conversational work, and a fourth word is really just 면 wearing a disguise:
| Pattern | Literally | Actually means |
|---|---|---|
| ~면 돼요 | if X, it's fine | That's all you need to do — just X |
| ~면 안 돼요 | if X, it's not fine | You must not X / that's not allowed |
| ~면 좋겠어요 | if X, it'd be nice | I wish X / I hope X (softer than asking directly) |
| 그러면 → 그럼 | if it's so | "Then" / "in that case" — the conversation pivot |
그러면 is technically "그렇다 (to be so) + 면" — literally "if that's the case." Koreans contract it to 그럼 so often in speech that the full form can sound like you're reading off a script. Notice also that 면 돼요 is doing something clever: it's not describing a condition at all, it's using the conditional shape to mean "the minimum requirement is met" — the same trick Korean pulls with 아/어도 돼요 for permission, just one particle over.
다면: the daydream version of 면
Swap in 다면 and the sentence stops being a plan and starts being a fantasy. 다면 is built from the plain declarative ending (-ㄴ다/는다 for verbs) plus 면, and that extra layer of "stating it as fact, hypothetically" is exactly what marks the sentence as counterfactual or unlikely — the grammar equivalent of prefacing something with "imagine if."
시험에 합격하면 유학 갈 거예요.
si-heo-me hap-gyeo-ka-myeon yu-hak gal geo-ye-yo.
If I pass the exam, I'm going to study abroad.
Plain 면 — a real plan the speaker is working toward.
복권에 당첨된다면 뭐 하고 싶어요?
bok-gwo-ne dang-cheom-doen-da-myeon mwo ha-go si-peo-yo?
If you ever won the lottery, what would you want to do?
다면 — nobody expects this to happen. Pure daydream.
면 in the wild: a text that runs on it
오늘 스케줄 취소됐어. 시간 되면 커피 마시러 갈래?
o-neul seu-ke-jul chwi-so-dwae-sseo. si-gan doe-myeon keo-pi ma-si-reo gal-lae?
Today's schedule got canceled. If you're free, want to grab coffee?
좋아! 몇 시에 가면 돼?
jo-a! myeot si-e ga-myeon dwae?
Sounds good! What time should I come?
여섯 시면 좋겠어. 늦으면 안 돼, 사람들이 알아볼 수도 있으니까.
yeo-seot si-myeon jo-ke-sseo. neu-jeu-myeon an dwae, sa-ram-deu-ri a-ra-bol su-do i-sseu-ni-kka.
6 would be great. Don't be late — people might recognize us.
알겠어, 그럼 이따 봐!
al-ge-sseo, geu-reom i-tta bwa!
Got it, see you later then!
Frequently asked questions
What's the difference between 면 and 다면 in Korean?
면 attaches directly to a stem and works for both realistic conditions and general "whenevers." 다면 adds the plain declarative ending first, which frames the condition as hypothetical or unlikely — save it for daydreams, lottery scenarios, and "imagine if" statements rather than actual plans.
Is 으면 or 면 correct after 있다?
으면 — 있다's stem 있 ends in the consonant ㅆ, so it needs the connecting 으 before 면: 있으면. The rule is purely about the last sound of the stem, not the meaning of the verb, so it applies the same way to 없으면, 먹으면, and 좋으면.
Does 면 돼요 always mean permission?
No — it means "that's sufficient," which often reads as instruction rather than permission. 여기 서명하면 돼요 means "just sign here" (the minimum required action), not "you're allowed to sign here." For actual permission, Korean uses 아/어도 돼요 instead.
Why do Koreans say 그럼 instead of 그러면?
그럼 is the spoken contraction of 그러면 ("if that's so"), and in casual conversation the full form can sound stiff or written. Use 그럼 in speech and texting; 그러면 shows up more in formal writing or when someone's being deliberately precise.
Can I use 면 to make a polite request?
Yes — pairing it with 좋겠어요 is one of the softest ways to ask for something in Korean. 창문 좀 닫아 주면 좋겠어요 ("I'd appreciate it if you closed the window") lands far gentler than a direct command, which is exactly why 면 좋겠어요 shows up constantly in workplace and service Korean.