If you learn only one way to say "it seems / I think" in Korean, learn this one. 것 같다 is the everyday workhorse of conjecture and opinion — Koreans reach for it constantly, far more often than English speakers say "seems." The structure is [clause + modifier ending + 것 같다], and the single most important thing to grasp before anything else is where the tense goes: on the modifier ending, not on 같다.
Where the meaning comes from
것 같다 is built from two pieces you already know: 것, the bound noun "thing / fact / case" (see 것 as a nominalizer), and 같다, "to be like / the same as." Put together they say, almost literally, "it is like the case that [clause]." That is why "seems" is only a rough translation — the Korean is really comparing a whole situation to reality and finding a resemblance.
지금 밖에 비가 오는 것 같아요.
jigeum bakke biga oneun geot gatayo
It seems to be raining outside right now.
Because 것 nominalizes the entire clause and 같다 merely predicates the resemblance, the clause's tense has to be marked inside, on the modifier ending that links it to 것. This is the hinge the whole structure turns on.
The three modifier endings = three tenses
Take one verb — 오다 ("to come / [rain] to fall") — and watch the tense shift entirely by swapping the modifier ending, while 같다 stays put:
| Modifier | Time of the guessed event | Example |
|---|---|---|
| -는 (present) | happening now | 비가 오는 것 같다 — "seems it's raining" |
| -(으)ㄴ (past) | already happened | 비가 온 것 같다 — "seems it rained" |
| -(으)ㄹ (prospective) | about to / will happen | 비가 올 것 같다 — "looks like it'll rain" |
어젯밤에 비가 온 것 같아요.
eojetbame biga on geot gatayo
It seems it rained last night.
하늘을 보니 곧 비가 올 것 같아요.
haneureul boni got biga ol geot gatayo
Looking at the sky, it looks like it'll rain soon.
English keeps "seems" fixed and changes the embedded verb ("seems to rain / seems to have rained / seems about to rain"). Korean does the mirror image: it keeps 같다 fixed and changes the modifier ending in front of 것. Get comfortable with that swap and you can express any tense of a guess.
Verbs vs. adjectives: the split you must respect
Korean sorts predicates into action verbs and descriptive verbs (adjectives), and they select different present-tense modifiers before 것 같다:
- Verbs take -는 for the present: 가는 것 같다, 먹는 것 같다, 오는 것 같다.
- Adjectives take -(으)ㄴ for the present state: 좋은 것 같다, 예쁜 것 같다, 비싼 것 같다 — never -는.
이 식당 음식이 좀 매운 것 같아요.
i sikdang eumsigi jom maeun geot gatayo
The food at this place seems a little spicy.
요즘 이 드라마가 제일 재미있는 것 같아요.
yojeum i deuramaga jeil jaemiinneun geot gatayo
These days this drama seems to be the most fun.
Watch the second one: 재미있다 ("to be fun/interesting") is built on 있다, and the 있다-family behaves like a verb here, taking -는 (재미있는), not adjective -(으)ㄴ. This descriptive-vs-action split is the source of nearly every 것 같다 error, so the full paradigm gets its own drill page — study it there until it is automatic.
Nouns: 인 것 같다
With a noun, insert the copula 이다 in its modifier form 인:
저 사람 새로 온 직원인 것 같아요.
jeo saram saero on jigwonin geot gatayo
That person seems to be the new staff member.
Present is 인 것 같다 (학생인 것 같아요, "seems to be a student"); the past and future noun forms are covered on the tense page.
Register: one structure, three speech levels
것 같다 wears the ending appropriate to your speech level, and nothing else changes:
| Speech level | Form | Example |
|---|---|---|
| informal polite (해요체) | 것 같아요 | 비가 오는 것 같아요 |
| formal polite (합니다체) | 것 같습니다 | 비가 오는 것 같습니다 |
| intimate (반말) | 것 같아 | 비가 오는 것 같아 |
이번 분기 실적은 작년보다 나아진 것 같습니다.
ibeon bungi siljeogeun jangnyeonboda naajin geot gatseumnida
This quarter's results appear to have improved over last year. (formal)
것 같다 vs. -나 보다: your impression vs. the evidence
Korean has a second conjecture device, -나 보다 / -(으)ㄴ가 보다, and English speakers blur the two. The difference is the source of the guess. 것 같다 reports your own impression — it can rest on direct perception, reasoning, or just a feeling, and it can even be about yourself. -나 보다 reports an inference from external evidence about someone or something else, keeping the speaker at arm's length.
동생이 배고픈 것 같아요.
dongsaeng-i baegopeun geot gatayo
My little brother seems hungry. (my read of him)
동생이 배고픈가 봐요.
dongsaeng-i baegopeun-ga bwayo
My little brother must be hungry. (judging by the evidence — he's raiding the fridge)
Both are valid; they differ in stance. The full contrast lives on 것 같다 vs. -나 보다, and where each sits on the confidence scale is mapped on the certainty spectrum.
Common Mistakes
Mistake 1 — Verb -는 forced onto an adjective. Adjectives take -(으)ㄴ in the present.
❌ 이 꽃 진짜 예쁘는 것 같아요.
Wrong — 예쁘다 is an adjective; it takes -(으)ㄴ.
✅ 이 꽃 진짜 예쁜 것 같아요.
i kkot jinjja yeppeun geot gatayo
This flower seems really pretty.
Mistake 2 — Present modifier where you mean the past. To guess that something has happened, put the past -(으)ㄴ on the inner verb.
❌ 누가 벌써 다 먹는 것 같아요.
Says 'someone seems to be eating it all up' — not 'someone seems to have eaten it.'
✅ 누가 벌써 다 먹은 것 같아요.
nuga beolsseo da meogeun geot gatayo
Someone seems to have already eaten it all.
Mistake 3 — Stranding the tense on 같다. Conjugating 같았어요 shifts when you judged, not when the event was. Past events go on the modifier.
❌ 어제 비가 오는 것 같았어요.
Means 'yesterday it seemed to be raining,' not 'it seems it rained.'
✅ 비가 온 것 같아요.
biga on geot gatayo
It seems it rained.
Mistake 4 — Dropping 것. The bound noun 것 is obligatory; the clause has nothing to attach to without it.
❌ 비가 오는 같아요.
Wrong — 것 is missing.
✅ 비가 오는 것 같아요.
biga oneun geot gatayo
It seems to be raining.
Mistake 5 — Forgetting 인 with a noun. A noun needs the copula modifier 인 before 것 같다.
❌ 저 사람 학생 것 같아요.
Wrong — a noun needs 인: 학생인 것 같아요.
✅ 저 사람 학생인 것 같아요.
jeo saram haksaeng-in geot gatayo
That person seems to be a student.
Key Takeaways
- 것 같다 = 것 (nominalizer "the case that…") + 같다 ("be like") → "it seems / I think."
- The tense lives on the modifier ending: -는 (present), -(으)ㄴ (past), -(으)ㄹ (future) — 같다 itself stays put.
- Verbs take -는 for the present; adjectives take -(으)ㄴ; nouns take 인. Mixing these up is the top error.
- Register just swaps the ending: 것 같아요 · 것 같습니다 · 것 같아.
- 것 같다 = your impression (flexible, even about yourself); -나 보다 = inference from external evidence about someone else.
Now practice Korean
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Start learning Korean→Related Topics
- The Modifier-Tense Rule Before 것 같다: -(으)ㄴ vs -는 vs -(으)ㄹTOPIK 3 — The one paradigm that dissolves most 것 같다 errors — which modifier ending marks past, present, and future for verbs, adjectives, and nouns, and why the descriptive-vs-action split flips the rules.
- 것 같다 as an Opinion Softener (Not Real Doubt)TOPIK 3 — Koreans use 것 같다 to downgrade a firm opinion into a polite personal impression — even about food they're tasting right now — where English would never say 'seems.'
- -나 보다 / -(으)ㄴ가 보다: I Guess, Judging From…TOPIK 4 — The 보다 conjecture family — an evidential 'I gather / it seems, judging from what I observe' — with -나 보다 for verbs and -(으)ㄴ가 보다 for adjectives, and the crucial rule that you can't use it about your own feelings.
- Degrees of Certainty: A Map of Korean ConjectureTOPIK 4 — A hub page ranking Korean's guessing endings from tentative to near-certain — and, more importantly, sorting them by evidential source, because Korean grammaticalises both how sure you are and where the guess came from.