활발하다 Korean adjective conjugation
to be lively
Every form of 활발하다 across the four speech levels. It is 여 irregular — 하다 and every verb built on it: 하다 → 하여 → 해요.
기본형Principal parts
The four forms the dictionary prints. Every other form on this page is derived from them.
- 관형사형Modifier
- 활발한
- 아/어Infinitive
- 활발해
- -으니Since
- 활발하니
- 합니다Formal
- 활발합니다
현재Present
The tense that does the most work. 해요체 is the one to learn first — it is polite without being formal, and it is what most conversation is in.
| 해요체Polite | 합니다체Formal | 해체Casual | 한다체Plain | |
|---|---|---|---|---|
| 서술Statement | 활발해요 | 활발합니다 | 활발해 | 활발하다 |
과거Past
| 해요체Polite | 합니다체Formal | 해체Casual | 한다체Plain | |
|---|---|---|---|---|
| 서술Statement | 활발했어요 | 활발했습니다 | 활발했어 | 활발했다 |
미래·추측Future & presumptive
| 해요체Polite | 합니다체Formal | 해체Casual | 한다체Plain | |
|---|---|---|---|---|
| -겠-Will / must be | 활발하겠어요 | 활발하겠습니다 | 활발하겠어 | 활발하겠다 |
| -을 것이다Going to | 활발할 거예요 | 활발할 것입니다 | 활발할 거야 | 활발할 것이다 |
의문Questions
| 해요체Polite | 합니다체Formal | 해체Casual | 한다체Plain | |
|---|---|---|---|---|
| 현재Present | 활발해요? | 활발합니까? | 활발해? | 활발하니? |
| 과거Past | 활발했어요? | 활발했습니까? | 활발했어? | 활발했니? |
부정Negation
| 해요체Polite | 합니다체Formal | 해체Casual | 한다체Plain | |
|---|---|---|---|---|
| 안Not (short) | 안 활발해요 | 안 활발합니다 | 안 활발해 | 안 활발하다 |
| -지 않다Not (long) | 활발하지 않아요 | 활발하지 않습니다 | 활발하지 않아 | 활발하지 않다 |
높임Honorific
| 해요체Polite | 합니다체Formal | 해체Casual | 한다체Plain | |
|---|---|---|---|---|
| 현재Present | 활발하세요 | 활발하십니다 | 활발하셔 | 활발하시다 |
| 과거Past | 활발하셨어요 | 활발하셨습니다 | 활발하셨어 | 활발하셨다 |
관형사형Modifying a noun
- 현재Present
- 활발한
- 과거Past
- 활발한
- 미래Future
- 활발할
- 회상Used to
- 활발하던
연결Joining clauses
- -고and
- 활발하고
- -게-ly / so that
- 활발하게
- -어서so / and then
- 활발해서
- -으니까since
- 활발하니까
- -으면if / when
- 활발하면
- -지만but
- 활발하지만
- -는데and / but (setting up)
- 활발한데
- -어도even if
- 활발해도
문형Sentence patterns
How the dictionary says this verb is used. The numbers are slots: 1 is the subject, 2 the object.
- 1이 활발하다
예문In real sentences
From the dictionary, each with its translation.
공기가 충분하면 더 활발하더라고요.
It seems that if the water is well-aerated, they're a lot more active.
숫자는 자연속에서 활발한 활동을 합니다.
Numbers were active agents in nature.
고통은 매우 연구가 활발하게 진행되는 분야입니다.
Pain is an area of active research.
범죄율이 떨어졌습니다. 거리들마다 사람들로 활발하게 북적대기 때문입니다.
Crime rates dropped, because the streets were alive with people.
자주 묻는 질문Common questions
How do you conjugate 활발하다 in Korean?
활발하다 (to be lively) is 활발해요 in the polite 해요체, 활발합니다 in formal 합니다체, 활발해 in casual 반말 and 활발하다 in the plain written style. The past is 활발했어요.
What is the past tense of 활발하다?
활발했어요 in everyday polite speech, 활발했습니다 formally. It is built from the 아/어 form 활발하여 plus ㅆ, which is why an irregular stem shows its irregularity here.
Is 활발하다 irregular?
Yes — it is 여 irregular (여 불규칙). 하다 and every verb built on it: 하다 → 하여 → 해요. That is why the stem looks different in 활발하여 and 활발하니 but unchanged in 활발합니다.
What TOPIK level is 활발하다?
3급 — TOPIK 3, lower intermediate.
Dictionary form, meaning, sentence patterns, examples and audio from the 국립국어원 한국어기초사전, used under CC BY-SA 2.0 KR.
Conjugations are generated by this site's own engine and checked against the 9,380 forms the dictionary publishes on every build.