jabi-잖아(요)
-잖아요: When 'You Know' Starts to Accuse
Ending that presents content as something the listener already knows or should accept.
How to form it
| When | Form | Example |
|---|---|---|
| Polite | -잖아요 | 알잖아요 / 말했잖아요 |
| Intimate | -잖아 | 알잖아 / 어제 봤잖아 |
| After 이다 | -잖아요 | 학생이잖아요 |
-잖아요 is easy to misuse with the wrong person — high impact in spoken Korean, low margin for error upward.
The job
It presents the clause as already in the shared file.
English crutches:
- “as you know”
- “come on, you know”
- “that’s the thing”
None are exact. English “as you know” can stay gentle. Korean -잖아요 often does not — especially with falling intonation.
Forms
알다 → 알잖아요 / 알잖아
말하다 → 말했잖아요
이다 → 학생이잖아요Polite -잖아요 still carries the presumption. Soft address ≠ soft claim.
Soft vs sharp
| Shape | Feel |
|---|---|
| 내일 시험이잖아요 | peer reminder |
| 어제 말씀하셨잖아요 | can feel like 따짐 toward a senior |
| 어제 말씀하셨죠? | confirmation request |
| 어제 말씀하셨거든요 | reason / background |
When you need agreement without accusation, prefer -지요 or a plain 해요체 statement. When you need a reason without “you knew,” prefer -거든요 or -(으)니까. When you only need to set a soft refusal as background — 오늘은 좀 바쁜데요 — that is -는데요, not -잖아요.
Why dramas love it
A single ending marks epistemic pressure. The camera can stay on a face while the grammar does the confrontation.
너도 알잖아.
You know that too.
No swear word required.
Practice rule
Use it freely with peers about shared plans. With teachers, managers, and new acquaintances, default away from it until your ear for tone is reliable.
For the screen-side walkthrough, see -잖아요 in Drama Arguments.
Taught alongside this
In the Sejong course this appears in 어제 친구를 우연히 기차역에서 만났어요 — Sejong Korean 3A & 3B, Unit 2, on the theme of 만남과 추억. These come with it:
Words used above
Quick check
No sign-up, no score saved — just see if it stuck.
1. What does -잖아요 primarily assume?
2. Which is usually safer with a manager when you only need agreement?
3. Is -잖아요 only for angry speech?
Common questions
What is the difference between -잖아 and -잖아요?
-잖아 is intimate; -잖아요 is the polite ending. Politeness softens address, not the 'you already know' claim.
How is this different from -지요?
-지요 often checks or softens ('…right?'). -잖아요 pushes shared knowledge as already on the record.
Can I use it in TOPIK writing?
Avoid it in formal essays. Prefer plain statements or explicit reason endings.
Where do learners hear it most?
Drama arguments and everyday peer talk. See also the screen post on -잖아요 in arguments.
Seen in the wild
Lessons where this pattern showed up in real Korean — news, slang, drama lines.