目錄
「잖아요」 and 「거든요」 are often simplified into Chinese equivalents like “啊” or “因為,” but when Koreans hear these two endings, they picture completely different situations. One reminds the listener, “You already knew this, right?” while the other tells them, “This is new information you didn’t know yet.” This difference in the speaker’s stance is what really determines which one should be used.
Why Is It Important to Understand the Nuance of 「잖아요」 and 「거든요」?
When watching Korean dramas, you will often hear characters say 「-잖아요」 or 「-거든요」 while raising their voice or stretching out the final syllables. In these situations, the emotion is often especially noticeable. These two endings also appear almost every day in situations such as a restaurant employee explaining a regular closing day to a traveler, or friends confirming plans with each other. If you cannot distinguish between them, your sentences can sound very strange. You may simply want to explain a new reason, but end up sounding as if the other person should have known it already, which can make the conversation awkward or even make you sound impatient.
Basic Usage and Conjugation Rules for 「잖아요」
「잖아요」 is a conversational contraction of 「-지 않아요」. It originally had the rhetorical structure of “isn’t it…?” Over time, it gradually became established as an independent sentence ending used to confirm or remind the listener of something both sides are expected to know.
| What It Attaches To | Pattern | Example |
| Verb / adjective stem | stem＋잖아요 | 춥잖아요 |
| Past tense | stem＋았/었잖아요 | 말했잖아요 |
| Noun with batchim | noun＋이잖아요 | 가수잖아요 |
| Noun without batchim | noun＋잖아요 | 친구잖아요 |
「잖아요」 Usage ①｜Reminding the Listener of Something They Already Know
- Example: 오늘 날씨 엄청 춥잖아요
Romanization: o-neul nal-ssi eom-cheong chup-jan-a-yo
Translation: It’s really cold today, you know.
(You know that too, right?)
This is often used when reminding someone to dress warmly. The nuance is, “This is a fact, and you can feel it too.” It is not presenting new information. - Example: 우리 어제 약속했잖아요
Romanization: u-ri eo-je yak-sok-haet-jan-a-yo
Translation: We made plans yesterday, remember?
This is used when the other person seems to have forgotten the arrangement. The tone combines “reminding” with “slight confirmation.” It is softer than directly saying “Did you forget?”, but it can still carry a small amount of dissatisfaction. - Example: 여기 마카롱 맛집이잖아요
Romanization: yeo-gi ma-ka-rong mat-jib-i-jan-a-yo
Translation: This place is famous for macarons, you know.
This is often used when suggesting a particular shop to a friend. It carries the nuance of “Everyone knows this place is good, which is why I’m recommending it.” Compared with simply introducing the shop, it adds a sense of familiarity.
「잖아요」 Usage ②｜Correcting or Revising the Listener’s Understanding
- Example: 제 말은 그런 뜻이 아니잖아요
Romanization: je mal-eun geu-reon tteus-i a-ni-jan-a-yo
Translation: That’s not what I meant.
This is used when the other person has misunderstood what you meant. The speaker is correcting the listener’s interpretation rather than providing new information, and the sentence can carry a slight sense of urgency or frustration. - Example: 지금 그 얘기를 하는 게 아니잖아
Romanization: ji-geum geu yae-gi-reul ha-neun ge a-ni-jan-a
Translation: That’s not what we’re talking about right now.
This is the informal form and often appears in arguments between friends. It sounds more direct and can carry the impatient nuance of “How are you missing the point?” - Example: 할머니 주무시잖아
Romanization: hal-meo-ni ju-mu-si-jan-a
Translation: Grandma is sleeping.
This can be used to remind someone to lower their voice. The speaker is pointing out a fact that both people should already know, but that the other person is currently overlooking.
Basic Usage and Conjugation Rules for 「거든요」
The core function of 「거든요」 is to provide a reason or piece of information that the listener did not already know. It commonly appears when answering “why?” or when the speaker voluntarily adds an explanation. Compared with 「-아서/어서」, it is more conversational and sounds more like casually adding an explanation during a conversation.
| What It Attaches To | Pattern | Example |
| Verb / adjective stem | stem＋거든요 | 바쁘거든요 |
| Past tense | stem＋았/었거든요 | 막혔거든요 |
| Noun with batchim | noun＋이거든요 | 학생이거든요 |
| Noun without batchim | noun＋거든요 | 발표거든요 |
「거든요」 Usage ①｜Explaining a Reason the Listener Does Not Know
- Example: 길이 막혔거든요
Romanization: gil-i mak-hyeot-geo-deun-yo
Translation: The traffic was bad, you see.
This is often used to explain why you were late. The other person did not know that there had been traffic, so the sentence supplies new information. The tone feels more like casually explaining the situation than making a formal report. - Example: 오늘은 지각하면 안 돼요. 제가 발표거든요
Romanization: o-neul-eun ji-gak-ha-myeon an dwae-yo. je-ga bal-pyo-geo-deun-yo
Translation: I can’t be late today.
I’m giving a presentation.
Giving the conclusion first and then adding the reason is a very typical pattern with 「거든요」. It sounds natural and not overly stiff. - Example: 제가 지금 돈이 별로 없거든요
Romanization: je-ga ji-geum don-i byeol-lo eop-geo-deun-yo
Translation: I don’t really have much money right now.
This is often used when politely declining an invitation or asking the other person to understand your situation. It sounds softer than rejecting something directly and can also carry a slightly apologetic feeling.
「거든요」 Usage ②｜Leading Into Another Topic or Adding a Boastful Tone
- Example: 난 그 여자 또 만나고 싶어요. 진짜 예쁘거든요
Romanization: nan geu yeo-ja tto man-na-go sip-eo-yo. jin-jja ye-bbeu-geo-deun-yo
Translation: I want to see that woman again.
She’s really pretty, you know.
When the intonation rises, it can sound boastful or emphatic. Instead of simply explaining a reason, it sounds like the speaker is sharing something worth mentioning. - Example: 나는 숙제 벌써 다 했거든
Romanization: na-neun suk-je beol-sseo da haet-geo-deun
Translation: I already finished all my homework, you know.
This is the informal form and often appears when friends are teasing or competing with each other. It can sound a little smug and may imply a contrast like “You haven’t finished yours yet, have you?” - Example: 못생겼다고 초대를 못 받았거든요
Romanization: mot-saeng-gyeot-da-go cho-dae-reul mot bad-at-geo-deun-yo
Translation: I wasn’t invited because they said I was ugly.
This is used when describing a surprising or emotionally charged reason. Compared with the more straightforward 「-아서」, it sounds more conversational and has more of a storytelling quality.
「잖아요」 vs 「거든요」: See the Nuance Difference at a Glance
| Comparison | 잖아요 | 거든요 |
| Style | Reminder, confirmation, correction | Explanation, reason, additional information |
| Core nuance | Information the listener already knows, with a reminding tone | Information the listener does not know, with an explanatory tone |
| Main function | Confirm shared knowledge, correct misunderstandings | Give reasons, lead into additional information |
| Use in formal writing | Less common in formal writing | Less common in formal writing |
| Common mistake | ❌ Using it to explain a new reason the listener does not know | ❌ Using it to remind someone of something they already know |
| Correct use | ✅ Reminding someone of a shared memory or fact | ✅ Adding a reason the listener does not know |
▌Known Information vs Unknown Information
❌ Unnatural: 길이 막혔잖아요 (using “The traffic was bad, you know” as a reminder)
(The listener had no idea that the road was congested, so using 「잖아요」 can feel confusing, almost as if you are blaming them for not already knowing.)
✅ Correct: 길이 막혔거든요
This sentence adds the reason—traffic congestion—that the listener did not originally know, so 「거든요」 should be used instead of 「잖아요」.
▌Different Emotions Created by Rising Intonation
❌ Careless mixing: Treating 「거든요」 as nothing more than “because” and ignoring the boastful nuance that can appear when the intonation rises
✅ Correct: Judge by context. Use falling intonation when calmly explaining a reason; if you want to sound proud or emphasize the point, you can slightly lengthen the ending
This distinction is especially noticeable in spoken conversation. Even with the same ending, a change in intonation can completely change the emotion being conveyed.
How to Use 「잖아요」 and 「거든요」 Naturally in Everyday Korean
In everyday conversation, Koreans do not consciously think through grammar rules before switching between these two endings. They use them instinctively based on nuance. When traveling, the situations where you are most likely to hear them include employees explaining regular closing days, friends confirming plans, or someone casually giving a reason after being asked “why?” Mastering these two endings essentially means mastering the basic logic of “reminding” and “explaining” in everyday Korean conversation.
▌Situation ①｜Asking About a Closing Day at a Korean Café
A：오늘 왜 문 닫았어요?
o-neul wae mun dad-at-eo-yo?
Why are you closed today?
B：오늘 월요일이잖아요. 저희 월요일에 쉬거든요.
o-neul wol-yo-il-i-jan-a-yo. jeo-hui wol-yo-il-e swi-geo-deun-yo.
It’s Monday, you know. We’re closed on Mondays.
📌 Grammar Point: The first half uses 「잖아요」 to remind the listener of the mutually verifiable fact that “today is Monday.” The second half uses 「거든요」 to add the shop’s closing-day rule, which the listener did not previously know. The two endings each perform a different role within the same conversation.
▌Situation ②｜Confirming Dinner Plans With a Friend
A：오늘 저녁에 만나기로 했잖아요. 잊어버렸어요?
o-neul jeo-nyeog-e man-na-gi-ro haet-jan-a-yo. ij-eo-beo-ryeoss-eo-yo?
We agreed to meet tonight, remember? Did you forget?
B：아, 미안해요. 오늘 회의가 늦게 끝났거든요.
a, mi-an-hae-yo. o-neul hoe-ui-ga neut-ge kkeut-nass-geo-deun-yo.
Oh, sorry. My meeting ended late today.
📌 Grammar Point: A uses 「잖아요」 to remind B of an arrangement they already knew about, while B uses 「거든요」 to explain a reason for being late that A did not know. This is one of the most typical conversational pairings of these two endings.
Cultural Notes:
- In Korean drama dialogue, you will often hear 「-잖아」 and 「-거든」 pronounced with an extended final syllable or rising intonation. These informal forms are commonly used between close friends or romantic partners and sound more direct and emotionally expressive than the polite forms. Beginners can pay particular attention to actors’ intonation to get a better feel for the difference.
- When Koreans use 「잖아요」 to remind someone of something, using it too frequently can make the listener feel as though they are being questioned or criticized. For that reason, it is usually used with some restraint in real conversations rather than added to every sentence.
- When 「거든요」 is used by itself at the end of a sentence without another sentence following it, it can sometimes create a “let me tease this out first” effect. For example, if a friend asks “What happened?”, someone may begin with 「있잖아요…」 and then gradually explain. This kind of conversational rhythm appears quite often in Korean drama dialogue.
How Do Korean 「잖아요/거든요」 Compare With Japanese 「んです」?
◆ Similar Grammar: んです
The Japanese 「んです」 likewise has the function of explaining a reason or adding background information for the listener. Its usage is quite similar to 「거든요」 because both are often used to provide information the listener did not previously have. Compared with a plain statement, both sound more conversational and explanatory.
- Example: 今日は休みなんです
Kana: きょうはやすみなんです
Translation: We’re closed today.
This can be used when an employee explains the closing schedule to a customer who did not know about it. Its explanatory function is almost the same as 「오늘 쉬거든요」, since both add information that the listener did not previously know. - Example: 電車が遅れたんです
Kana: でんしゃがおくれたんです
Translation: The train was delayed.
This is used to explain the reason for being late. Its function is the same as Usage ① of 「거든요」: the speaker gives the result first, then conversationally adds the reason.
◆ The Core Difference From 「잖아요/거든요」:
Japanese 「んです」 does not clearly divide situations into separate endings based on whether the information is already known to the listener or still unknown. Korean, by contrast, separates these two perspectives quite clearly with 「잖아요」 and 「거든요」. This is one of the ways in which the Korean sentence-ending system is more finely differentiated than Japanese.
Once you understand 「잖아요」 and 「거든요」, it becomes easier to pick up the speaker’s real intention when listening to Korean drama dialogue or talking with Korean friends. Are they reminding you of something that was already mentioned, or adding a new reason you did not know yet? After using these two endings for a while, you will realize that the difference is not really about memorizing rigid grammar rules. It is about noticing, at the moment of speaking, who knows the information and who does not.
FAQs
「잖아요」 is used to remind or confirm something the listener already knows or is expected to know. It commonly appears when correcting someone’s misunderstanding or bringing shared memories and knowledge back into the conversation, with a nuance similar to “You know this already, right?”
The core difference is whether the listener already knows the information. 「잖아요」 is used for something the listener already knows, while 「거든요」 tells the listener a reason or piece of information they did not previously know. The two reflect opposite informational positions.
The most common mistake is treating them as synonyms and substituting one for the other. In particular, using 「잖아요」 when explaining a reason can make the listener feel as if they were already supposed to know the information, which can create confusion or unnecessary awkwardness.
Both endings are primarily conversational and are less common in formal written articles or business documents. In spoken Korean, the informal forms 「-잖아」 and 「-거든」 are more common between close friends, while the polite forms 「-잖아요」 and 「-거든요」 are used with older people or people you are not close to.
A simple rule is to remember: 「잖아요」 is for “reminding,” while 「거든요」 is for “explaining.” In conversation, first decide whether the information is something both people already know or something only you know, and it becomes much easier to choose the right ending.