-는데 (neunde) in Korean: Why It Isn’t Just “But”

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Many learners first meet -는데 translated as “but”, and then keep finding it where “but” makes no sense: before a question, inside a request, or at the end of a sentence with nothing after it. The confusion goes away once you stop looking for a single English word.

The one idea: situation first, main point second

The Standard Korean Language Dictionary (표준국어대사전) defines the connecting ending -는데 as the ending you use to mention, in advance, the situation related to what the next clause will explain, ask, request or suggest. The Basic Korean Dictionary (한국어기초사전) says the same thing more briefly. Neither definition mentions contrast. A -는데 sentence has two slots:

Keep slot 1 the same, change slot 2, and watch what the English translation has to do:

English needed a different connector each time, or none. Korean used the same ending in all six. If you translate -는데 as “but”, the question, the request and the suggestion all come out wrong. If you read it as “here is the situation”, all six make sense.

Which form? 는데, 은데 or 인데

The choice depends first on what kind of word comes before the ending, and only then on the final consonant. The dictionaries list three entries: -는데, -은데 and -ㄴ데.

Word	Type	With -는데	Romanisation
가다 · 먹다	verb	가는데 · 먹는데	ganeunde · meongneunde
살다	verb, ㄹ stem (ㄹ drops)	사는데	saneunde
있다 · 없다	existence	있는데 · 없는데	inneunde · eomneunde
맛있다 · 재미없다	ends in 있다 / 없다	맛있는데 · 재미없는데	masinneunde · jaemieomneunde
비싸다 · 조용하다	adjective, vowel	비싼데 · 조용한데	bissande · joyonghande
작다 · 좋다	adjective, consonant	작은데 · 좋은데	jageunde · joeunde
멀다	adjective, ㄹ stem (ㄹ drops)	먼데	meonde
춥다	adjective, ㅂ irregular	추운데	chuunde
학생이다	noun + 이다	학생인데	haksaenginde
갔다 · 추웠다	any past form	갔는데 · 추웠는데	ganneunde · chuwonneunde
갈 것이다	a plan	갈 건데	gal geonde

Two smaller points. A plan uses -(으)ㄹ 건데, short for -(으)ㄹ 것인데, so a plan can be the background too: 주말에 부산에 갈 건데 같이 갈래요? (jumare busane gal geonde gachi gallaeyo?, I'm going to Busan this weekend. Do you want to come?). And after a noun ending in a vowel, the 이 of 이다 can drop in speech, as in the Standard Korean Language Dictionary's own example 그 옷은 얼만데? (geu oseun eolmande?, So how much is that outfit?), from 얼마인데.

Five jobs, one idea

1. Background before a question, request or suggestion

You give the listener the situation first, so that what you ask for makes sense.

Try reading “but” into the first sentence: I'm lost, but help me. There is no contrast in the Korean. The first clause simply tells the listener why you are asking.

2. Contrast, the soft way

When the main point goes against the background, the sentence reads as a contrast, and English needs “but”. The contrast comes from the content, not from -는데 itself. Putting 은/는 on the two things being compared often makes it clearer.

The Standard Korean Language Dictionary lists a sentence just like the second one among its own examples for the connective. Because the ending only lays out the facts, the contrast feels softer than it does with -지만. -는데 lets the listener notice the clash; -지만 announces it.

3. Opening a story or a topic

In storytelling, the first clause introduces the scene or the topic, and the second says what you actually wanted to tell. English uses “and” or “when”.

Notice that the second sentence would need “when” in English. That is the same background idea again: the first clause sets the scene, and the second tells what happened in it.

4. -는데요: leaving the main point unsaid

Add 요 and stop after slot 1. The listener hears the situation and fills in the conclusion. The Basic Korean Dictionary describes this -는데요 as stating a situation while expecting the listener to respond. Because the uncomfortable part is never said aloud, it works well for hesitating, correcting someone and turning something down.

5. Sentence-final -는데: surprise, or a question

At the end of a sentence, -는데 (casual) or -는데요 (polite) can also express mild surprise or admiration. Both dictionaries describe it as exclaiming about something while waiting for the listener's reaction. It is still the same idea: you point out the situation and leave the reaction open.

Add a question word and the same ending asks for a specific answer. Both dictionaries list this as a sense of its own. It often follows on from what the other person has just said, as in this reply:

-는데 or -지만?

-지만 has a single job. The Basic Korean Dictionary defines it as accepting what came before and adding a fact that is opposite or different. So when a sentence really is a contrast, both endings work. When the first clause is only background, -지만 does not fit.

A quick check: if “but” sounds wrong in the English, -지만 will sound wrong in the Korean. When the contrast is the whole point, for example in an essay that sets two opinions against each other, -지만 says it directly and cannot be read as background. The other common linking endings are compared in -고, -아서, -니까.

-는데 or -는 데? One space, a different word

데 is also a noun. The Basic Korean Dictionary gives it three meanings: a place, a thing or activity, and a case or situation. Because it is a separate word, the Korean spelling rules (Article 42 of 한글 맞춤법) put a space before it, while the ending -는데 is written solid.

One step further: -는데도

Add 도 and the background becomes an obstacle. -는데도 means “even though”: the second situation happens regardless of the first. Hanguljo teaches it one level later, at TOPIK 4, and it follows all the forms above (비싼데도, 학생인데도, 먹었는데도).

Frequently asked questions

What does 는데 mean in Korean?

-는데 puts a situation on the table before the main point. It does not say how the two parts are related, so English translates it as and, but, so, when or a full stop, depending on what follows: 배고픈데 밥 먹으러 갈래요? means I'm hungry. Shall we go and eat?

Does 는데 mean but?

Only when the main point goes against the background, as in 비싼데 맛있어요 (it's expensive, but it's good). In 길을 잃었는데 좀 도와주세요 (I'm lost. Could you help me?) there is no contrast at all. If you only mean but, -지만 is the unambiguous choice.

When do you use 는데, 은데 and 인데?

Verbs, 있다 and 없다 (and words ending in them, such as 맛있다) take 는데: 가는데, 먹는데, 맛있는데. Adjectives take ㄴ데 after a vowel or ㄹ (비싼데, 먼데) and 은데 after other consonants (작은데, 좋은데). Nouns take 인데: 학생인데. In the past, everything takes 았/었는데: 갔는데, 추웠는데.

What does 는데요 mean at the end of a sentence?

It states the situation and leaves the conclusion to the listener. That makes it sound soft, which is why it is used to hesitate, correct someone or turn something down: 오늘은 좀 바쁜데요… (I'm a bit busy today…). It can also express surprise or admiration, often with a rising tone: 생각보다 잘하는데요? (You're better at this than I expected!) or 이 책 생각보다 재미있는데요 (This book is more fun than I expected).

What is the difference between 는데 and 는 데?

-는데 with no space is the ending: 학교에 가는데 친구한테서 전화가 왔어요 (I was on my way to school when a friend called). 데 with a space is a noun meaning place, thing or situation: 학교에 가는 데 30분 걸려요 (It takes 30 minutes to get to school). If you can add a particle such as 에 or 가 after 데, write the space.

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