-는데 Korean Grammar: Background, Contrast, and -는데요

-는데 is the connective English speakers meet constantly and still mistranslate as “but.”

Sometimes it contrasts. Often it only sets the scene. Koreans also end sentences on -는데요 and leave the rest for you to infer.

This page begins with the background and lead-in use. The related -는데② page looks more closely at contrast. They use the same forms, so context—not the shape alone—decides the reading.

Forms

Polite sentence-final: add 요 → 가는데요, 좋은데요, 학생인데요.

Three jobs

1. Background setup

The first clause is the situation. The second is what matters now.

내일 시험인데 아직 공부 못 했어요.
I’ve got a test tomorrow, and I still haven’t studied.

지금 비가 오는데 우산이 없어요.
It’s raining, and I don’t have an umbrella.

English may insert “and,” “but,” or nothing. Korean marks the setup with -는데.

2. Soft contrast

Weaker than a hard “but.” Closer to “though” or a gentle turn.

맛있긴 한데 좀 짜요.
It is tasty, though it’s a bit salty.

For a blunter contrast you will later meet -지만. Do not rush there — -는데 is what conversation reaches for first.

3. Trailing off (-는데요)

The “main clause” stays unspoken. The listener is expected to finish the move: soft refuse, invite a response, or leave a hint.

오늘은 좀 바쁜데요.
I’m a bit busy today… (so maybe not / so what’s your plan?)

그거 제가 산 건데요.
That’s the one I bought… (so why are you…?)

This is why textbooks that only gloss “-는데 = but” fail in real talk.

Do not confuse it with -아서/어서

-아서/어서 claims cause. -는데 claims situation.

피곤해서 일찍 잤어요.     ✅  tired → so I slept (cause)
피곤해 보이는데 일찍 자세요.   ✅  you look tired — sleep early / setup for suggestion
피곤해서 일찍 주무세요.   △  A command normally needs another reason form

When the second half is a suggestion or request, -(으)니까 or a -는데 setup is safer than -아서.

Practice rule

If you are tempted to say “but” in English, ask: am I really opposing, or am I just loading context? If it is context, -는데 is probably the Korean you heard.