changmuneul yeon chaero nagasseoyo.

-ㄴ/은 채로 means while remaining in that state, without changing that condition, or leaving something as it is.

So in 창문을 연 채로 나갔어요, the idea is:

• the window was opened,
• and that state continued
• when the person left.

A natural English translation is They left with the window open or They went out leaving the window open.

It is different from simply saying two actions happened in sequence. It emphasizes the state that remained.

The verb is 열다 (to open).

Before 채로, Korean uses a form based on the verb’s modifier form:

• 열다 → 연

This happens because 열다 is an ㄹ-irregular verb in this pattern. The ㄹ drops before endings that begin with ㄴ, ㅂ, ㅅ, etc.

So:

• 열다 → 연
• 만들다 → 만든
• 살다 → 산

That is why it is 창문을 연 채로, not 열 채로.

창문을 uses the object particle 을 because 창문 is the thing being opened.

In the base action:

• 창문을 열다 = to open the window

Even though the whole phrase becomes 창문을 연 채로, the window is still understood as the object of 열다.

So:

• 창문 = window
• 을 = object marker
• 연 = opened
• 채로 = in that state

Together: with the window left open

나가다 means to go out, to leave, or to exit.

So:

• 가다 = to go
• 나가다 = to go out / leave

In this sentence, the person is leaving a place, so 나가다 fits better than plain 가다.

• 창문을 연 채로 나갔어요 = They went out / left with the window open

If you used 갔어요, it would sound more like simply went, without the clear sense of going out from a place.

Not exactly. It looks related to a past/completed action, but here 연 is better understood as a modifier form meaning opened.

It describes the noun-like idea implied before 채로:

• 연 채로 = in an opened state

So it is not the main verb tense of the sentence. The actual tense and politeness of the whole sentence are shown by 나갔어요.

• 나가요 = go out
• 나갔어요 = went out / left

So the sentence is past because of 나갔어요, not because of 연 alone.

This is a very common question.

창문을 열고 나갔어요

This means:

• opened the window and then left

It focuses on two actions in sequence.

창문을 연 채로 나갔어요

This means:

• left while the window remained open
• left with the window open

It focuses on the remaining state of the window.

So:

• 열고 = did action A, then did action B
• 연 채로 = did action B while state A remained

Sometimes both can be translated similarly in English, but the nuance is different.

Often, yes, it can suggest that the state was left that way, sometimes carelessly or unintentionally. But that feeling comes from context, not from 채로 all by itself.

For example:

• 창문을 연 채로 나갔어요 can sound like
  They left without closing the window
  and may imply Oops, they forgot.

But it could also be neutral, depending on the situation:

• Maybe the room needed air.
• Maybe someone intentionally left it open.

So 채로 mainly describes a continued state, and any feeling of carelessness depends on context.

The subject is omitted, which is very normal in Korean.

창문을 연 채로 나갔어요 could mean:

• I left with the window open
• He/She left with the window open
• They left with the window open

Korean often leaves out the subject when it is clear from context.

So the sentence does not tell you by itself who left. You figure that out from the conversation or situation.

Not in the same way.

창문을 연 채로 나갔어요

This means the subject left, and the window was left open.

창문이 열린 채로

This means with the window being open or in a state where the window is open.
열리다 is the passive/intransitive form: to be opened.

You might say:

• 창문이 열린 채로 있었어요 = The window stayed open
• 문이 열린 채로 잠들었어요 = I fell asleep with the door open

But 창문이 열린 채로 나갔어요 sounds less natural if the person is the one leaving and you want to emphasize they left the window open. In that case, 창문을 연 채로 나갔어요 is the usual expression.

Yes. It is very common with many verbs to show doing something while a state remains unchanged.

Examples:

• 문을 닫은 채로 잤어요.
  I slept with the door closed.

• 신발을 신은 채로 들어왔어요.
  He came in with his shoes on.

• 불을 켠 채로 잤어요.
  She slept with the light on.

• 가방을 든 채로 서 있었어요.
  He was standing while holding a bag.

A very common pattern is:

• N을/를 + verb modifier + 채로

meaning:

• with N in the state of having been verbed

Both can relate to a state, but they are not used in exactly the same way.

-채로

Attached to a verb form, and often feels natural in everyday speech.

• 창문을 연 채로 나갔어요
• 불을 켠 채로 잤어요

상태로

Literally means in the state/condition of and is more noun-based. You often see:

• 열린 상태로
• 그 상태로

For example:

• 창문이 열린 상태로 있었어요.
  The window remained in an open state.

In many situations, 채로 sounds more natural when talking about leaving something as it is while another action happens.

나갔어요 is in the standard polite style, often called 해요체.

So the whole sentence is polite but not overly formal.

Levels for comparison:

• 창문을 연 채로 나갔어요. = standard polite
• 창문을 연 채로 나갔습니다. = more formal
• 창문을 연 채로 나갔어. = casual

So if you are speaking politely in normal conversation, 나갔어요 is very natural.

You would usually change the main verb, because the tense of the sentence is shown there.

Present-like / habitual

• 창문을 연 채로 나가요.
  (He/She) goes out with the window open / leaves with the window open

Future / intention / guess

• 창문을 연 채로 나갈 거예요.
  (He/She) will go out leaving the window open

The 연 채로 part stays the same because it describes the state: with the window opened/open. The time reference comes from the main verb.

Yes, very natural.

창문을 연 채로 나갔어요 is a normal everyday way to say that someone left while the window was still open.

It is especially natural when:

• you are noticing a remaining condition,
• you are mildly criticizing or pointing out a problem,
• or you simply want to describe what state something was left in.

For example:

• 누가 창문을 연 채로 나갔어요?
  Who left with the window open?
• 창문을 연 채로 나가면 안 돼요.
  You shouldn’t leave with the window open.