changmuneul orae dada dumyeon bangi seuphaeseo gibuni dapdaphaeyo.

If I leave the window closed for a long time, the room gets humid and I feel stuffy.

Breakdown of changmuneul orae dada dumyeon bangi seuphaeseo gibuni dapdaphaeyo.

• ~이: subject particle
• ~을: object particle
• 창문: window
• 방: room

Questions & Answers about changmuneul orae dada dumyeon bangi seuphaeseo gibuni dapdaphaeyo.

What does 닫아 두면 mean, and why isn’t it just 닫으면?

닫아 두다 is 닫다 + 아/어 두다.

This pattern often means:

• do something and leave it that way
• keep something in that state

So:

• 창문을 닫다 = to close the window
• 창문을 닫아 두다 = to leave the window closed / keep the window shut

Then -면 adds if/when, so 닫아 두면 means if/when you leave it closed.

If you said 닫으면, that focuses more on the act of closing it.
닫아 두면 focuses more on the continued state after closing.

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Why is it 창문을 and not 창문이?

Because 닫다 is a transitive verb: you close something.

So the thing being closed takes the object marker:

• 창문을 닫다 = close the window

If you used 창문이, you would usually need a different verb, such as:

• 창문이 닫히다 = the window closes / is closed

So in this sentence, 창문을 is correct because the window is the object of 닫아 두다.

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What does 오래 mean here? Is it the same as 오랫동안?