문을

In a sentence

• 나는 문을 열었다.

  I opened the door.

  Here, '문을' (door) acts as the object of the verb '열었다' (opened), indicating the act of opening the door.

• 문을 닫고 나갔다.

  I closed the door and went out.

  In this sentence, '문을' serves as the object of the verb '닫고' (closed), describing the action taken upon the door.

• 택배가 문을 열고 들어왔다.

  The delivery person opened the door and came in.

  Here, '문을' again functions as the object of '열고' (opened), illustrating the action involving the door in the context of someone entering.