공기청정기

In a sentence

• 공기청정기가 거실에 있어요.

  The air purifier is in the living room.

  Here, '공기청정기' functions as the subject of the sentence and refers to the physical device for air purification.

• 나는 공기청정기를 새로 샀어요.

  I recently bought a new air purifier.

  In this sentence, '공기청정기' is the object of the sentence and refers to the item being purchased.

• 요즘 공기청정기가 많이 팔려요.

  Air purifiers are selling well these days.

  Here, '공기청정기' represents the subject of the general statement, indicating a trend or observation about air purifiers.