muni jadongeuro dathyeoyo.

subject particle

Breakdown of muni jadongeuro dathyeoyo.

• 문: door
• 자동으로: automatically
• 닫히다: to close

Questions & Answers about muni jadongeuro dathyeoyo.

Why is it 문이 and not 문을?

Because 문 is the subject here, not the direct object.

The verb is 닫히다, which means to close / to be closed. With this verb, the door is the thing that undergoes the action, so it takes the subject marker 이/가:

• 문이 닫혀요 = The door closes / is closed

  Compare that with 닫다, which is transitive and needs an object:

• 문을 닫아요 = Someone closes the door

So:

• 문이 닫혀요 → the door closes
• 문을 닫아요 → someone closes the door

What does 자동으로 mean, and why does it end in -으로?

자동으로 means automatically.

It comes from:

• 자동 = automatic operation / automation / automatic
• -으로 = a particle that can mean by, with, through, or can turn some nouns into adverb-like expressions

So 자동으로 literally has the sense of by automatic means, which is why it is naturally translated as automatically.

You will see this pattern a lot:

• 버스로 가요 = go by bus
• 한국어로 말해요 = speak in Korean
• 자동으로 열려요 = opens automatically