Could someone tell me how to say in Korean:

  1. mustn't [it is forbidden] {One mustn't kill people.}

  2. don't have to [it isn't forbidden but unnecessary] {I don't have to clean my room.}

  • Can you share what you have tried to find the answer, like a dictionary look up or an incomplete translation?
    – user17915
    Dec 30, 2020 at 11:25
  • I don't really understand the question. I couldn't find the answer anywhere. I tried to look it up in the "Wordreference" dictionary.
    – Taman
    Dec 30, 2020 at 11:58

1 Answer 1


1. mustn't

  • 해서는 안 된다
  • 하지 말아야 한다
  • 하면 (절대) 안 된다
  • etc.


  • 살인해서는 안 된다.
  • 살인하지 말아야 한다.
  • 살인하면 안 된다.

2. don't have to

  • (하지 않아도/안 해도) (좋다/된다/괜찮다/...)
  • 할 필요(가/는) 없다
  • etc. etc.


  • 방을 청소할 필요는 없다.
  • 방 청소 안 해도 된다.
  • 방을 청소하지 않아도 괜찮다.
  • Sorry, could you indicate the basic form? Like this: verb stem + an ending. I can't understand it. Thank you in advance!
    – Taman
    Dec 30, 2020 at 16:48

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