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아/어야 되다/하다

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1.

Necessity to do something

Must, have to
Express an obligation or necessity to do something.
Example
  • 내일 시험이 있어요. 그래서 공부해야 돼요.
    I have an exam tomorrow. So I must study.
  • 감기에 걸리지 않기 위해서 따뜻한 옷을 입어야 해요.
    You should wear warm clothes to avoid catching a cold.
  • 늘 너무 피곤해요. 집에서 쉬어야 돼요.
    I am so tired today. I have to rest at home.

Negative forms

아/어야 되다/하다 has 2 negative forms:

  1. 지 않아도 되다 = not necessary to do something.
  2. (으)면 안 되다 = prohibition of some behavior.
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