Korean Grammar Point
아/어/여서는 안 되다 [a/eo/yeoseoneun an doeda] (Must not, shouldn't)

Used to express prohibition; 'must not', 'shouldn’t'.

Formation

Verb stem + 아/어/여서 + 는 안 되다

Examples

이 병원에서는 담배를 피워서는 안 됩니다. 건강에 매우 해롭습니다.

I byeongwoneseoneun dambaereul piwoseoneun an doemnida. Geongange maeu haeropseumnida.

You must not smoke in this hospital. It’s very harmful to health.

비밀인 사실을 다른 사람에게 말해서는 안 됩니다. 신뢰를 잃을 수 있어요.

Bimilin sasireul dareun saramege malhaeseoneun an doemnida. Sinloereul il-eul su isseoyo.

You must not reveal a secret fact to others. You could lose their trust.

시험 중에는 친구와 대화해서는 안 됩니다. 불공정한 행위로 간주될 수 있어요.

Siheom jungeneun chinguwa daehwahaseoneun an doemnida. Bulgongjeonghan haengwiro ganjudoel su isseoyo.

You must not talk with a friend during an exam. It can be considered cheating.

숙제를 너무 빨리 해서는 안 돼요. 이해가 안 되면 꼭 선생님께 질문해야 해요.

Sukjereul neomu ppalli haeseoneun an dwaeyo. Ihaega an doemyeon kkok seonsaengnimkke jilmunhaeya haeyo.

You shouldn’t rush through your homework. If you don’t understand something, you must ask the teacher.

Long Explanation

The construction '아/어/여서는 안 되다' conveys that a certain action is forbidden or must not happen. It’s similar to 'You must not…' or 'You shouldn’t…' in English. Typically, we use the verb stem, attach 아/어/여서, and then add '는 안 되다.'

Detailed Grammar Notes

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Public Alpha version Open Source (GitHub). This site is currently undergoing active development. You may (will) encounter bugs, inconsistencies, or limited functionality. Lots of sentences might not sound natural. We are progressively addressing these issues with native speakers.


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