How to Use Korean Modal Verbs to Express Ability, Possibility, and Obligation

Learning Korean modal verbs is essential for expressing abilities, possibilities, and obligations. These verbs help you communicate more accurately and naturally in various situations. This article explains how to use the main Korean modal verbs for these purposes.

Understanding Korean Modal Verbs

Modal verbs in Korean are auxiliary verbs that modify the main verb to indicate the speaker’s intention or attitude. The most common modal verbs are -다 forms such as 할 수 있다 (can do), 아/어/여야 하다 (must), and 아/어/여도 되다 (may, allowed).

Expressing Ability

To express ability, use the modal -다 form -(을/를) 수 있다. This phrase means “can” or “be able to.” For example:

  • 나는 한국어를 할 수 있다. — I can speak Korean.
  • 그는 수영을 할 수 있다. — He can swim.

Expressing Possibility

Possibility is often expressed with the same -(을/를) 수 있다 structure, indicating that something might happen or be possible. Context and additional words can clarify the degree of possibility:

  • 비가 올 수 있다. — It might rain.
  • 그 일이 가능할 수도 있다. — That thing might be possible.

Expressing Obligation

Obligation or necessity is expressed with -아/어/여야 하다, meaning “must” or “have to.” The verb stem changes depending on the vowel harmony:

  • 공부해야 한다. — I have to study.
  • 숙제를 해야 돼요. — You must do your homework.

Summary

In Korean, modal verbs like -(을/를) 수 있다 express ability and possibility, while -아/어/여야 하다 indicates obligation. Mastering these verbs will enhance your ability to communicate effectively in Korean and express a range of intentions and conditions.