Expressing 'need to' — Korean Grammar

To express obligation, necessity, or duty ("have to", "must", "need to"), Korean uses a grammatical structure combining a conjugated verb stem with the ending (ya), followed by an auxiliary verb.

The two most common auxiliary verbs used in this pattern are (tœ·dadoe·datoe·datway·ta) and (ha·daha·daha·daha·ta).

Basic Construction

To form this structure, you must first conjugate the verb stem as if you were forming the present tense, but attach (ya) instead of the usual sentence ending.

If the verb stem ends in (a) or (o), add (a·ya).
If the verb stem ends in any other vowel, add (ŏ·yaeo·yaŏ·yae·ya).
For (ha·daha·daha·daha·ta) verbs, change (ha·daha·daha·daha·ta) to (hæ·yahae·yahae·yahay·ya).

After this connection, you add the auxiliary verb.

가다 → 가야 돼요
ka·da → ka·ya twæ·yoga·da → ga·ya dwae·yoka·da → ka·ya twae·yoka·ta → ka·ya tway·yo
to go → I have to go
먹다 → 먹어야 해요
mŏk·da → mŏ·gŏ·ya hæ·yomeok·da → meo·geo·ya hae·yomŏk·da → mŏ·gŏ·ya hae·yomek·ta → me·ke·ya hay·yo
to eat → I must eat

Difference between 되다 (tœ·da) and 하다 (ha·da)

While (ya tœ·daya doe·daya toe·daya tway·ta) and (ya ha·daya ha·daya ha·daya ha·ta) are often interchangeable in meaning, there is a nuance in usage.

1. 야 되다 (ya tœ·da) - Spoken/Colloquial

This is the most common form in spoken Korean. Literally, it means "only if you do X, it will work/become." It focuses on the result: the situation will be okay if the action is performed.

지금 출발해야 돼요.
chi·gŭm chʰul·bal·hæ·ya twæ·yo.ji·geum chul·bal·hae·ya dwae·yo.chi·gŭm ch'ul·bal·hae·ya twae·yo.ci·kum chul·pal·hay·ya tway·yo.
I need to leave now.
이 약을 먹어야 돼요.
i yak·ŭl mŏ·gŏ·ya twæ·yo.i yak·eul meo·geo·ya dwae·yo.i yak·ŭl mŏ·gŏ·ya twae·yo.i yak·ul me·ke·ya tway·yo.
You have to take this medicine.

2. 야 하다 (ya ha·da) - Written/Formal

This form is slightly more formal and is preferred in writing, speeches, or objective statements. Literally, it means "only if you do X, you do." It focuses more on the moral obligation or the duty itself.

학생은 열심히 공부해야 합니다.
hak·sæng·ŭn yŏl·sim·hi kong·bu·hæ·ya ham·ni·da.hak·saeng·eun yeol·sim·hi gong·bu·hae·ya ham·ni·da.hak·saeng·ŭn yŏl·sim·hi kong·bu·hae·ya ham·ni·da.hak·sayng·un yel·sim·hi kong·pu·hay·ya ham·ni·ta.
Students must study hard.
우리는 규칙을 지켜야 해요.
u·ri·nŭn kyu·chʰig·ŭl chi·kʰyŏ·ya hæ·yo.u·ri·neun gyu·chig·eul ji·kyeo·ya hae·yo.u·ri·nŭn kyu·ch'ig·ŭl chi·k'yŏ·ya hae·yo.u·li·nun kyu·chig·ul ci·khye·ya hay·yo.
We must follow the rules.

The Casual Short Form 야지 (ya·ji)

In casual speech ( (pan·malban·malpan·malpan·mal)) or self-talk, the final auxiliary verb is often dropped completely, leaving just the ending (ya·jiya·jiya·jiya·ci). This form expresses a strong determination to oneself ("I gotta do this") or a casual reminder to a close friend.

Unlike the other forms, you cannot attach the polite particle (yo) to (ya·jiya·jiya·jiya·ci). It is strictly casual.

늦었다! 빨리 가야지.
nŭ·jŏtt·da! bbal·li ka·ya·ji.neu·jeott·da! bbal·li ga·ya·ji.nŭ·jŏtt·da! ppal·li ka·ya·ji.nu·cett·ta! ppal·li ka·ya·ci.
I'm late! I gotta go quickly.
너도 청소해야지.
nŏ·do chʰŏng·so·hæ·ya·ji.neo·do cheong·so·hae·ya·ji.nŏ·do ch'ŏng·so·hae·ya·ji.ne·to cheng·so·hay·ya·ci.
You have to clean up, too.

Past Obligation

To say you "had to" or "needed to" do something in the past, you conjugate the final auxiliary verb ( (tœ·dadoe·datoe·datway·ta) or (ha·daha·daha·daha·ta)) into the past tense.

어제 일해야 했어요.
ŏ·je il·hæ·ya hæss·ŏ·yo.eo·je il·hae·ya haess·eo·yo.ŏ·je il·hae·ya haess·ŏ·yo.e·cey il·hay·ya hayss·e·yo.
I had to work yesterday.
한 시간 기다려야 됐어요.
han si·gan ki·da·ryŏ·ya twæss·ŏ·yo.han si·gan gi·da·ryeo·ya dwaess·eo·yo.han si·gan ki·da·ryŏ·ya twaess·ŏ·yo.han si·kan ki·ta·lye·ya twayss·e·yo.
I had to wait for one hour.

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