Should / Duty / Intention

This pattern combines -아/어야 하다 (must/should) with the ending -지, which adds a nuance of "of course" or "don't you agree?". It's used to express a strong sense of obligation, duty, or personal intention that the speaker feels is obvious or natural.

Meaning & Usage

Meaning: Expresses something that "should" or "must" be done, often with a feeling that it's the right, natural, or obvious course of action.

When to use:

To state a general truth or social norm: 사람이 양심이 있어야지. (A person should have a conscience.)

To gently chide or remind someone of their duty: 약속은 지켜야지. (You should keep your promises.)

To talk to yourself, expressing a firm intention or resolution: 이제 자야지. (I should go to sleep now.)

Formation

Attach -아/어야지 to a verb or adjective stem.

Stems with final vowel ㅏ or ㅗ: Add -아야지

가다 → 가야지

보다 → 봐야지

Stems with other vowels: Add -어야지

먹다 → 먹어야지

지키다 → 지켜야지

있다 → 있어야지

하다 verbs: Becomes 해야지

공부하다 → 공부해야지

성공하다 → 성공해야지

사람이 양심이 있어야지. / 이제 자야지. / 약속은 지켜야지. / 잘못했으면 사과해야지.

While both patterns translate to "should" or "must," they carry different nuances.

-아/어야 하다/되다 (Objective Obligation)

Function: This is the standard, neutral way to state an obligation or necessity. It's objective and factual, like stating a rule.

Example: 약속은 지켜야 해요. (One must keep promises.) - This sounds like a general rule.

-아/어야지(요) (Subjective & Emphatic Obligation)

Function: This pattern is more subjective and personal. It adds the speaker's feeling that the obligation is obvious, natural, or a matter of course. It's less about a rule and more about common sense or personal resolve.

Example (to others): 약속은 지켜야지. (You should keep your promises, obviously.) - This implies the listener knows this and is being reminded.

Example (to self): 꼭 성공해야지. (I must succeed / I'm determined to succeed.) - This expresses strong personal will, not just a general need.

꼭 성공해야지. / 먹었으면 돈은 내야지. / 공부 열심히 해야죠. / 확인부터 해야죠.

The feeling of -아/어야지 changes dramatically based on who is speaking to whom. The speaker's attitude is key.

Self-Talk / Resolution (혼잣말)

When talking to yourself, it's a firm decision or a reminder to get something done.

Context: You've been procrastinating and realize it's late.

Line: 이제 자야지. (Right, I should go to sleep now.)

Gentle Chiding / Nagging (잔소리)

When an elder or parent says this to someone younger, it often carries a light scolding tone, implying "You should know better."

Context: A child isn't listening to their parents.

Line: 부모님 말씀 잘 들어야지. (You should listen to your parents.)

Stating an Obvious Truth (당연한 사실)

Used to state a social norm or common-sense principle as if it's self-evident and everyone should agree.

Context: Discussing someone who was dishonest.

Line: 사람이 솔직해야지. (A person should be honest, of course.)

이제 가야지. / 부모님 말씀 잘 들어야죠. / 사람이 솔직해야지. / 서로 도와야죠.

The pattern's politeness level is controlled by the final particle, -지 or -죠.

Casual Form: -아/어야지

Usage: This is the base form (반말). Use it when speaking to close friends, family members younger than you, or when talking to yourself (monologue).

Nuance: When directed at others, it can sound a bit like nagging or giving parental advice, as it implies the listener should already know what to do. When used for self-talk, it's a simple statement of intention.

Polite Form: -아/어야죠

Usage: This is the standard polite form (해요체). Use it with colleagues, acquaintances, elders, or in any situation where you would normally add -요.

Nuance: Adding -요 softens the statement significantly. It turns a potential command or criticism into a polite suggestion or a shared understanding. It sounds more like, "Of course, we should... right?" or "One should..., don't you think?"

밥은 먹고 다녀야지. / 밥은 먹고 다녀야죠. / 아프면 병원에 가야지. / 아프면 병원에 가야죠.