-(으)ㄹ게(요): I'll (a Promise to You) | Korean Grammar

-(으)ㄹ게(요) is how you hand your own future action to the person in front of you as a commitment. 제가 할게요 is not a neutral "I'm going to do it" — it is "I'll do it, so don't worry about it." The whole meaning lives in that relationship to the listener: 려고 하다 reports a plan, -(으)ㄹ 거예요 predicts one, but -(으)ㄹ게요 promises one, in direct response to the person you are talking to. That single social fact explains everything else about it — including its two famous restrictions.

The shape

-(으)ㄹ게요 attaches to a verb stem, splitting by the final sound exactly like the neutral future:

Stem ends in…	Ending	Example
a vowel	-ㄹ게요	가다 → 갈게요
ㄹ (already)	-ㄹ게요 (keep the ㄹ)	만들다 → 만들게요
any other consonant	-을게요	먹다 → 먹을게요

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Spelling vs. sound: -(으)ㄹ게요 is pronounced with a tense [께] — 갈게요 sounds like [갈께요] — because of the ㄹ before it. But it is never spelled 께요. Write 갈게요, 할게요, 먹을게요, always with the plain ㄱ. (This is the regular tensification after a ㄹ-modifier; see tensification after an obstruent.)

The meaning: a responsive commitment

The key word is responsive. -(으)ㄹ게요 answers the listener or the situation. You use it to reassure, to volunteer, to take something on — always with an implied "…so you can count on me." That is why it saturates the small courtesies of daily life: service counters, phone sign-offs, offers of help.

제가 도와드릴게요.

jega dowadeurilgeyo

I'll help you (let me take care of it).

나중에 전화할게요.

najung-e jeonhwahalgeyo

I'll call you later.

오늘은 제가 살게요.

oneureun jega salgeyo

I'll treat you today.

금방 올게요. 여기서 기다려요.

geumbang olgeyo. yeogiseo gidaryeoyo

I'll be right back. Wait here.

It is also the set phrase Koreans say on the way out the door — 다녀올게요 ("I'll go and come back"), a small promise of return to whoever stays behind.

엄마, 학교 잘 다녀올게요.

eomma, hakgyo jal danyeoolgeyo

Mom, I'm off to school (and I'll be back).

In banmal, the ending is simply -(으)ㄹ게, dropping the 요.

걱정 마, 내가 꼭 갚을게.

geokjeong ma, naega kkok gapeulge

Don't worry, I'll definitely pay you back.

Constraint 1: first-person only

Because a -(으)ㄹ게요 sentence makes a promise, its subject must be the one who can make that promise — you, the speaker. You cannot commit on someone else's behalf, so a third-person subject is ungrammatical here. For someone else's future action, use the neutral -(으)ㄹ 거예요.

❌ 철수가 갈게요.

Wrong — you can't promise on Cheolsu's behalf. -(으)ㄹ게요 needs a first-person subject.

✅ 철수가 갈 거예요.

Cheolsuga gal geoyeyo

Cheolsu will go. (neutral prediction/plan)

The same logic rules out using it for detached facts about the world. Rain is not something you can promise, so a forecast never takes -(으)ㄹ게요.

❌ 내일 비가 올게요.

Wrong — the weather isn't yours to commit to; this needs a neutral prediction.

✅ 내일 비가 올 거예요.

naeil biga ol geoyeyo

It'll rain tomorrow.

Constraint 2: it cannot be a question

A promise is something you give, not something you ask. So -(으)ㄹ게요 has no question form — ×갈게요? is simply ungrammatical. To ask about the listener's wish or to propose something, switch endings: -(으)ㄹ래요? asks "do you want to…?", and -(으)ㄹ까요? asks "shall we…?"

❌ 우리 같이 갈게요?

Ungrammatical — -(으)ㄹ게요 can't be a question.

✅ 우리 같이 갈래요?

uri gachi gallaeyo?

Do you want to go together?

-(으)ㄹ게요 vs. -(으)ㄹ 거예요: promise vs. prediction

This is the pair to internalize. Both point to your own future action, but the stance differs completely:

-(으)ㄹ 거예요 is a neutral report of a plan or a prediction. It just states what will happen. It works for yourself, others, and the weather alike.
-(으)ㄹ게요 is a commitment to the listener. It reacts to them and reassures them.

저는 이번 주말에 집에 있을 거예요.

jeoneun ibeon jumare jibe isseul geoyeyo

I'm going to stay home this weekend. (just informing you of my plan)

알겠어요, 그럼 제가 집에 있을게요.

algesseoyo, geureom jega jibe isseulgeyo

Okay, then I'll stay home. (responding — you can count on it)

Feel the difference: the first merely announces a plan; the second offers to stay home because of something the listener said. Swap them and the tone breaks — 있을 거예요 in response to a request sounds detached, while 있을게요 out of nowhere sounds like you're reassuring someone who never asked.

-(으)ㄹ게요 vs. -(으)ㄹ래요: for you vs. for me

One more neighbor. -(으)ㄹ래요 also voices a first-person action, but it asserts your own preference — "I feel like… / I'd rather…" -(으)ㄹ게요 hands the action to the listener as a commitment; -(으)ㄹ래요 keeps it about your wish.

이 일은 제가 할게요.

i ireun jega halgeyo

I'll take care of this task. (committing to you)

저는 이 일을 할래요.

jeoneun i ireul hallaeyo

I want to do this task. (my preference / I choose this one)

So when a person asks you for a favor, the natural, cooperative answer is a -(으)ㄹ게요 commitment (네, 도와드릴게요), not a -(으)ㄹ래요 statement of preference, which would sound like you were merely announcing what you feel like doing.

Common Mistakes

1. Using it for a third person. Promises are first-person; predictions about others take -(으)ㄹ 거예요.

❌ 동생이 내일 올게요.

Wrong — you can't promise your sibling's action.

✅ 동생이 내일 올 거예요.

dongsaeng-i naeil ol geoyeyo

My sibling will come tomorrow.

2. Making it a question. Use -(으)ㄹ래요? or -(으)ㄹ까요? instead.

❌ 뭐 먹을게요?

Ungrammatical as a question.

✅ 뭐 먹을래요?

mwo meogeullaeyo?

What do you want to eat?

3. Spelling it 께요. The tense sound is automatic; the spelling stays 게요.

❌ 제가 할께요.

Misspelling — pronounced [할께요] but written 할게요.

✅ 제가 할게요.

jega halgeyo

I'll do it.

4. Attaching it to an adjective. -(으)ㄹ게요 is a commitment to act, so it takes action verbs, not descriptive ones. You can't promise to "be pretty."

❌ 제가 예쁠게요.

Wrong — 예쁘다 is descriptive; there's no action to commit to.

✅ 제가 예쁘게 꾸밀게요.

jega yeppeuge kkumilgeyo

I'll do myself up nicely.

Key Takeaways

-(으)ㄹ게(요) = "I'll do it (for you, count on it)" — a responsive commitment to the listener.
It is first-person only (no promising for others) and never a question.
Pronounced tense [께요] but always spelled 게요.
Contrast -(으)ㄹ 거예요 (neutral plan/prediction — anyone, even the weather) and -(으)ㄹ래요 (your own preference).
Takes action verbs, not adjectives.

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