Korean Future Tense: -ㄹ 거예요 (I'm going to) vs -ㄹ게요 (I promise I will)

You can already say what you did (먹었어요) and what you’re doing (먹어요). The last piece of the everyday tense set is the future — and this is where English quietly trips you up.

English has one word for it: will. “I’ll eat later.” “I’ll call you, I promise.” Same word, right? Korean uses two different endings, and they are not interchangeable. One is for a plan or a guess; the other is a promise you’re making to the person in front of you. Reach for the wrong one and you sound slightly off — not wrong enough for anyone to correct, just a little off.

Here’s the good news you’ll want up front: the spelling rule is one you already learned back with 을/를. If you survived that, the hard part is done.

The two “wills,” side by side

They can describe the same event — going tomorrow — but they do different jobs. 거예요 just puts your plan on the table. ㄹ게요 hands the listener a small promise: I’m telling you I’ll do this. ==거예요 announces a plan; ㄹ게요 makes a promise.==

That’s the whole distinction, and the rest of this lesson makes it stick.

The spelling rule: you already know it

To build either ending, you start from the dictionary form (the ~다 word), chop off 다, and look at what’s left — the same 받침 check you did for 을/를.

“받침” = the consonant that sits at the bottom of a syllable. 먹 has one (ㄱ); 가 does not.

• No 받침 (stem ends in a vowel) → add ㄹ 거예요 / ㄹ게요
• Has 받침 (stem ends in a consonant) → add 을 거예요 / 을게요

• 가다 → 가 (no 받침) → 갈 거예요🔊 / 갈게요🔊
• 먹다 → 먹 (has a 받침) → 먹을 거예요🔊 / 먹을게요🔊

The ㄹ from “ㄹ 거예요” drops straight onto the bottom of the vowel stem: 가 + ㄹ → 갈. And when there’s already a 받침, you slot in 을 to carry the sound: 먹 + 을 → 먹을.

💡 The 거예요 part comes from 것이에요 (“it is [that I will]”) — squeezed down in speech to 거예요. You don’t need to unpack it; just say 거예요.

Hear the 받침 split

Same ending, one verb with a bottom consonant and one without. Tap them and listen for where the 을 sneaks in:

💡 Words · 가다 → go · 먹다 → eat · 보다 → see/watch · 읽다 → read

The vowel-ending verbs (가다, 보다) just take a ㄹ at the bottom. The consonant-ending ones (먹다, 읽다) get an 을. You already have the habit of checking for a 받침 from 을/를 — the new move is just dropping a ㄹ onto a vowel stem (가 → 갈).

When it’s a plan or a guess: -ㄹ 거예요

Use 거예요 to lay out what’s going to happen — whether it’s your plan, someone else’s, or just your best guess about the world. It doesn’t care who the subject is.

That middle one is the tell: you can’t promise the weather. 비가 올 거예요 is a guess about something out of your hands — so only 거예요 fits here, never ㄹ게요. That single fact separates the two endings more cleanly than any grammar chart.

💡 Words · 내일 — tomorrow · 영화 — movie · 비 — rain · 오다 → come (rain “comes” in Korean)

When it’s a promise to the listener: -ㄹ게요

ㄹ게요 is different in feel: you’re reacting to the person you’re talking to and committing to do something. It’s always about you (the speaker), and it always lands on the listener like a small promise.

Swap in 갈 거예요 and 살 거예요 and it still means “I’ll come / I’ll buy” — but it flips your promise back into a flat statement of your plans, which can sound oddly distant when you’re responding to someone right in front of you. In these reply moments, ㄹ게요 is what a native reaches for.

💡 Words · 제가 — I (the polite 저 changes shape to 제 before 가). You saw 저는 back in an earlier lesson; 제가 is the same I, just with the 이/가 particle.

💡 The one rule that keeps you safe: ㄹ게요 is only ever about you. You can’t say 친구가 갈게요 (“my friend will-promise go”) — a promise has to be yours to make. If the subject isn’t I, use 거예요.

Where the two collide (the trap)

Same English, two different Korean sentences. This is the moment English fails you:

The friend’s first question uses 거예요 — they’re asking about your plan, so you answer with 거예요 (쉴 거예요). But the moment the conversation turns into you making a promise back to them, you switch to ㄹ게요 (갈게요). Same conversation, and the ending flips the instant you go from describing your plan to promising the person in front of you. English would say “will” for both. Korean makes you choose — and once you feel the difference, you won’t mix them up.

💡 Words · 주말 — weekend · 쉬다 → rest · 또 — again

Now say your own

Turn each dictionary form into the future. Say it out loud before opening the answer. Remember: no 받침 → ㄹ, has 받침 → 을.

1. 사다 (buy) — say the plain “I’m going to buy” form.

answer

살 거예요🔊 — 사 has no 받침 → add ㄹ on the bottom → 살 → 살 거예요. (I’m going to buy)

2. 읽다 (read) — this stem ends in a consonant. “I’m going to read” =?

answer

읽을 거예요🔊 — 읽 ends in a consonant (it has a 받침), so it takes 을 → 읽을 거예요. (I’m going to read) Same as 먹 → 먹을. (You don’t need to name the consonant — “has a 받침” is all the rule cares about.)

3. A friend asks you to call them tonight. You promise. 전화하다 (to call) — which ending?

answer

전화할게요🔊 — you’re promising the listener, so it’s ㄹ게요, not 거예요. 하다 → 할 → 전화할게요. (I’ll call you.)

Quick check

Q1 — plan or promise? You want to say “It’ll probably snow tomorrow.” Is it 눈이 올 거예요 or 눈이 올게요?

answer

눈이 올 거예요🔊 — it’s a guess about the weather, and you can’t promise snow. Only 거예요 works. (올게요 would mean you are promising to snow — impossible.) 눈 = snow.

Q2 — the 받침 split. 자다 (sleep) has no bottom consonant. What’s “I’m going to sleep”?

answer

잘 거예요🔊 — no 받침 → ㄹ on the bottom → 잘 → 잘 거예요. (I’m going to sleep) If you wrote 자을 거예요, you slotted in 을 where there was no consonant to carry it — vowel stems just take ㄹ.

Q3 — make it, don’t just read it. A friend asks 이거 누가 봐요? (“Who’s going to look at this?”). You want to promise you’ll look. From 보다, say it out loud, then check.

answer

제가 볼게요🔊 — a promise to the listener → ㄹ게요. 보 has no 받침 → ㄹ on the bottom → 볼 → 볼게요. (I’ll take a look.) You picked ㄹ게요, not 거예요, because you’re volunteering to the person right there.

One thing to watch for later (not today)

A couple of common verbs shift a sound before this ending — they look regular but aren’t. You don’t need them yet; just know they’re coming so they don’t throw you:

• 듣다 (listen) → 들을 거예요, not 듣을 거예요
• 돕다 (help) → 도울 거예요, not 돕을 거예요

These are the same irregular verbs that bend in the past tense, and they get their own lesson. The regular rule above covers the huge majority of what you’ll actually say — build the habit first, meet the exceptions later.

Before you go

• Two “wills”: 거예요 = a plan or a guess · ㄹ게요 = a promise to the listener
• The safety rule: ㄹ게요 is only ever about you — you can’t promise on someone else’s behalf (or the weather’s)
• The spelling is the 을/를 rule again: no 받침 → ㄹ, has 받침 → 을 (갈 거예요 · 먹을 거예요)
• 하다 → 할 거예요 / 할게요

📌 Pocket cheat sheet: plan → -ㄹ/을 거예요 · promise → -ㄹ/을 게요. 갈 거예요 · 먹을 거예요 · 할게요.

You can now talk across all three tenses — 먹었어요 (ate), 먹어요 (eat), 먹을 거예요 (will eat). That’s the everyday tense set complete. Next up, a word that feels perfectly safe in English but quietly marks you as a foreigner the moment it leaves your mouth: 당신.