Korean Contractions: The 거/게/걸/건 Your Textbook Skips

이것은 무엇이에요? You can read that. Igeoseun mueosieyo, "What is this?" Now here is the version a Korean person actually says: 이건 뭐예요? Igeon mwoyeyo? Same question, three syllables shorter, and two separate words have changed shape on you.

If you can pass a written Korean test and still lose the thread thirty seconds into a drama, this is usually the reason. Not vocabulary. Not speed. Korean contractions are the gap: the words you memorized get physically shorter in speech, and nobody handed you the conversion chart.

A spoken language, written down

How To Study Korean's Lesson 26 spends a full lesson on ~는 것, the construction that turns verbs into nouns, and runs on 것이, 것은, and 것을 the whole way through. The words "contract," "shorten," "colloquial," and "spoken" appear zero times on the entire page. Lesson 35, on 것 같다, uses 것 같 more than ninety times and 거 같 not once.

Here's the part I enjoy. Lesson 26's own vocabulary section contains this sentence:

어제 비행기표를 알아봤는데 싼 게 없어요. Eoje bihaenggipyoreul arabwanneunde ssan ge eopseoyo. "I looked into plane tickets yesterday but there aren't any cheap ones."

싼 게 is 싼 것이, contracted. The author reached for the spoken form by reflex while formally teaching only the long one, and never flagged it.

HTSK is one of the best free Korean resources in English, and it does introduce the contraction back in Lesson 9: "것 is also sometimes shortened to 거, for no other reason than it is easier to say and creates a shorter sentence." Seventeen lessons later the connection has gone quiet. That's what happens to any written explanation of a spoken language. 국립국어원, South Korea's national language institute, describes 거 as 구어적: the colloquial way of saying 것. The label is accurate, and it is also the whole problem, because you're learning Korean off a page.

Korean contractions start with one table: 것, 거, 게, 건, 걸

것 becomes 거. That part is easy. What breaks your ear is what happens when a particle lands on it:

Two syllables fuse into one. LearnKorean24's lesson on 는 것 puts the pairs side by side:

• 다리가 아파서 걷는 것이 힘들어요 → 걷는 게 힘들어요 ("my legs hurt, so walking is hard")
• 영화를 보는 것은 제 취미예요 → 보는 건 제 취미예요 ("watching movies is my hobby")
• 저는 등산하는 것을 싫어해요 → 등산하는 걸 싫어해요 ("I hate hiking")

Read the left column and you hear 것 arrive, then the particle. Two beats. Real speech gives you 게. One beat. If your ear is waiting for 것 before it commits, it waits forever, and by the time you've registered that something went past, the sentence is three words down the road.

The particle hiding inside those fused syllables is one you already study separately. 게 has 이 in it, 건 has 은. If you're still sorting out which of those two a sentence wants, the contraction doesn't change that question. It just hides the evidence.

이게, 이건, 이걸: same rule, different hat

이것이 무엇이에요? is the version that lives on the page. 이게 뭐예요? ("what's this?") is the version that comes at you out loud. Demonstratives fuse the identical way, so one rule buys you nine forms:

Elon.io's grammar reference puts it bluntly: "When a 것/거 word meets a particle, Koreans almost always fuse them. Saying the full forms isn't wrong, but it sounds bookish." Which is the half that matters to a listener. If the long forms are the bookish ones, the fused forms are what's actually arriving at your ear.

One form is worth singling out. Reaching for a subject marker, it's tempting to bolt 가 onto 이거 and produce 이거가. The subject form you'll actually hear is 이게, the fusion of 이것 and 이.

From LearnKorean24's lesson on 거/게/걸/건 and Elon.io: 이건 지갑이에요 ("this is a wallet"), 그게 맛있어요? ("is that one tasty?"), 저걸 어디서 샀어요? ("where did you buy that one?"), 이게 더 좋아요 ("this one's better"). Nine forms, and they're the ones that surface when somebody asks you about an object in a shop or a kitchen.

This is not a politeness thing

Take three sentences you just read. 전 괜찮아요 ("I'm fine", with 저는 squeezed to 전). 이게 더 좋아요. 저걸 어디서 샀어요? All three are contracted. All three are polite 해요체, the register you'd use with a colleague or a stranger on the street. The contractions did nothing to the politeness.

This matters because plenty of explanations file contractions under "casual" and long forms under "formal." LearnKorean24's own lesson says 는 것 "sounds a little more formal" than 는 거. Learners read that and conclude they should say 이것은 to a shopkeeper out of respect. You'd sound like a court filing.

The way I'd frame it: three separate dials are getting collapsed into one here. Politeness (존댓말 vs 반말) is set by your verb ending, so 좋아요 is polite and 좋아 is not, and that's a separate system with its own rules. Contraction rides the spoken-Korean-versus-written-Korean line instead: 게, 건, and 걸 belong to speech, while 것이, 것은, and 것을 belong to the page. Particle dropping is the third.

The spoken-written dial does lean on the formality dial a little, which is what LearnKorean24 is picking up on. So the dials aren't sealed off from each other. But shortening 것 to 거 won't make you ruder, and stretching it back out won't make you politer.

Particle dropping, the third dial, is the one that really does track casualness. 밥 먹었어? with no 을 on 밥, 나 갈래 with no 는 on 나. Elon.io calls dropping "a register dial, not a grammar rule".

Casual still isn't 반말, though. 밥 먹었어? is 반말 because of the 어 ending, and 밥 먹었어요? drops exactly the same particle while staying polite.

The rest of the short list

무엇 is the one to fix first. In speech you get 뭐 instead, which Wiktionary traces back through 무어, and it turns up in question after question aimed at you: 이게 뭐예요? Miss this one contraction and you lose the word "what" for the length of a conversation.

The topic marker does the same trick on pronouns and places, from Miri Choi's list:

• 저는 → 전 (전 괜찮아요, "I'm fine")
• 나는 → 난
• 너는 → 넌
• 여기는 → 여긴, 거기는 → 거긴, 저기는 → 저긴 ("here", "there", "over there")
• 에는 → 엔 (서울에는 → 서울엔, "in Seoul")

Every one of those steals the syllable your ear was using to find the boundary between the topic and everything said about it. The object marker runs the same play: 나를 → 날, as in 날 봐 ("look at me").

Then -지요 → -죠, the polite tag ending that closes confirmation questions: 회의가 오후 두 시에 시작하죠? "The meeting starts at 2 PM, right?" Wiktionary gives 죠 as a contraction of 지요. It lands at the very end of the sentence, in the slot where your attention is already unclenching, which is why it slips past.

And 것 같다 becomes 거 같다. Someone asked 국립국어원 directly whether 좋을 거 같아요 is acceptable alongside 좋을 것 같아요, and the answer was that both are correct.

The same sentences, twice

저는 밥을 먹을 것이에요. Now say 저는 밥을 먹을 거예요. Say both out loud, back to back, and listen to the second one lose a beat. That drop is what your ear has to survive in real time, which is why these are worth speaking rather than skimming.

저는 밥을 먹을 것이에요. / 저는 밥을 먹을 거예요. "I will eat rice."

나는 내일 친구를 만날 것이야. / 나는 내일 친구를 만날 거야. "I will meet my friend tomorrow."

이 문제를 극복하는 것이 힘들 거예요. / 이 문제를 극복하는 게 힘들 거예요. "It will be difficult to overcome this problem."

The first two pairs are HTSK's own, from the lesson where it says the two versions are "exactly the same". The third is from Lesson 26, and it's the most useful one here, because HTSK wrote 것이 and 거예요 in a single sentence without noticing. The right-hand column is what you'd hear.

Being honest about what this drill does: you're producing both versions yourself, so you always know which one is coming. That teaches your mouth the compression. Your ear still needs the real thing.

How to retrain the ear

Pick a scene you've already watched with subtitles, three or four minutes of two people talking. Play it again with your eyes closed and your hand off the pause button, and count only the 게, 건, and 걸 you catch. You may only get two or three on the first pass. Run it again the next day and the number climbs, which tells you something useful: the words were always there, and what changed is that you stopped waiting for 것.

Then fix the input side. When you hit 것이 on a page, say 게. When you hit 것을, say 걸. Let your eyes go on processing textbook Korean, but run the spoken version through your mouth, because the spoken version is the one you have to recognize at conversational speed.

Watch the seams. 게, 건, and 걸 turn up right after a verb modifier: 하는 게, 먹는 걸, 보는 건. Once you expect a contraction in that slot, a mystery syllable turns into a familiar one.

Keep this separate from the other thing that reshapes spoken Korean. Batchim and liaison change sounds automatically at syllable boundaries, whether the speaker intends it or not, which is why 좋아요 comes out of a native mouth as [조아요] with nobody making a decision. Those are sound rules, applied by the mouth. Contractions are shortcuts a speaker chooses, and you can say the full form any time without breaking anything. Both strand a reading-trained ear, by different routes.

A table gets you the mapping. Automatic recognition comes from hearing 게 land where you were braced for 것이, in a sentence you didn't write and can't rewind. That's the argument for talking to an actual person, or to an AI conversation partner like Conversa you can be sloppy in front of at 1am.

Next time a Korean line goes past too fast and you're certain you didn't know the words, test the assumption. There's a decent chance you knew every word. You just weren't expecting 것이 to show up as 게. That's a one-syllable problem wearing a vocabulary problem's coat, and it's a much smaller thing to fix.