English gives you a single word — what — to say "the thing that." I bought what you wanted. What you said is true. Korean has no such word. To say "the thing that I bought," Korean does two things at once: it fronts the whole modifying clause before a noun (as always in Korean), and it plugs in the bound noun 것 as the head that the clause attaches to. 내가 산 것 is literally "[I bought]-것" = "the thing [that] I bought." Learn this and you have unlocked the machinery behind Korean's gerunds, its clefts, and half of natural spoken Korean.
Why Korean needs 것
A Korean modifying clause must always land on a noun — you cannot leave a modifier dangling with nothing after it. In modifiers before nouns you saw 내가 산 책 ("the book I bought"): the clause 내가 산 attaches to the head noun 책. But what if there is no specific noun — you just mean "the thing"? Then Korean supplies the all-purpose bound noun 것 as a placeholder head.
이건 제가 만든 거예요.
igeon jega mandeun geoyeyo
This is something I made.
Here 제가 만든 ("I made") modifies 거 (것), and the whole phrase 제가 만든 거 means "the thing I made." 것 carries no meaning of its own — it is a grammatical hook, "the thing / the one," waiting for a clause to define it.
것 takes the normal attributive endings
Because 것 is just a noun, the clause in front of it ends in exactly the same attributive (modifier) endings as any relative clause — and those endings still carry the tense. So the tense of "the thing that…" lives on the verb, not on 것:
| Form | Ending | Meaning |
|---|---|---|
| 하는 것 | -는 (present) | the thing (one) that … does / is doing |
| 한 것 | -(으)ㄴ (past) | the thing that … did |
| 할 것 | -(으)ㄹ (prospective) | the thing that … will do / is to do |
| 하던 것 | -던 (retrospective) | the thing that … used to do / was doing |
A past-clause head:
어제 산 거 어디 있어요?
eoje san geo eodi isseoyo
Where's the thing I bought yesterday?
A present-clause head (an object-head clause — "the thing that is needed"):
필요한 게 뭐예요?
piryohan ge mwoyeyo
What is it that you need? (lit. the needed thing is what?)
A prospective-clause head — "the thing (that) I'll do / should do":
내가 할 걸 알려 주세요.
naega hal geol allyeo juseyo
Tell me the thing (that) I should do.
Notice 할 걸 is written with a space: it is the attributive 할 plus the head 것을 → 걸. (Written solid as 할걸, it would instead be the regret ending "I should have…" — a completely different word.) The space is doing real work.
The spoken contractions: 거 · 게 · 걸 · 건
것 is one of the most heavily contracted words in Korean. In anything but careful writing, 것 becomes 거, and 것 plus a particle fuses:
| Full (written) | Contracted (spoken) | Example |
|---|---|---|
| 것 | 거 | 산 거 (the thing I bought) |
| 것이 | 게 | 필요한 게 (the thing that's needed) |
| 것을 | 걸 | 할 걸 (the thing I'll do) |
| 것은 | 건 | 원하는 건 (the thing I want) |
| 것이다 | 거다 / 거예요 | 만든 거예요 (it's the thing I made) |
In everyday speech these contractions are not optional flourishes — they are the default. Saying the full 것이 / 것을 out loud sounds bookish and stiff.
제가 원하는 건 딱 하나예요.
jega wonhaneun geon ttak hanayeyo
The thing I want is just one thing.
아까 산 걸 잃어버렸어요.
akka san geol ireobeoryeosseoyo
I lost the thing I bought earlier.
지금 제일 급한 게 이거예요.
jigeum jeil geupan ge igeoyeyo
The most urgent thing right now is this.
"What you said" = a clause + 것, not a bare word
This is the pattern English speakers most often reach for and most often build wrong. English "what you said," "what I want," "what happened" all use one word, what. Korean must render each as [clause] + 것:
네가 말한 걸 이해했어요.
nega malhan geol ihaehaesseoyo
I understood what you said.
네가 말한 거 다 기억나요.
nega malhan geo da gieongnayo
I remember everything you said.
There is no way to say 말한 alone and mean "what you said" — the clause has to land on 것. The same logic runs through 원하는 것 ("what one wants"), 일어난 것 ("what happened"), 본 것 ("what one saw"). Wherever English uses what as a noun, expect a Korean 것-clause.
Referential 것 vs. the nominalizer 것
The 것 on this page is referential: it points at a thing, an object, an item — "the one that." 내가 산 것 is a physical thing you could hold. That same 것, attached to a whole clause, does a second job — it packages an entire event or fact into a noun ("the act of exercising," "the fact that he came"). That propositional use is the -는 것 nominalizer, and the focus-marking 것이다 cleft grows out of it. They share the same little word; this page is the referential root of both.
Common Mistakes
1. Dropping 것 and leaving the modifier dangling. A Korean modifying clause cannot end a phrase — it needs a noun to land on. Without 것, there is nothing there.
❌ 내가 산 어디 있어요?
Incorrect — 내가 산 modifies nothing; the head noun 거 is missing.
✅ 내가 산 거 어디 있어요?
naega san geo eodi isseoyo
Where's the thing I bought?
2. Not contracting to 게 / 걸 / 건 in speech. The uncontracted forms are correct but sound stilted in conversation.
❌ 제가 원하는 것은 딱 하나예요.
Grammatically fine but bookish in speech — a native would contract 것은 to 건.
✅ 제가 원하는 건 딱 하나예요.
jega wonhaneun geon ttak hanayeyo
The thing I want is just one thing.
3. Freezing on 하는 것 and never marking tense. The tense sits on the attributive ending, so "the thing I bought" is 산 것 (past), not 사는 것 (present).
❌ 어제 사는 거 어디 있어요?
Incorrect — 사는 is present ('the thing I buy'); for yesterday you need the past 산.
✅ 어제 산 거 어디 있어요?
eoje san geo eodi isseoyo
Where's the thing I bought yesterday?
4. Splitting 할 걸 vs. writing 할걸. With a space, 할 걸 is "the thing I'll do" (것을). Written solid, 할걸 is the regret ending "I should have done it." Keep the space when you mean the head noun.
Key Takeaways
- Korean has no word for "what / the one that." You front the clause and supply the head noun 것: 내가 산 것 = "the thing I bought."
- 것 takes the ordinary attributive endings, so the tense lives on the verb: 하는 것 / 한 것 / 할 것 / 하던 것.
- In speech 것 contracts hard: 것 → 거, 것이 → 게, 것을 → 걸, 것은 → 건, 것이다 → 거예요. These are the default, not optional.
- This referential 것 ("the thing/one that") is the root of the -는 것 clause nominalizer and the cleft.
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Start learning Korean→Related Topics
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- Choosing -기 vs -(으)ㅁ vs -는 것TOPIK 3 — A decision guide for Korean's three nominalizers: -기 for unrealized activities and set frames, -(으)ㅁ for fixed written facts, and -는 것 for everything spoken and concrete — sorted by aspect and register.