The Cleft: -는 것은 …이다 (What … is …)

Sometimes a plain sentence isn't enough — you want to spotlight one piece of it. English has two tools for this: the it-cleft ("It's coffee that I like") and the wh-cleft ("What I like is coffee"). Korean folds both of these into a single, elegant frame: nominalize everything except the spotlight with -는 것, mark that lump as the topic (은), and let the spotlighted element land in the predicate on 이다. The result — [clause]-는 것은 X이다 — is the Korean pseudo-cleft, and it is the backbone of emphatic, explanatory, and definitional speech at the advanced level.

The frame: [clause]-는 것은 X이다

The mechanism has three moves. First, take the part you already know (the presupposition) and turn it into a noun with -는 것 ("the thing that ~"). Second, mark it as the topic with 은 — this says "as for that." Third, put the new, focused information into the predicate slot and close with the copula 이다 (polite 이에요/예요).

Everything up to 것은 is old, presupposed information ("the thing I like — we already agree there is such a thing"); 커피 is the new answer, and it sits in the copula slot. Compare the flat 저는 커피를 좋아해요 ("I like coffee"): the cleft doesn't add facts, it reorganizes them so 커피 is the point.

Clefting a person, a time, a place

The focused element doesn't have to be a plain object. Nominalize the clause with a head that fits — 사람 for a person, or keep the neutral 것/거 — and spotlight whoever or whenever you like.

Notice the second example: the whole clause 우리가 처음 만난 ("that we first met") is nominalized with 건, and the time — 작년 여름 — is dropped into the predicate. English would say "It was last summer that we first met"; Korean fronts the known part and lets the new part land on 이다.

Copula agreement and tense — the trap

Because the focused element sits on 이다, the copula has to agree with it and carry the right tense. This is exactly where advanced learners slip. Two things to watch:

The 이에요 / 예요 split. After a consonant-final noun, use 이에요 (사랑이에요); after a vowel-final noun, use 예요 (커피예요, 언니예요). This is the ordinary copula 이에요/예요 rule, but the cleft makes it easy to forget because your attention is on the long nominalized topic.

Tense lives on the copula. If the clefted fact is in the past, the past tense goes on 이다, not (only) inside the relative clause: 이었어요 after a consonant, 였어요 after a vowel.

Here the meeting is past and "being a teacher (at that time)" is past, so the copula takes 이었어요. Getting the copula's form and tense right is the single most technical part of producing clefts.

The explanatory 거예요 (것이다)

A close cousin of the cleft uses the same 것이다 / 거예요 ending not to spotlight a noun but to frame a whole explanation — "the thing is that ~," "that's why ~." You nominalize the reason or circumstance and present it as the copula's content. It adds a note of "let me explain / here's the deal."

You can also cleft a whole embedded fact — the problem, the reason, the point — with -는/-다는 거예요:

Here 문제는 sets the topic, and the entire fact 돈이 없다 ("there's no money"), nominalized with -다는 거, lands in the predicate. For the machinery of embedding a fact this way, see the fact-that clause with -다는 것; for -는 것 as a plain nominalizer and as a head-noun for clauses, see their pages.

The reframe: one frame for two English constructions

English keeps its two clefts structurally separate — the it-cleft moves the focus to the front ("It's effort that matters") while the wh-cleft moves it to the back ("What matters is effort"). Korean doesn't need two structures because its word order and particles already do the work: the presupposition always becomes a 것-nominalized topic (은) at the front, and the new, focused information always drops into the final copula (이다) slot. So both English clefts collapse into one Korean template — [what you already know]-는 것은 [the new part]이다 — where word order + 은/는 + 이다 together carry out the focusing.

The cleft also pairs naturally with contrast, as here (아니라 "not X but Y"). For the broader system of setting one element against another, see contrastive 은/는 and fronting.

Common Mistakes

Mistake 1 — Leaving the focus in an ordinary argument slot. When you want emphasis, a flat sentence buries it; use the cleft to raise it into the predicate.

Mistake 2 — Wrong copula form (이에요 vs 예요). The copula agrees with the focused noun's final sound.

Mistake 3 — Forgetting past tense on the copula. If the clefted fact is past, the tense must show on 이다.

Mistake 4 — Using 것을 instead of the topic 것은. The nominalized presupposition is the topic, so it takes 은, not the object marker 을.

Key Takeaways

• The Korean pseudo-cleft is [clause]-는 것은 X이다: nominalize the known part with -는 것, mark it topic 은, drop the new element into the copula slot.
• It handles English's it-cleft and wh-cleft with one frame; word order + 은/는 + 이다 do the focusing.
• Watch the copula: 이에요 after a consonant, 예요 after a vowel, and put past tense on 이다 (이었어요 / 였어요) when the fact is past.
• The 거예요 (것이다) frame extends this to whole explanations — "the thing is that ~," "that's why ~" — including 문제는 …-다는 거예요.