이에요 / 예요: Polite Present (with Casual 이야/야) | Korean Grammar

이에요 / 예요 is the everyday polite (해요체) present form of the copula 이다 — the "is / am / are" you use with almost everyone in ordinary conversation. There are really only two things to get right about it: which of the two shapes to pick (that's decided by the noun's last sound), and how to spell the vowel-final one (that's where nearly every learner slips). Get those two, add the casual counterpart, and you own the copula for daily speech.

The rule: consonant vs. vowel

The copula's shape depends on whether the noun ends in a consonant (받침) or a vowel.

After a consonant, use 이에요:

저는 학생이에요.

jeoneun haksaeng-ieyo

I'm a student.

이분은 선생님이에요.

ibuneun seonsaengnimieyo

This person is a teacher.

After a vowel, use 예요:

저는 의사예요.

jeoneun uisayeyo

I'm a doctor.

그건 우유예요.

geugeon uyuyeyo

That's milk.

제 친구는 가수예요.

je chinguneun gasuyeyo

My friend is a singer.

Why the split happens: 이 + 에요

The two shapes aren't arbitrary — 이에요 / 예요 is the copula stem 이 fused with the polite ending 에요. Once you see that seam, the batchim rule stops being something to memorize and becomes something to predict.

After a consonant, the 이 has nothing in front of it to fuse with, so it survives intact: 학생 + 이에요 → 학생이에요.
After a vowel, the noun-final vowel pulls the 이 into the ending, and 이 + 에 contracts to 예: 친구 + 이에요 → 친구예요.

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The 예 in 예요 is a squeezed-together 이 + 에. That's the whole rule: after a consonant nothing squeezes, so you keep 이에요; after a vowel the 이 merges into 예. Picture the seam and you'll never have to look up which form to use.

This same logic explains the copula's most notorious spelling trap, below.

The number-one spelling error: 예요, not 에요

After a vowel it is 예요, with the 예 — never ×에요. 친구예요, not ×친구에요. 의사예요, not ×의사에요. The mistake is everywhere, even among native writers texting quickly, because 예요 and 에요 sound almost identical in fast speech. But the vowel-final copula must carry the fused 이 (the 예), so the spelling is fixed.

이거 제 거예요.

igeo je geoyeyo

This is mine.

Write 거예요, 예요, 가수예요, 우유예요 — the 예 is not optional decoration; it is the copula's 이. Drop it and you've dropped the copula.

The casual counterpart: 이야 / 야

반말 (intimate speech, used with close friends and children younger than you) forms the copula the same way, just minus the 요. The polite/casual forms track each other one-to-one:

Noun ends in…	Polite (해요체)	Casual (반말)
consonant (batchim)	이에요 — 학생이에요	이야 — 학생이야
vowel	예요 — 친구예요	야 — 친구야

The casual form obeys the identical consonant/vowel split: keep the 이 after a consonant (학생이야), drop it after a vowel (친구야).

야, 너 학생이야?

ya, neo haksaeng-iya

Hey, are you a student?

쟤가 내 친구야.

jyaega nae chinguya

That kid is my friend.

(Handy overlap: after a name ending in a vowel, 야 doubles as the vocative "hey _" — 민수야! — but the copula 야 above is the sentence-ending "is," a different hat worn by the same syllable.)

The copula's negative, 아니다 ("is not"), takes the polite ending 에요 too — giving 아니에요. And here the spelling flips the intuition you just built: because 아니 is a whole verb stem (not a noun with a fused copula 이), there is no 이 to turn into 예. So it stays 아니에요, never ×아니예요.

저는 학생이 아니에요.

jeoneun haksaeng-i anieyo

I'm not a student.

This is the exact mirror of the noun rule: nouns fuse 이 → 예 (친구예요), but 아니다 has no such 이, so it keeps the plain 에요 (아니에요). The negative copula has its own page.

One form, statement or question: only the intonation moves

Here is something English does not prepare you for. The very same 이에요 / 예요 serves as both the statement "is" and the yes/no question "is …?" Nothing in the words changes — no word order flips, no auxiliary appears. You simply let your voice rise at the end (and write a question mark). English rearranges the sentence ("You are a student" → "Are you a student?"); Korean leaves it untouched.

회사원이에요.

hoesawonieyo

I'm an office worker. (falling — statement)

회사원이에요?

hoesawonieyo

Are you an office worker? (rising — question)

이거 진짜 금이에요?

igeo jinjja geumieyo

Is this real gold?

So the whole job of turning a copula statement into a question in casual polite speech is carried by intonation alone. The same holds for the casual 이야/야: 학생이야 with a flat tone is "you're a student," and 학생이야? with a rising tone is "are you a student?" — identical words, different melody.

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Don't hunt for a "question form" of the copula in 해요체 — there isn't a separate one. 이에요/예요 does double duty; a rising pitch (and a "?") is the only difference between telling and asking. The dedicated question ending 이에요 → 인가요/이에요? nuances come later; the everyday move is just intonation.

Common Mistakes

1. Writing 에요 for 예요 after a vowel. The #1 copula error — the vowel-final form carries the fused 이 (예).

❌ 그건 우유에요.

Wrong spelling — after a vowel it's 예요.

✅ 그건 우유예요.

geugeon uyuyeyo

That's milk.

2. Over-generalizing 예요 onto a consonant-final noun. After a batchim you keep the full 이에요.

❌ 저는 학생예요.

Wrong — 학생 ends in a consonant, so it's 학생이에요.

✅ 저는 학생이에요.

jeoneun haksaeng-ieyo

I'm a student.

3. Keeping 이 in the casual form after a vowel. The vowel-final 반말 copula drops the 이.

❌ 쟤가 내 친구이야.

Wrong — after a vowel the casual copula is just 야.

✅ 쟤가 내 친구야.

jyaega nae chinguya

That kid is my friend.

4. Dropping 이 in the casual form after a consonant. The consonant-final 반말 copula keeps the 이.

❌ 너 학생야?

Wrong — after a consonant the casual copula is 이야.

✅ 너 학생이야?

neo haksaeng-iya

Are you a student?

5. Spelling the negative as 아니예요. 아니다 has no noun-final 이 to fuse, so it stays 아니에요.

❌ 이건 제 가방이 아니예요.

Wrong — 아니다 takes 에요, giving 아니에요.

✅ 이건 제 가방이 아니에요.

igeon je gabang-i anieyo

This isn't my bag.

Key Takeaways

Polite copula: 이에요 after a consonant (학생이에요), 예요 after a vowel (친구예요).
The split is a fusion: 이 + 에요; after a vowel the 이 merges into 예 — which is why the vowel-final form is 예요, never ×에요.
Casual 반말 tracks it exactly, minus 요: 이야 after a consonant (학생이야), 야 after a vowel (친구야).
The negative 아니다 keeps the plain ending: 아니에요, never ×아니예요 (no noun-final 이 to fuse).

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