Words That Are Already Negative: 없다, 아니다, 모르다

Most Korean negation is a bolt-on: park 안 in front of a verb, or hang -지 않다 on the end, and any predicate becomes its own negative — 가요 → 안 가요, 좋아요 → 좋지 않아요. But three of the most common verbs in the language refuse this treatment. Their negative is not a construction you build; it is a separate word you look up. 있다 "to exist / to have" negates to 없다; 이다 "to be (something)" negates to 아니다; 알다 "to know" negates to 모르다. Linguists call these suppletive negatives — the negative form is supplied by an unrelated stem, the way English "go" reaches for "went" instead of "goed." Try to regularize them with 안 and you produce Korean that no native speaker says.

This is worth its own page precisely because it is not a rule you can generalize. It is a short, closed list to memorize — and once memorized, it removes three of the most persistent beginner errors at a stroke.

The three pairs at a glance

없다: the negative of "there is" and "I have"

Korean has no single verb "to have." It says, literally, "as for me, money exists" (돈이 있어요) for "I have money." The mirror image — "I don't have money" — is therefore not built with 안; it swaps the whole verb: 돈이 없어요. The same word covers both "there isn't" (existence) and "I don't have" (possession), because in Korean those are the same idea.

An English speaker's instinct is to reach for "not exist" as ✗안 있어요, by analogy with 안 가요. Block that instinct. There is one word — 없다 — and it does the whole job.

아니다: the negative of the copula, and the particle trap

The copula 이다 "to be (something)" — as in 학생이에요 "(I) am a student" — does not negate to ✗안 이다 either. Its negative is the standalone adjective 아니다 "is not (the case)." So "I am a student" (학생이에요) becomes "I am not a student" (학생이 아니에요).

Here is the detail that trips up almost everyone, and it is the single most valuable thing on this page. 아니다 marks its complement with the subject particle 이/가, not the object particle 을/를. You say 의사가 아니에요, never ✗의사를 아니에요.

Why 가 and not 를? Because 아니다 is grammatically an adjective meaning roughly "is-not-the-case," and the noun in front of it is its subject-complement, not an object being acted on. Parse 의사가 아니에요 as "as-for-me, [the state of being] a-doctor is not so." Nothing is receiving an action, so there is no room for the object particle 를. English hides this because "I am not a doctor" looks just like "I hit a ball"; Korean exposes it by demanding 가. The moment you feel tempted to write 를 after a noun before 아니다, stop — it is 가. The full copula picture lives on 아니다: the negative copula.

모르다: the negative of "to know"

알다 "to know" is the third. Its everyday negative is 모르다 "to not know / to be ignorant of." A learner reaching for ✗안 알아요 sounds, to a Korean ear, roughly like saying "I un-know" — it simply is not a form.

Notice that 모르다 takes its object with 을/를 (그 사람을 몰라요) — unlike 없다 and 아니다. That is because 모르다 is a genuine transitive-ish verb of cognition, patterning with 알다: you know a thing (알아요), you don't know a thing (몰라요). So the three suppletives split on argument marking: 없다 and 아니다 take 이/가, while 모르다 keeps 을/를 like its positive twin 알다.

Why 안 and -지 않다 are blocked

The deep reason is that these negatives are lexical, not grammatical. 안 and -지 않다 are productive machinery — they attach to any predicate to derive a negative on the fly. But 없다, 아니다, and 모르다 are not derived at all; they are their own dictionary entries, each the historical negative counterpart of its partner. Korean already has the negative word, so the machinery has nothing to do — and running it anyway (✗안 있다) collides with a slot that is already filled.

The practical payoff of seeing them as ordinary, self-standing predicates is that they behave like any other verb or adjective in every other respect:

• They conjugate for tense on their own. Past: 없었어요, 몰랐어요, 아니었어요.
• They take honorifics on their own. 없으세요 "(you/he/she) doesn't have," 모르세요 "(you) don't know," 아니세요 "(you) are not."
• They can even be negated a second time for special effect — 없지 않다 "it's not that there isn't (some)," a deliberate double negative — which is why you meet them again under negation scope and double negation.

That independence is the whole point. Because they are real words and not constructions, they slot into the grammar exactly where 있다 / 이다 / 알다 would — you just have to reach for the right word.

Common Mistakes

1. Regularizing existence with 안. The classic. "There isn't" is 없어요, never ✗안 있어요.

2. Regularizing "know" with 안. "I don't know" is 몰라요, never ✗안 알아요.

3. Marking 아니다's complement with 을/를. The particle before 아니다 is 이/가, always.

4. Using 안 이다 for "is not." The copula's negative is 아니다, a whole different word.

5. Confusing 아니다 (not that thing) with 없다 (not there). 아니다 denies an identity; 없다 denies existence/possession. "It's not a problem" is 문제가 아니에요; "there's no problem" is 문제가 없어요 — related but not interchangeable. The contrast has its own page: 아니다 vs 없다.

Key Takeaways

• Three high-frequency verbs have suppletive negatives — separate words, not 안/-지 않다 constructions: 있다→없다, 이다→아니다, 알다→모르다.
• ✗안 있어요, ✗안 알아요, ✗안 이에요 are all wrong; reach for the dedicated word.
• 아니다 and 없다 take their noun in 이/가 (의사가 아니에요, 시간이 없어요); 모르다 keeps 을/를 like 알다 (그 사람을 몰라요).
• They are ordinary predicates in every other way — they carry their own tense (없었어요, 몰랐어요) and honorifics (없으세요, 모르세요).