Negative past Tense in Korean: Meaning, Rules and Examples

Key facts

• The negative past puts 안 or 못 before a verb that is already in the past: 안 갔어요 (didn't go), 못 갔어요 (couldn't go).

What you'll learn

• Say "didn't" and "couldn't" in the polite past: 안 갔어요 and 못 갔어요.
• Form the negative past of action verbs, 하다 verbs, adjectives and 이다.
• Use the long forms -지 않았어요 and -지 못했어요 correctly in writing.
• Say "not yet" with 아직 안 + past.
• Avoid the spelling mix-up between 안 and 않.

Before you start: you should know the short negatives 안 negation in Korean and 못 can't in Korean, and the past tense in past tense -았/었-. Audio plays only when you press a button.

What Is the Negative past Tense in Korean?

The negative past tense in Korean is the pattern that says an action did not happen or could not happen. It has two parts: the negative word 안 (did not, by choice or as a fact) or 못 (could not, because of a block), and a verb in its past form. The past form is the verb stem plus -았/었- and the polite ending, such as 갔어요 from 가다.

Two First Examples

Two sentences show the pattern. The Revised Romanization (RR) is South Korea's official Latin spelling and is only an aid here.

• 어제 학교에 안 갔어요. (eoje hakgyoe an gasseoyo.) [안 가써요] = "I didn't go to school yesterday." This was a choice or a plain fact, perhaps because yesterday was a holiday.
• 어제 학교에 못 갔어요. (eoje hakgyoe mot gasseoyo.) [몯 까써요] = "I couldn't go to school yesterday." Something stopped you, such as illness.

In both sentences the word before the verb has no past marker; only 갔어요 does. The next section shows how every kind of verb fits.

How Does the Negative past Work?

The negative past works by adding the past form of the verb after 안 or 못, and nothing else changes. First make the past form of the positive verb, then put the negative word in front. The table shows the pattern for five common verbs, in four ways.

There are three points to notice in the table. First, the short forms use the whole past verb after the negative word: 안 먹었어요 is 안 + 먹었어요. Second, 하다 verbs split, with 안 or 못 between the noun and 했어요, as explained in negating 하다 verbs 공부 안 해요. Third, the long forms put the past on the helper verb: 가지 않았어요 has the past -았- on 않다, not on 가다.

Pronunciation of the Negative Past

The spelling does not change, but the sound does. The final ㄴ of 안 and the final ㅅ of 못 interact with the next syllable. The National Institute of Korean Language (국립국어원) standard pronunciation rules describe these changes.

• 안 갔어요 is [안 가써요]. The final ㅆ of 갔 carries over to the next syllable, so you hear 써.
• 못 갔어요 is [몯 까써요]. The final ㅅ of 못 sounds like ㄷ, and the ㄱ after it becomes the tense [ㄲ].
• 안 먹었어요 is [안 머거써요], and 못 먹었어요 is [몬 머거써요]. The final ㅅ of 못 turns into a nasal ㄴ before ㅁ.

Listen and copy the audio. RR hides these changes, writing mot meogeosseoyo for [몬 머거써요].

The sound changes are small, so the key skill is building the right sentence, which the worked example shows.

Worked Example: Building a Negative past Sentence

Follow the steps to turn "I ate breakfast" into "I didn't eat breakfast."

1. Write the positive past sentence. 아침을 먹었어요. (achimeul meogeosseoyo.) = "I ate breakfast." The verb is 먹었어요, from 먹다 + 었 + 어요.
2. Check the past form first. Do this step before adding the negative. If the verb were 가다, the past would be 갔어요, since 가 + 았 contracts to 갔.
3. Choose the negative word. Ask whether you chose not to eat (안) or something stopped you (못). If you were not hungry, choose 안.
4. Insert the word before the whole past verb. Put 안 in front of 먹었어요, with a space.
5. Read the result. 아침을 안 먹었어요. (achimeul an meogeosseoyo.) [안 머거써요] = "I didn't eat breakfast."

You will know it worked when the verb is still in its full past form and 안 is a separate word in front. The most common slip at step 4 is inserting the negative word inside the verb, as in 먹안었어요. Keep it in front. The form is simple, but real sentences bring in more verb types.

How Does the Negative past Change for Adjectives and 이다?

Adjectives follow the same pattern with 안, while 이다 and 있다 use special forms. The short list covers the cases you will need.

Three rules sit behind the table. 춥다 (to be cold) changes its stem to 추우- before a vowel, so its past is 추웠어요; 안 comes in front. The negative of 이다 is a different word, 아니다 (to be not), and its past is 아니었어요. And for existence, Korean has a dedicated word, 없다, so "there wasn't" is 없었어요 and not 안 있었어요. See 이었어요/였어요 past of 이다 for the positive pattern.

With the form clear, the next question is how the negative past differs from its close relatives.

How Is the Negative past Different from Similar Forms?

The negative past differs from the negative present only in the verb, and from the long form only in register. The table lines up four neighbours of 안 갔어요.

Choose by time and register. The time word often helps: 어제 (yesterday) and 지난주에 (last week) signal the past, so use 갔어요 with them. The long form is common in news, essays and tests, but a friend would find it stiff in a text message. To compare the two long forms with the short forms, see -지 않다 negation.

Knowing the neighbours, the next section covers when the pattern fits and where it does not.

Using the Negative past: When and When Not

Use the negative past to report something that did not happen before now, and avoid it for present habits or future plans. These rules cover the usual situations.

• "Not yet." 아직 안 먹었어요 means "I haven't eaten yet." Korean uses the past form with 아직 (still, yet) where English uses "haven't." The action has not happened up to now, and that is what the past form reports.
• Answering a question. The question 숙제했어요? (Did you do your homework?) can be answered 아니요, 숙제 안 했어요 (No, I didn't). See negative questions in Korean for answers to questions that already contain a negative.
• Giving a reason. The pattern fits a reason: 비가 와서 못 갔어요 (I couldn't go because it rained).
• Not for commands. A past form cannot give an order. Use -지 마세요 don't for "please don't."
• Not for habits in the present. For "I don't usually eat breakfast," use the present: 아침을 안 먹어요.

An honest limit: this lesson covers the polite forms -아요/-어요 only. The same pattern works in casual speech (안 갔어, 못 갔어) and in formal speech (안 갔습니다, 가지 않았습니다), but the endings are taught in the speech-level lessons.

The patterns above give a feel for the right use, and the mistakes below show where learners slip.

What Mistakes Do Learners Make with the Negative Past?

Learners most often misplace the past marker, confuse 안 with 않, or choose the wrong negative word. Four mistakes are worth fixing.

1. Splitting the past marker from the verb. Learners often assume the past marker goes on the negative word. Actually, the verb carries the past, so 갔안어요 and 갔어요 안 are wrong. Write 안 갔어요.
2. Mixing up 안 and 않. The long form uses the verb 않다, written with ㅎ, so 가지 안았어요 is a spelling error. Write 가지 않았어요. The short word 안 is spelled without ㅎ and stands alone before the verb.
3. Using the present with a past time word. 어제 학교에 안 가요 mixes yesterday with the present. Use 어제 학교에 안 갔어요.
4. Using 못 for "I didn't want to." 못 claims that something blocked you. If you just chose not to, say 안 갔어요.

A quick check: find the time word, check that the verb is in the past form, and check that nothing sits inside the verb. Practice makes the check automatic.

Practice and Answers

Try these four items before you read the answers.

1. Choose the form. "I didn't watch the movie (I chose not to)." Complete: 영화를 ___ . (안 봤어요 / 못 봤어요)
2. Fix the error. A learner writes 가지 안았어요 for "did not go." Correct it.
3. Translate. "I couldn't sleep last night." Use 못 and 잤어요.
4. Write your own. Write one sentence with 아직 안 + a past verb, and one sentence with 이/가 아니었어요 about something you were not.

Answer key

1. 안 봤어요. You chose not to watch it, so 안 is correct. The full sentence is 영화를 안 봤어요. (yeonghwareul an bwasseoyo.)
2. 가지 않았어요. The helper verb 않다 is spelled with ㅎ.
3. 어젯밤에 못 잤어요. (eojetbame mot jasseoyo.) The past form 잤어요 comes right after 못.
4. Answers vary. Examples: 아직 안 먹었어요 (I haven't eaten yet), and 저는 작년에 학생이 아니었어요 (I wasn't a student last year). Check that the verb carries the past marker and that nothing splits the verb.

If your answers match, the pattern is secure. The next lessons extend it.

Next Lessons after the Negative past Tense in Korean

After the negative past tense in Korean, learn how to answer questions that contain a negative, then the vocabulary of negative words. This lesson covers the polite short and long forms. It does not cover the future negative or the negative in other speech levels in depth.

1. Continue with negative questions in Korean, the next lesson in the set.
2. Review the previous lesson, negating 하다 verbs 공부 안 해요.
3. Revisit the short forms in 안 negation in Korean and 못 can't in Korean.
4. Read the long form in -지 않다 negation.
5. Return to Korean negation for the full list.

Practise by describing yesterday in four negative sentences. When 안 갔어요 and 못 봤어요 come out on their own, the negative past is part of your speech.

Frequently Asked Questions

Does the past marker go on 안 or on the verb?

The past marker always goes on the verb. 안 and 못 never change: 안 갔어요 is correct, and forms such as 갔안어요 are wrong. The word before the verb stays fixed, and the verb carries the past ending -았/었-. The same is true for the future and for polite endings, so you only inflect the verb.

How do I say "I haven't eaten yet" in Korean?

Say 아직 안 먹었어요. The word 아직 means "still" or "yet", and the negative past 안 먹었어요 expresses that the action has not happened so far. Korean uses the past form for this meaning, so there is no separate "present perfect" form like the English "have not".

What is the difference between 안 갔어요 and 가지 않았어요?

They mean the same thing, "did not go". 안 갔어요 is the short form, used in speech and messages. 가지 않았어요 is the long form, used in writing, news, essays and careful speech. Both are correct. The long form uses the helper verb 않다 (not), which is spelled with ㅎ, unlike 안.

How do I make the negative past of 이다 (to be)?

Use 이/가 아니었어요, the past of 아니다. For example, 학생이 아니었어요 means "I wasn't a student". Do not put 안 before 이었어요. The word 아니다 already means "to not be", so the past is built from it: 아니 + 었어요 = 아니었어요.

Can I use 못 with every past verb?

You can use 못 with action verbs, such as 못 갔어요 (couldn't go) and 못 먹었어요 (couldn't eat). You cannot use it with adjectives, as in 못 추웠어요, because 못 needs an action that was blocked. For adjectives, 안 + past is the only short form.