안 vs -지 않다: Differences, Rules and Examples

What you'll learn

• Choose 안 or -지 않다 for a given situation and explain the choice in one sentence.
• Form both versions of the same sentence, including the tense.
• Use the particles 도 and 는 inside the long form.
• Avoid the 좋다 and 좋아하다 trap.
• Fix the most common mistake: using the short form with a long predicate.

Before you start: you should know both forms on their own. If not, read 안 negation in Korean and -지 않다 negation first. Audio plays only when you press a button.

What Is the Difference in 안 vs -지 않다?

The difference in 안 vs -지 않다 is style, not meaning. 안 goes before the predicate and sounds natural in speech. -지 않다 attaches 지 to the stem and then adds 않다. It sounds more careful and is common in writing, in speeches and with long predicates. Both say "do not" or "is not."

Two sentences built on the same verb show the contrast:

• 안 먹어요. (an meogeoyo.) [안 머거요] = "I do not eat." The negative word comes before the verb.
• 먹지 않습니다. (meokji anseumnida.) [먹찌 안씀니다] = "I do not eat." The verb stem comes first, and the formal ending sits on 않다.

The verb 먹다 is the same in both. Only the shape of the negative changes. The next sections turn this into a rule you can apply in a few seconds.

The One-Line Rule

Use 안 when you talk, and use -지 않다 when you write or speak formally. Ask yourself one question before you speak: "Would I say this to a friend, or would I put it in a report?" A friend gets 안. A report gets -지 않다. If you cannot tell which applies, 안 is the safer choice in conversation, and -지 않다 is the safer choice on paper.

Side-by-Side Comparison of 안 and -지 않다

The table compares 안 and -지 않다 on the points learners need most. Each row has one specific answer for each form.

The table shows that the two forms share a meaning but differ in shape, in the slot for tense and in the options they allow. Next, one sentence is built in both forms to show how the choice is made.

How Does 안 vs -지 않다 Work with a Worked Example?

안 vs -지 않다 works by building the same negative twice. Follow the steps below with the sentence "I drink coffee."

1. Start with the positive sentence. 저는 커피를 마셔요. (jeoneun keopireul masyeoyo.) = "I drink coffee." The verb is 마셔요, from 마시다.
2. Build the short form. Put 안 directly before the verb: 저는 커피를 안 마셔요. (jeoneun keopireul an masyeoyo.) = "I do not drink coffee."
3. Build the long form. Take the stem 마시, add 지, and add 않아요: 저는 커피를 마시지 않아요. (jeoneun keopireul masiji anayo.) [저는 커피를 마시지 아나요] = "I do not drink coffee."
4. Check the meaning. Both sentences say the same thing. The first sounds like everyday speech, and the second sounds more careful.
5. Move to a higher register if needed. For a talk or a letter, write 마시지 않습니다 (masiji anseumnida.) [마시지 안씀니다]. For an essay or a news-style text, write 마시지 않는다.

You will know it worked when the positive sentence and both negatives share the same subject and object and differ only in the verb part. The most common slip at this step is putting 안 after the stem as if it were a suffix, as in 마시안 해요. The short word always comes before the whole predicate.

Here is the same method with the tense. The past of 안 마셔요 is 안 마셨어요, with the tense on the verb. The past of 마시지 않아요 is 마시지 않았어요, with the tense on 않다. The skill is the same, and only the slot for the tense changes. A practical question follows: which one should you pick in each situation?

How Do the Two Forms Compare across Tenses and Speech Levels?

The two forms match in every tense and speech level, but the tense marker sits in a different place. In the short form it stays on the verb. In the long form it moves to 않다. The table lines up both forms for the verb 먹다.

Every short form in the table is grammatical, but the plain written row shows a style gap. 안 먹는다 is grammatical but less common in formal writing, where 먹지 않는다 is the usual choice. This gap explains why writers lean on the long form. The tense table also shows that the long form is the one with a fixed first part, 먹지, which makes it easy to extend with particles and endings.

Which Should You Choose in Each Situation?

Choose 안 for talk and -지 않다 for formal or written Korean. The table below sorts everyday situations. Each row names the situation, the best form and a model sentence.

When you are unsure, the register ladder helps: casual talk uses 안, polite talk uses either, formal talk uses -지 않다, and written Korean uses -지 않다 in plain style. This ladder is a tendency, not a law. Many polite speakers use -지 않다 in daily talk, and many writers use 안 in informal blogs.

Choosing between the two is mostly about style, so the mistakes below come from mixing up style and shape.

What Mistakes Do Learners Make?

Learners most often use the short form where the long form is smoother, or mix the two shapes. Five mistakes appear again and again, and each has a quick repair.

1. Using the short form with a long predicate. Learners often assume that 안 can go before anything. Actually, with a 하다 verb followed by an extra ending, 안 cannot simply go in front, and the long form reads best. Write 공부하고 싶지 않아요 (or the short 공부 안 하고 싶어요), not 안 공부하고 싶어요. The last version puts 안 in front of a whole 하다 verb, which sounds clumsy.
2. Stacking both forms. Write 안 먹어요 or 먹지 않아요, not 안 먹지 않아요. That stacked version is a double negative ("it is not that I do not eat"), so it says the opposite of what you meant.
3. Putting the tense on the wrong word. Write 먹지 않았어요, not 먹었지 않아요. In the long form the tense goes on 않다.
4. Splitting 하다 verbs wrongly. Write 공부 안 해요 for the short form, not 안 공부해요. The long form keeps the verb whole: 공부하지 않아요.
5. Writing 안아요 for 않아요. The helper verb is spelled 않. The short word is spelled 안. They sound alike, but they are not the same word.

Use this checklist when a negative sentence feels wrong: Is there only one negative? Is the tense on the last word? Is the register right? Edge cases follow from the same checklist.

When Do 안 and -지 않다 Behave Differently?

안 and -지 않다 behave differently in four cases: particles, 좋다 and 좋아하다, long chains and emphasis. Each case below gives the rule and one example.

• Particles inside the long form. 먹지도 않아요. (meokjido anayo.) [먹찌도 아나요] = "I do not even eat it." 먹지는 않아요. (meokjineun anayo.) [먹찌는 아나요] = "I do not eat it (though I may do something else with it)." The short form has no slot for 도 or 는.
• 좋다 versus 좋아하다. 안 좋아요 (an joayo.) [안 조아요] = "It is not good." 좋아하지 않아요 (joahaji anayo.) [조아하지 아나요] = "I do not like it." 안 좋아해요 (an joahaeyo.) [안 조아해요] = "I do not like it." Do not swap 안 좋아요 and 좋아하지 않아요, because they have different meanings. The long form of 안 좋아요 is 좋지 않아요 ("is not good").
• Long chains. With patterns such as -고 싶다, the long form is smoother: 가고 싶지 않아요. The short form 안 가고 싶어요 is also correct and common, with a slightly different focus: "I want not to go."
• Emphasis. In speech, 안 can be stressed to carry feeling: "안 먹어!" The long form carries emphasis through particles, not stress.

An honest limit: this lesson covers the two negatives with action verbs and adjectives. It does not cover 못 and -지 못하다, which say "cannot," and it does not cover commands, which need -지 마세요. The long forms for "cannot" appear in -지 못하다 cannot. The shared rule is simple: the long form gives you more room, and the short form gives you more speed.

Practice and Answers

Try the four items before you read the answer key. Cover the answers with your hand.

1. Choose the form. You are writing a short formal talk. Complete: 저는 이 계획에 동의하___ 않습니다. (지 / 고)
2. Fix the error. 저는 안 먹지 않아요. Rewrite it in the long form.
3. Translate. "I do not want to study." Use the long form.
4. Write your own. Write one sentence in the short form and the same sentence in the long form, using any verb you know. Say the English meaning.

Answer key

1. 지. The long form is stem + 지 + 않습니다, so the sentence is 저는 이 계획에 동의하지 않습니다 and means "I do not agree with this plan."
2. 저는 먹지 않아요. The 안 is removed, because the long form already contains the negative.
3. 공부하고 싶지 않아요. (gongbuhago sipji anayo.) [공부하고 십찌 아나요] The long form follows the whole pattern -고 싶다.
4. Answers vary. Check that the two sentences have the same meaning and that the second uses stem + 지 + 않다. An example: 저는 영화를 안 봐요 and 저는 영화를 보지 않아요 (I do not watch movies).

Check your understanding with one more rule of thumb: if the sentence is talk, use 안. If it is writing or formal speech, use -지 않다.

Next Lessons after 안 vs -지 않다

After 안 vs -지 않다, study the "cannot" forms, then the wider negation set. This lesson compares two forms of "do not" but does not teach every use of either. The detailed rules live on their own pages.

1. Start with -지 못하다 cannot, the long form of "cannot."
2. Review the short form in 안 negation in Korean and the long form in -지 않다 negation.
3. Return to Korean negation to see every lesson in the set, or compare other pairs on korean grammar differences.

With these steps, the choice in 안 vs -지 않다 becomes automatic: decide whether you talk or write, then choose the short or the long negative.

Frequently Asked Questions

Do 안 and -지 않다 ever mean different things?

Almost never in plain sentences: 안 가요 and 가지 않아요 both mean "I do not go." The meanings split only through the verb. 안 좋아요 means "it is not good," while 좋아하지 않아요 means "I do not like it," because 좋다 and 좋아하다 are different words.

Which one should I use in conversation?

Use 안. It is shorter, natural in speech, and the default for friends, classmates and shop staff. Switch to -지 않다 in a speech, a formal talk, an essay or a news-style text. In conversation, -지 않다 is correct but can sound careful or stiff.

Can I put 도 or 는 inside the long form?

Yes, and this is a real advantage of the long form. You can write 먹지도 않아요 ("I do not even eat it") and 먹지는 않아요 ("I do not eat it, but ..."). The short form 안 has no slot for these particles, so use -지 않다 when you need them.

Is 안 공부해요 wrong?

It is not standard for 하다 verbs. The normal short form splits the verb: 공부 안 해요. The long form keeps the verb whole: 공부하지 않아요. People say 안 공부해요 in casual speech, but beginners should learn 공부 안 해요 and 공부하지 않아요 first.

Does the tense go in the same place?

No. In the short form the tense stays on the verb: 안 먹었어요. In the long form the tense moves to 않다: 먹지 않았어요. Write 먹었지 않아요 and the sentence is wrong. Remember the rule as: the last word of the sentence carries the tense.