#28. How to Make Negative Sentences in Korean (안 vs 못)
When you start speaking Korean in real daily situations, one of the most confusing moments is when you need to say “I don’t” or “I can’t.” Korean has two small but very important words for this: 안 and 못. They look similar, but in real conversations, Koreans use them in completely different emotional and practical contexts.
Understanding this difference will instantly make your Korean sound more natural and also prevent awkward misunderstandings.
1. When Koreans Use “안” in Real Life
안 is used when you choose NOT to do something.
It is about intention, preference, or decision.
In real conversations, Koreans usually say “안 + verb” when they simply don’t feel like doing something or decide not to do it.
It is not about ability. It is about choice.
Real Situation Example
A: 오늘 같이 영화 볼래요?
(Do you want to watch a movie today?)
B: 아니요, 오늘은 영화 안 볼래요.
(No, I don’t want to watch a movie today.)
A: 왜요?
(Why?)
B: 그냥 집에서 쉬고 싶어요.
(I just want to rest at home.)
👉 Here, “안 볼래요” shows a personal choice, not a limitation.
Step Insight
Ask yourself: “Am I choosing not to do it?” If yes, use 안.
2. When Koreans Use “못” in Real Life
못 is used when you are unable to do something.
It is about situation, ability, or external limitation.
In real conversations, Koreans often use “못” when something prevents them from doing an action, even if they want to do it.
Real Situation Example
A: 오늘 같이 영화 볼래요?
(Do you want to watch a movie today?)
B: 아니요, 오늘은 영화 못 봐요.
(No, I can’t watch a movie today.)
A: 왜요?
(Why?)
B: 야근이 있어서 시간이 없어요.
(I have overtime work, so I don’t have time.)
👉 Here, “못 봐요” shows a real limitation, not a choice.
Step Insight
Ask yourself: “Is something blocking me from doing it?” If yes, use 못.
3. Simple Difference Summary
| Word | Meaning | Core Idea |
|---|---|---|
| 안 | don’t | personal choice |
| 못 | can’t | situation or ability |
4. Real Usage Tip (Natural Korean Insight)
In real conversations, Koreans are very sensitive to context. Saying “안 했어요” can sometimes sound like you simply didn’t bother, while “못 했어요” sounds more understandable and softer.
For example, at work or school, people often prefer “못 했어요” to avoid sounding careless.
However, in casual situations with friends, both are used freely depending on intention.
5. Common Mistakes Learners Make
Many beginners use 안 for everything because it feels easier. But this often changes the meaning completely.
❌ 오늘 수업 안 갔어요 (I chose not to go)
→ This can sound like skipping on purpose.
✅ 오늘 수업 못 갔어요 (I couldn’t go)
→ This sounds like there was a reason.
Always check the situation first, not the grammar first.
6. Cultural Insight
In Korean culture, explaining “why you couldn’t do something” is often more important than simply saying “I didn’t do it.”
This is why “못” is very commonly used in polite explanations. It reduces blame and makes communication smoother.
For example, in workplaces, saying “못 했습니다” is often considered more polite than “안 했습니다,” because it implies there was a reason outside your control.
Pro Tip
A simple rule to remember:
안 = I don’t (choice)
못 = I can’t (situation)
If you are unsure, think about control. If you control it → 안. If you don’t → 못.
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