When learning Korean, you will often need to express inability or lack of capability. The two most common ways to do this are 못 V-아/어요 and V-지 못해요. These structures both mean “cannot” or “unable to,” but they are used slightly differently. In this guide, we will explain their structure, meaning, and usage with plenty of examples to help you understand and use them naturally in conversations.
Contents
1. Definition
못 V-아/어요 and V-지 못해요 both indicate that someone is unable to perform an action. These grammatical structures correspond to the English words:
- Unable
- Cannot
- Incapable
These expressions show inability due to:
- Personal limitations
- External circumstances
- Restrictions
Key English equivalents include:
- “I cannot do it”
- “I am unable to…”
- “I am not capable of…”
The primary difference between 못 V-아/어요 and V-지 못해요 is subtle, with 못 V-아/어요 being more conversational and V-지 못해요 being slightly more formal.
2. Form (Structure)
- 못 V-아/어요
- 못 is placed before the verb to indicate inability.
- Example: 먹다 (to eat) → 못 먹어요 (cannot eat)
- V-지 못해요
- The verb stem is followed by -지 못해요.
- Example: 먹다 (to eat) → 먹지 못해요 (cannot eat)
Structure Table
| Pattern | Example Verb | Conjugation |
| 못 + V-아/어요 | 가다 (to go) 먹다 (to eat) | 못 가요 (cannot go) 못 먹어요 (cannot eat) |
| V-지 못해요 | 가다 (to go) 먹다 (to eat) | 가지 못해요 (cannot go) 먹지 못해요 (cannot eat) |
3. Meaning & Usage
Both 못 V-아/어요 and V-지 못해요 mean “cannot” or “unable to,” but they can have slightly different connotations.
- 못 V-아/어요 is more commonly used in spoken Korean and is more natural in daily conversations.
- V-지 못해요 sounds slightly more formal or neutral, making it suitable for written language.
- Both can be used interchangeably in most situations.
4. Examples
- 저는 수영을 못 해요. (I can’t swim.)
- 오늘 시간이 없어서 영화를 못 봐요. (I can’t watch a movie today because I don’t have time.)
- 저는 매운 음식을 못 먹어요. (I can’t eat spicy food.)
- 비가 많이 와서 밖에 나가지 못해요. (It’s raining a lot, so I can’t go outside.)
- 어제 늦게 자서 오늘 일찍 일어나지 못했어요. (I slept late yesterday, so I couldn’t wake up early today.)
- 자동차가 고장 나서 여행을 가지 못해요. (The car is broken, so I can’t go on the trip.)
- 일이 너무 많아서 휴식을 취하지 못하고 있어요. (I have too much work, so I can’t take a break.)
- 중요한 시험이 있어서 친구를 만나지 못했어요. (I had an important exam, so I couldn’t meet my friend.)
- 건강이 안 좋아서 운동을 하지 못했어요. (I wasn’t feeling well, so I couldn’t exercise.)
- 갑자기 정전이 돼서 컴퓨터를 사용하지 못했어요. (There was a sudden blackout, so I couldn’t use my computer.)
- 돈이 없어서 새 옷을 사지 못해요. (I don’t have money, so I can’t buy new clothes.)
- 한국어를 잘 못 해서 의사소통하지 못해요. (I’m not good at Korean, so I can’t communicate well.)
- 눈이 많이 와서 차를 운전하지 못해요. (It’s snowing heavily, so I can’t drive the car.)
- 티켓이 매진돼서 콘서트에 가지 못했어요. (The tickets were sold out, so I couldn’t go to the concert.)
- 비행기가 연착돼서 제 시간에 도착하지 못했어요. (The flight was delayed, so I couldn’t arrive on time.)
- 알레르기가 있어서 고양이를 키우지 못해요. (I have allergies, so I can’t keep a cat.)
- 키가 작아서 농구 팀에 들어가지 못했어요. (I’m short, so I couldn’t join the basketball team.)
- 비자가 거절돼서 유학을 가지 못했어요. (My visa was rejected, so I couldn’t study abroad.)
- 소음이 너무 심해서 집중하지 못해요. (The noise is too loud, so I can’t concentrate.)
- 약속을 잊어버려서 친구를 만나지 못했어요. (I forgot about the appointment, so I couldn’t meet my friend.)
5. Key Points to Remember
- Two Forms:
- 못 V-아/어요
- V-지 못해요
- Meaning: Both express inability or lack of capability to perform an action.
- Usage Difference:
- 못 V-아/어요: More common in spoken Korean, casual conversations.
- V-지 못해요: Slightly more formal, suitable for written Korean.
- Interchangeability: In most situations, these forms can be used interchangeably.
- Placement:
- 못: Always placed before the verb.
- 지 못해요: Always follows the verb stem.
- Tenses:
- Both forms can be used in present, past, and future tenses.
- Adjust the ending accordingly (e.g., 못 했어요, 하지 못했어요 for past tense).
- Negation Focus:
- These forms focus on inability rather than unwillingness.
- For unwillingness, use 안 instead of 못.
- Common Verbs:
- Practice with frequently used verbs like 가다 (go), 먹다 (eat), 하다 (do).
- Practice with frequently used verbs like 가다 (go), 먹다 (eat), 하다 (do).
- Context Matters:
- The choice between the two forms can depend on the specific verb and context.
- The choice between the two forms can depend on the specific verb and context.
- Politeness Levels:
- Both forms can be adjusted for different politeness levels (e.g., 못 가요 vs. 못 갑니다).
- Both forms can be adjusted for different politeness levels (e.g., 못 가요 vs. 못 갑니다).
6. Practice Exercises
- 저는 수영을 _______. (I can’t swim.)
- 오늘 시간이 없어서 영화를 _______. (I can’t watch a movie today because I don’t have time.)
- 저는 매운 음식을 _______. (I can’t eat spicy food.)
- 비가 많이 와서 밖에 _______. (It’s raining a lot, so I can’t go outside.)
- 어제 늦게 자서 오늘 일찍 _______. (I slept late yesterday, so I couldn’t wake up early today.)
- 자동차가 고장 나서 여행을 _______. (The car is broken, so I can’t go on the trip.)
- 일이 너무 많아서 휴식을 _______. (I have too much work, so I can’t take a break.)
- 중요한 시험이 있어서 친구를 _______. (I had an important exam, so I couldn’t meet my friend.)
- 건강이 안 좋아서 운동을 _______. (I wasn’t feeling well, so I couldn’t exercise.)
- 갑자기 정전이 돼서 컴퓨터를 _______. (There was a sudden blackout, so I couldn’t use my computer.)
7. Answers
- 못 해요 / 하지 못해요
- 못 봐요 / 보지 못해요
- 못 먹어요 / 먹지 못해요
- 나가지 못해요 / 못 나가요
- 일어나지 못했어요 / 못 일어났어요
- 가지 못해요 / 못 가요
- 취하지 못하고 있어요 / 못 취하고 있어요
- 만나지 못했어요 / 못 만났어요
- 하지 못했어요 / 못 했어요
- 사용하지 못했어요 / 못 사용했어요
8. Common Mistakes and Tips
- Incorrect word order
Incorrect ❌: 저는 가요 못 학교에.
Correct ✅: 저는 학교에 못 가요.
Tip: Always place 못 directly before the verb. - Mixing up 안 and 못
Incorrect ❌: 저는 술을 안 마셔요. (When you mean you’re unable to drink)
Correct ✅: 저는 술을 못 마셔요.
Tip: Use 못 for inability and 안 for unwillingness or choice. - Incorrect verb form with 지 못하다
Incorrect ❌: 저는 한국어를 말할지 못해요.
Correct ✅: 저는 한국어를 말하지 못해요.
Tip: Use the verb stem (말하다) before 지 못하다, not the future tense form. - Using the wrong tense
Incorrect ❌: 어제 친구를 만나지 못해요. (When talking about the past)
Correct ✅: 어제 친구를 만나지 못했어요.
Tip: Adjust the tense of 못하다 according to the time context. - Incorrect use with descriptive verbs
Incorrect ❌: 저는 키가 못 커요.
Correct ✅: 저는 키가 크지 않아요.
Tip: Use 지 않다 with descriptive verbs instead of 못.
못 V-아/어요 and V-지 못해요 are essential grammar structures for expressing inability in Korean. While they are mostly interchangeable, 못 V-아/어요 is more commonly used in speech, while V-지 못해요 is slightly more formal. By practicing these patterns, you will be able to express yourself more naturally in Korean.
To further enhance your ability to express capability and inability in Korean, it’s recommended to study the grammar pattern ‘V-(으)ㄹ 수 있다/없다’ alongside these structures. This pattern allows you to express “can/cannot” or “able/unable to” in a more nuanced way, complementing your understanding of 못 V-아/어요 and V-지 못해요.