Korean Irregular ㅂ Verbs: Hot, Cold, and Spicy (ㅂ 불규칙)
Grammar Rule in 30 Seconds
When a verb stem ends in ㅂ, drop the ㅂ and add 우 or 워 when adding vowel-starting endings.
- If the stem ends in ㅂ, remove it: 춥다 (cold) -> 춥-
- Add 우: 춥- -> 추우-
- Add the ending: 추우 + 어요 = 추워요 (It is cold).
Overview
The Korean ㅂ irregular (ㅂ 불규칙; _b-bulgyuchik_) is a crucial phonological phenomenon affecting a specific subset of verbs and adjectives. This irregularity occurs when a verb or adjective stem ending in the consonant ㅂ (p/b) is immediately followed by a vowel-initial grammatical ending. In such cases, the ㅂ does not conjugate in the standard way; instead, it undergoes a transformation, typically changing into 우 (_u_) or, in a few specific instances, 오 (_o_).
This change is a form of phonetic assimilation, making pronunciation smoother and more natural in spoken Korean. Understanding this rule is essential for achieving native-like fluency, as these irregular verbs and adjectives are highly common in everyday conversation, especially when describing states, feelings, and sensory perceptions.
Historically, the ㅂ irregular pattern stems from an older form of Korean where these words ended in a different sound (a labial fricative, similar to an 'f' or 'v' sound) which later evolved. When followed by a vowel, this sound would vocalize, leading to the ㅜ or ㅗ sound we observe today. This is not an arbitrary rule but a vestige of historical phonological shifts, making it a systematic, albeit irregular, part of the language.
While the standard conjugation rules are foundational, the ㅂ irregular pattern highlights how Korean phonology prioritizes ease of pronunciation, often leading to systematic alterations of stem-final consonants before vowels. Mastering this pattern allows you to conjugate a significant portion of descriptive vocabulary correctly.
Conjugation Table
| Grammar Form | 춥다 (to be cold) |
맵다 (to be spicy) |
아름답다 (to be beautiful) |
돕다 (to help) |
곱다 (to be pretty/elegant) |
||
|---|---|---|---|---|---|---|---|
| :------------------------ | :------------------ | :------------------- | :-------------------------- | :--------------- | :----------------------------- | ||
| Dictionary Form | 춥다 (_chupda_) |
맵다 (_maepda_) |
아름답다 (_areumdapda_) |
돕다 (_dopda_) |
곱다 (_gopda_) |
||
| Stem | 춥 (_chup_) |
맵 (_maep_) |
아름답 (_areumdap_) |
돕 (_dop_) |
곱 (_gop_) |
||
Polite Present (-아요/어요) |
추워요 (_chuwoyo_) |
매워요 (_maewoyo_) |
아름다워요 (_areumdawoyo_) |
도와요 (_dowayo_) |
고와요 (_gowa-yo_) |
||
Formal Present (-습니다/ㅂ니다) |
춥습니다 (_chupseumnida_) |
맵습니다 (_maepseumnida_) |
아름답습니다 (_areumdapseumnida_) |
돕습니다 (_dopseumnida_) |
곱습니다 (_gopseumnida_) |
||
Polite Past (-았어요/었어요) |
추웠어요 (_chuwosseoyo_) |
매웠어요 (_maewosseoyo_) |
아름다웠어요 (_areumdawosseoyo_) |
도왔어요 (_dowasseoyo_) |
고왔어요 (_gowasseoyo_) |
||
Formal Past (-았습니다/었습니다) |
춥었습니다 (_chup-eosseumnida_) |
맵었습니다 (_maep-eosseumnida_) |
아름다웠습니다 (_areumdawosseumnida_) |
도왔습니다 (_dowasseumnida_) |
고왔습니다 (_gowasseumnida_) |
||
Polite Future (-을 거예요) |
추울 거예요 (_chuul geoyeyo_) |
매울 거예요 (_maeul geoyeyo_) |
아름다울 거예요 (_areumdaul geoyeyo_) |
도울 거예요 (_doule geoyeyo_) |
고울 거예요 (_goul geoyeyo_) |
||
Connective (-아서/어서) |
추워서 (_chuwo-seo_) |
매워서 (_maewoseo_) |
아름다워서 (_areumdawoseo_) |
도와서 (_dowaseo_) |
고와서 (_gowaseo_) |
||
Adjective Form (-(으)ㄴ) |
추운 (_chu-un_) |
매운 (_maeun_) |
아름다운 (_areumdaun_) |
도운 (_do-un_) |
고운 (_go-un_) |
||
Propositional (-(으)ㅂ시다) |
춥읍시다 (_chupeupsida_) |
맵읍시다 (_mae-eupsida_) |
아름답읍시다 (_areumdabeupsida_) |
돕읍시다 (_dopeupsida_) |
곱읍시다 (_gopeupsida_) |
How This Grammar Works
ㅂ irregular conjugation is fundamentally a process of vocalization and assimilation. When a verb or adjective stem ending in ㅂ encounters a vowel-initial ending, the ㅂ consonant, being a labial stop, becomes highly susceptible to influence from the following vowel. This is a common phonetic phenomenon across languages, where adjacent sounds modify each other for smoother articulation.ㅂ to transform into a rounded vowel or semi-vowel, primarily ㅜ or, in limited cases, ㅗ.ㅂ. This is the core linguistic principle at play: vowel harmony. While traditional vowel harmony rules are less strict in modern Korean, its remnants are clearly seen here.ㅂ irregulars, the ㅂ changes to ㅜ (_u_). This ㅜ then combines with the vowel of the subsequent ending (e.g., -아/어), typically resulting in a 워 (_wo_) sound for -어요 endings or 와 (_wa_) for the 돕다/곱다 exceptions. For example, 덥다 (_deopda_, to be hot) becomes 더우 + -어요 → 더워요 (_deowoyo_).ㅂ disappears and is replaced by ㅜ, which then merges with the -어 ending to form 워.ㅂ is ㅗ or ㅏ. Only two common verbs, 돕다 (_dopda_, to help) and 곱다 (_gopda_, to be pretty/elegant), fall into this category. For these two words, the ㅂ transforms into 오 (_o_) instead of 우.오 then combines with the subsequent -아 ending to form 와 (_wa_). For instance, 돕다 + -아요 → 도오 + -아요 → 도와요 (_dowayo_). This divergence is a historical artifact, preserving an older form of vowel harmony or assimilation, where the ㅗ sound of the stem influences the transformed ㅂ to also be a rounded ㅗ.ㅂ-final stem. 2.ㅂ.ㅜ (default) or ㅗ (for 돕다, 곱다). 5.Formation Pattern
ㅂ irregular verbs and adjectives follows a precise, step-by-step process. Adhering to these steps ensures correct conjugation every time you encounter such a word.
다 (_da_). The remaining part is the stem. For example, from 춥다 (_chupda_, to be cold), the stem is 춥 (_chup_). From 아름답다 (_areumdapda_, to be beautiful), the stem is 아름답 (_areumdap_).
-습니다/-ㅂ니다, -고, -지만, -으면): The ㅂ irregular rule does not apply. The ㅂ remains unchanged, and you attach the ending as usual. For example, 춥다 + -습니다 → 춥습니다 (_chupseumnida_). 맵다 + -고 → 맵고 (_maepgo_).
-아요/-어요, -았어요/-었어요, -(으)러, -(으)면, -(으)ㄴ (adjective modifier)): The ㅂ irregular rule applies. Proceed to the next step.
ㅂ: Remove the ㅂ from the end of the stem. For example, 춥 becomes 추. 아름답 becomes 아름다. 돕 becomes 도.
ㅜ or ㅗ: This is the crucial step. The choice between ㅜ and ㅗ depends on the vowel immediately preceding the ㅂ in the original stem.
ㅜ: For almost all ㅂ irregular verbs and adjectives, if the vowel before the dropped ㅂ is anything other than ㅏ or ㅗ, you insert ㅜ (_u_). Examples: 춥 → 추우, 맵 → 매우, 어렵 → 어려우.
ㅗ: This applies exclusively to stems where the vowel immediately preceding the ㅂ is ㅗ or ㅏ. The two primary examples are 돕다 (_dopda_, to help) and 곱다 (_gopda_, to be pretty/elegant). For these, you insert ㅗ (_o_) instead of ㅜ. Examples: 돕 → 도오, 곱 → 고오.
ㅜ or ㅗ with the initial vowel of your chosen ending.
ㅜ and the ending is -아요/-어요, it will merge: 우 + -어 → 워 (_wo_). Example: 매우 + -어요 → 매워요 (_maewoyo_).
ㅗ and the ending is -아요/-어요 (specifically -아요 due to vowel harmony with ㅗ), it will merge: 오 + -아 → 와 (_wa_). Example: 도오 + -아요 → 도와요 (_dowayo_).
-(으)면 or -(으)러, the inserted ㅜ or ㅗ directly precedes the ending. Example: 추우 + -(으)면 → 추우면 (_chu-umyeon_). 아름다우 + -(으)ㄴ → 아름다운 (_areumdaun_).
아름답다 (_areumdapda_, to be beautiful) to the polite present tense (-아요/어요).
아름답 (_areumdap_)
-아요/어요), so apply the rule.
ㅂ: 아름다
ㅂ was ㅏ. This is not ㅗ or ㅏ, but 아 followed by ㅂ. The rule is that if the stem's final syllable vowel is ㅏ or ㅗ, then ㅗ is inserted. In 아름답, the vowel preceding ㅂ is ㅏ. However, the common rule is that if the last vowel in the stem (before the final consonant) is ㅏ or ㅗ, then ㅗ is used. For 아름답다, the ㅏ is not in the final syllable. So, ㅜ is the default. Thus, insert ㅜ: 아름다우
-어요 (since 우 is a dark vowel): 아름다우 + -어요 → 아름다워요 (_areumdawoyo_).
돕다 (_dopda_, to help) with -아요/어요).
돕 (_dop_)
-아요/어요), so apply the rule.
ㅂ: 도
ㅂ was ㅗ. This triggers the ㅗ insertion. So, insert ㅗ: 도오
-아요 (since 오 is a light vowel): 도오 + -아요 → 도와요 (_dowayo_).
When To Use It
ㅂ irregular verbs and adjectives when describing states, conditions, sensory perceptions, or emotions. These words constitute a significant portion of descriptive vocabulary, making their correct conjugation vital for expressing feelings, opinions, and observations in Korean. Think of any scenario where you're articulating how something is or how something feels.- Describing Weather: Many common weather-related adjectives are
ㅂirregular. When discussing the temperature, precipitation, or overall atmospheric conditions, you will frequently encounter this pattern. 날씨가 추워요(_nalssiga chuwoyo_).
Conjugation Table (ㅂ-Irregular)
| Dictionary | Stem | Polite (-어요) | Formal (-습니다) |
|---|---|---|---|
|
춥다
|
춥-
|
추워요
|
춥습니다
|
|
덥다
|
덥-
|
더워요
|
덥습니다
|
|
맵다
|
맵-
|
매워요
|
맵습니다
|
|
어렵다
|
어렵-
|
어려워요
|
어렵습니다
|
|
쉽다
|
쉽-
|
쉬워요
|
쉽습니다
|
|
돕다
|
돕-
|
도와요
|
돕습니다
|
Meanings
This rule describes a specific group of Korean adjectives and verbs where the final consonant 'ㅂ' changes to '우' before vowel-initial suffixes.
Adjective Modification
Used to describe states like hot, cold, or spicy.
“물이 뜨거워요.”
“김치가 매워요.”
Verb Conjugation
Used for actions like helping (돕다) or walking (걷다 - though 걷다 is a different irregular).
“제가 도와줄게요.”
“어려운 문제를 풀어요.”
Reference Table
| Form | Structure | Example |
|---|---|---|
|
Affirmative
|
Stem + 우 + 어요
|
추워요
|
|
Negative
|
Stem + 우 + 지 않아요
|
춥지 않아요
|
|
Question
|
Stem + 우 + 어요?
|
추워요?
|
|
Past
|
Stem + 우 + 었어요
|
추웠어요
|
|
Future
|
Stem + ㅂ + 을 거예요
|
추울 거예요
|
|
Modifier
|
Stem + 우 + ㄴ
|
매운 김치
|
Formality Spectrum
춥습니다. (Weather)
추워요. (Weather)
추워. (Weather)
개추워. (Weather)
The ㅂ-Irregular Transformation
Weather
- 춥다 cold
- 덥다 hot
Taste
- 맵다 spicy
Difficulty
- 어렵다 difficult
- 쉽다 easy
Examples by Level
날씨가 추워요.
The weather is cold.
김치가 매워요.
Kimchi is spicy.
오늘 너무 더워요.
It is too hot today.
이게 어려워요.
This is difficult.
어제는 정말 추웠어요.
It was really cold yesterday.
매운 음식을 좋아해요?
Do you like spicy food?
도와주세요!
Please help me!
가벼운 가방을 샀어요.
I bought a light bag.
문제가 어려우니까 천천히 하세요.
Since the problem is difficult, take your time.
더우면 에어컨을 켜세요.
If it's hot, turn on the AC.
그분은 참 고마운 분이에요.
That person is a very thankful (helpful) person.
도와줄 수 있어요?
Can you help me?
그는 어려운 상황에서도 웃음을 잃지 않았습니다.
He did not lose his smile even in a difficult situation.
날씨가 더워질수록 시원한 음료가 생각나요.
The hotter it gets, the more I think of cold drinks.
도와주셔서 정말 감사합니다.
Thank you so much for helping me.
이 문제는 해결하기가 너무 어려워요.
This problem is too difficult to solve.
매운맛의 강도는 개인마다 다르게 느껴질 수 있습니다.
The intensity of spiciness can be felt differently by each person.
어려움에 처했을 때 친구의 도움이 컸습니다.
When I was in difficulty, my friend's help was significant.
더위가 기승을 부리는 여름입니다.
It is a summer where the heat is rampant.
도와달라는 말 한마디가 쉽지 않았습니다.
Saying the words 'please help' was not easy.
그의 고마운 마음은 말로 다 표현할 수 없습니다.
His thankful heart cannot be fully expressed in words.
어려운 고비를 넘기고 나니 한결 마음이 편해졌습니다.
After overcoming the difficult hurdle, my heart felt much more at ease.
더운 기운이 가시지 않는 밤입니다.
It is a night where the heat does not dissipate.
도와주지 않으면 일을 끝낼 수 없습니다.
If you don't help, I cannot finish the work.
Easily Confused
Learners think all ㅂ verbs are irregular.
Learners use '우' for 돕다.
Learners use the -어요 form for modifiers.
Common Mistakes
춥어요
추워요
잡아요 (as irregular)
잡아요
도우요
도와요
매브요
매워요
춥지 않아요
춥지 않아요
어렵어요
어려워요
더우어요
더워요
도와주세요 (as 돕다)
도와주세요
고마우요
고마워요
무겁어요
무거워요
춥는
추운
매우는
매운
도우는
돕는
Sentence Patterns
오늘 날씨가 ___.
이 음식은 ___.
한국어 공부가 ___.
저를 ___.
Real World Usage
오늘 날씨 추워ㅠㅠ
이 음식은 매워요.
어려운 과제도 잘 해결합니다.
도와주세요!
오늘 너무 더워!
이거 너무 어려워요.
Memorize the list
Check for regular verbs
Use flashcards
Listen to K-Pop
Smart Tips
Check if it's on the irregular list.
Remember it's an exception (오).
Use -ㄴ for irregulars.
Focus on the 'w' sound.
Pronunciation
ㅂ to 우
The ㅂ sound is replaced by a soft 'w' sound.
Statement
추워요 ↓
Falling intonation for facts.
Question
추워요? ↑
Rising intonation for questions.
Memorize It
Mnemonic
Think of the 'B' (ㅂ) as a balloon that pops and turns into a 'U' (우) when it gets too hot or cold.
Visual Association
Imagine a spicy pepper (맵다) that is so hot it pops its 'B' skin and turns into a 'U' shape.
Rhyme
When the B is in the way, drop it out and let U play!
Story
It was a cold (춥다) day. I tried to eat spicy (맵다) food. It was difficult (어렵다) to eat, but my friend helped (돕다) me.
Word Web
Challenge
Write 5 sentences using these words in the polite -어요 form in 5 minutes.
Cultural Notes
Koreans are obsessed with weather and food, so these words are used constantly.
You will hear '도와주세요' (Help me!) in almost every dramatic scene.
Describing food as '매워요' is a common way to bond over meals.
The ㅂ-irregular stems from ancient Korean sound shifts where the bilabial stop weakened.
Conversation Starters
오늘 날씨가 어때요?
이 음식이 매워요?
한국어 공부가 어려워요?
도와줄 수 있어요?
Journal Prompts
Common Mistakes
Test Yourself
날씨가 ___ (춥다).
김치가 ___.
Find and fix the mistake:
잡어요 (Correct it).
Arrange the words in the correct order:
All words placed
Click words above to build the sentence
It is hot.
Answer starts with: 더워요...
Match each item on the left with its pair on the right:
어렵다 + 공부
돕다 + -어요
Score: /8
Practice Exercises
8 exercises날씨가 ___ (춥다).
김치가 ___.
Find and fix the mistake:
잡어요 (Correct it).
도와주세요 / 저를 / 제발
It is hot.
춥다 - ?
어렵다 + 공부
돕다 + -어요
Score: /8
Practice Bank
5 exercises선물 정말 ___.
매워요 / 이 / 진짜 / 음식 / .
Identify the regular verb:
Please help me.
Match the pairs
Score: /5
FAQ (8)
It is a phonological shift to make pronunciation easier.
No, only some. Check the dictionary.
It is an exception and uses '오'.
Memorize the common ones like 춥다, 덥다, 맵다.
Yes, it applies to all vowel-starting endings.
Yes, but the conjugation might look different.
Yes, it is standard Korean.
People will understand, but it will sound unnatural.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Stem-changing verbs
Spanish changes based on person, Korean changes based on the following vowel.
Liaison
Liaison is about pronunciation, not spelling changes.
Strong verbs
German changes are historical, Korean changes are productive.
I-adjectives
Japanese does not have this specific consonant-to-vowel shift.
Weak verbs
Arabic roots are triconsonantal, Korean is agglutinative.
None
Chinese does not change verb forms at all.
Learning Path
Prerequisites
Learn These First
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