目錄
The Korean pattern 「-아/어지다」 turns adjectives into verbs and is a core construction for expressing “a gradual change of state.” In Chinese, it roughly corresponds to “變得…” (“become…”). The weather gets hotter, a road gets wider, your mood improves—these processes in which “it was not originally this way, but later became this way” are expressed in Korean almost entirely through this pattern. Many Korean learners memorize a long list of adjectives, yet still cannot react quickly when they hear 「예뻐졌어요」 or 「좋아졌어요」 in a drama. The problem is not vocabulary. It is that they have not understood how the word class and overall nuance change once an adjective is combined with 「-아/어지다」. This article explains the attachment rules, tense changes, the boundary between this pattern and passive constructions with verbs, and the points learners most commonly confuse.
Why do Korean learners need to understand 「-아/어지다」?
When learners encounter the Korean pattern 「-아/어지다」, it is probably one of the first times many of them feel that static vocabulary has come to life. This core pattern expresses “a gradual change of state,” and although its Chinese equivalent is usually “變得…” (“become…”), Korean adjectives themselves can only describe a fixed snapshot of the current state. If you want to express a time-based process of change, such as the weather getting hotter, a road getting wider, or your mood getting better, an adjective by itself is simply not enough. This is where the pattern is needed to add a dynamic timeline to the sentence.
Anyone who watches Korean dramas should already be somewhat familiar with this construction. Whenever the relationship between characters takes a turn, lines such as 「우리 사이가 어색해졌어」 (“Things between us have become awkward”) and 「날씨가 추워졌어」 (“The weather has gotten cold”) often appear. Without 「-아/어지다」, you could only say the static 「어색해」 or 「추워」, and the sense that “the situation is moving in a certain direction” would disappear.
Attachment rules for 「-아/어지다」: the vowel in the adjective stem determines everything
「-아/어지다」 attaches only after adjectives, and the form it takes is determined by the vowel in the final syllable of the adjective stem. There are three cases: if the stem vowel is ㅏ or ㅗ, use 「-아지다」; for other vowels, use 「-어지다」; and if the stem ends in 「하다」, it becomes 「해지다」. The basic procedure is to remove 「다」 from the dictionary form, then attach the appropriate form according to the vowel in the remaining stem.
| Attachment target | Stem vowel | Attachment pattern | Example |
| Adjective | ㅏ／ㅗ | stem＋아지다 | 작다 → 작아지다 (become smaller) |
| Adjective | other than ㅏ／ㅗ | stem＋어지다 | 넓다 → 넓어지다 (become wider) |
| Adjective | ending in 하다 | stem＋해지다 | 따뜻하다 → 따뜻해지다 (become warm) |
The most easily overlooked group here is 「하다」 adjectives. Korean has a large number of adjectives built in the form “Sino-Korean word＋하다,” such as 건강하다 (healthy), 행복하다 (happy), and 깨끗하다 (clean). All of them follow the 「해지다」 pattern, becoming 건강해지다, 행복해지다, and 깨끗해지다. As soon as you see an adjective ending in 「하다」, the attachment pattern is fixed, so there is no need to check the preceding vowel.
- Example: 요즘 운동을 시작해서 몸이 건강해졌어요.
Romanization: yo-jeum un-dong-eul si-jak-hae-seo mom-i geon-gang-hae-jyeo-sseo-yo
Translation: I recently started exercising, and my body has become healthier.
「건강하다」 is an adjective ending in 「하다」. After taking 「해지다」, it expresses a change from an unhealthy state to a healthy one. The second half of the sentence uses the past tense 「-았/었-」 to describe a change that has already occurred.
Tense changes with 「-아/어지다」: how do you express the present, past, and future?
「-아/어지다」 itself is a verb, so its tense changes follow exactly the same rules as ordinary verbs. The most common forms are the present 「-아/어져요」, the past 「-아/어졌어요」, and the future/predictive 「-아/어질 거예요」. Because the stem vowel of 「지다」 is ㅣ, its conjugation always follows the 「어」 pattern. As a result, regardless of whether the preceding form is 아, 어, or 해, the tense portion consistently ends up as 「져요／졌어요／질」.
In actual use, the past tense 「-아/어졌어요」 appears most often because a “change” is commonly described as a “transition that has already been completed.” When you say something “got better” or “got colder,” you are usually looking back at a change that has already happened. The present 「-아/어져요」 is used instead for changes that are currently in progress or changes that occur repeatedly, such as a process that continues to worsen or steadily improve.
Usage ① of 「-아/어지다」｜Expressing a change of state with positive vowels
When the vowel in the final syllable of an adjective stem is 「ㅏ」 or 「ㅗ」—commonly referred to as positive vowels—「-아지達」 must be attached to express a change of state. In actual writing and speech, if the final stem syllable has no final consonant, the vowel 「ㅏ」 will usually contract or merge with the 「아」 in 「-아지다」.
- Example: 약을 먹은 후에 기분이 훨씬 좋아졌어요.
Romanization: ya-geul meo-geun hu-e gi-bun-i hwol-ssin jo-a-jyeo-sseo-yo
Translation: I felt much better after taking the medicine.
The stem vowel of 「좋다」 is the positive vowel 「ㅗ」, so according to the rule it takes 「-아지다」 and becomes 좋아지다. Here, it is further combined with the past tense 「-았/었-」 to become 「좋아졌어요」, describing the objective fact that the change had already been completed after taking the medicine. Adding the adverb 「훨씬 (much, considerably)」 also emphasizes the degree of the change. - Example: 길이 전보다 훨씬 넓아졌어요.
Romanization: gil-i jeon-bo-da hwol-ssin neol-ba-jyeo-sseo-yo
Translation: The road has become much wider than before.
The stem vowel of 「넓다 (wide)」 is 「ㅓ」 outside the positive-vowel category, and this case should belong to the negative-vowel system. However, if we use a pure positive-vowel example such as 「작다 (small)」, its stem contains the positive vowel 「ㅏ」, so after attaching 「-아지다」 the past form becomes 「작아졌어요 (became smaller)」. This is used to emphasize a clear contrast in which space or volume has decreased. - Example: 아침에는 맑았는데 오후가 되면서 하늘이 흐려졌어요.
Romanization: a-chim-e-neun mal-gat-neun-de o-hu-ga doe-myeon-seo ha-neul-i heu-ryeo-jyeo-sseo-yo
Translation: It was clear in the morning, but as afternoon came, the sky became overcast.
「맑다 (clear, bright)」 itself contains the positive vowel 「ㅏ」, so when expressing an improvement in the weather, 「맑아지다」 is used. In this sentence, however, another adjective with a negative vowel, 「흐리다 (cloudy, blurry)」, is used to describe the contrasting process of the sky turning cloudy. Combined with the past tense, it ends as 「흐려졌어요」, highlighting a short-term change in the weather.
Usage ② of 「-아/어지다」｜Expressing a change of state with negative vowels
When the vowel in the final syllable of an adjective stem is anything other than 「ㅏ」 or 「ㅗ」—commonly called negative vowels, such as ㅓ, ㅜ, ㅡ, ㅣ, ㅐ, and ㅔ—「-어지다」 must always be attached to express a change of state from the past toward the present.
- Example: 날씨가 점점 더워져요.
Romanization: nal-ssi-ga jeom-jeom deo-wo-jyeo-yo
Translation: The weather is gradually getting hotter.
「덥다 (hot)」 is a typical ㅂ-irregular adjective. When the final consonant ㅂ in the stem meets a vowel-initial ending, it first changes to the vowel 「우」. Because 「우」 belongs to the negative-vowel system, it then combines with 「-어지다」 and contracts to 「더워지다」. Here, the present tense is used together with the adverb 「점漸 (gradually)」 to accurately convey a continuing process of change. - Example: 꾸준히 연습하면 발음이 자연스러워질 거예요.
Romanization: kku-jun-hi yeon-seup-ha-myeon ba-reum-i ja-yeon-seu-reo-wo-jil geo-ye-yo
Translation: If you keep practicing consistently, your pronunciation will become natural.
「자연스럽다 (natural)」 is also a ㅂ-irregular adjective. The final ㅂ in the stem changes to 우 before a vowel, and after being treated as part of the negative-vowel system, it combines with 「-어지다」 and contracts to 「자연스러워지다」. The sentence ends with the future/predictive form 「-ㄹ 거예요」, which is often paired with the conditional connective ending 「-(으)면」 to predict a future course of change. - Example: 방을 청소한 후에 공기가 맑아졌어요.
Romanization: bang-eul cheong-so-han hu-e gong-gi-ga mal-ga-jyeo-sseo-yo
Translation: After cleaning the room, the air became fresher.
The stem vowel of 「맑다 (clear, fresh)」 is 「ㅏ」, so it should essentially be classified as a positive vowel and take 「-아지다」 to become 「맑아지다」. However, if we look at the logic of standard negative-vowel forms such as 「멀다 (far)」 becoming 「멀어지다」 or 「넓다 (wide)」 becoming 「넓어지다」, the resulting verb after attachment will in every case follow the stem characteristics of 「지다」. This sentence uses the past form 「졌어요」 after the conversion to emphasize the contrast in the air quality before and after the room was cleaned.
Usage ③ of 「-아/어지다」｜Expressing a change of state with forms ending in 하다
Korean contains many adjectives formed as “Sino-Korean word＋하다” or simply ending in 「하다」. When these adjectives express a change of state, their attachment rule is completely fixed. There is no need to determine the vowel type of the preceding syllable; 「하다」 simply changes to 「해지다」.
- Example: 요즘 운동을 시작해서 몸이 건강해졌어요.
Romanization: yo-jeum un-dong-eul si-jak-hae-seo mom-i geon-gang-hae-jyeo-sseo-yo
Translation: I recently started exercising, and my body has become healthier.
「건강하다」 is a standard adjective ending in 「하다」, so the transformation rule applies directly and changes it to 「건강해지다」, highlighting the transition from being unhealthy to being healthy now. The second half of the sentence also combines with the past-tense ending 「-어졌어요」, showing that this change has already taken place in everyday life. - Example: 요즘 아침저녁으로 날씨가 쌀쌀해졌어요.
Romanization: yo-jeum a-chim-jeo-nyeo-geu-ro nal-ssi-ga ssal-ssal-hae-jyeo-sseo-yo
Translation: Recently, the weather has become chilly in the mornings and evenings.
「쌀쌀하다 (chilly)」 is an adjective ending in 「하다」, so it follows the transformation rule and becomes 「쌀쌀해지다」. Seasonal shifts and temperature fluctuations are among the most common everyday contexts for this pattern. By stating it in the past form 「쌀쌀해졌어요」, the speaker can clearly convey that the climate has noticeably shifted compared with before. - Example: 서로 오해를 풀고 나니 관계가 다시 편안해졌어요.
Romanization: seo-ro o-hae-reul pul-go na-ni gwan-gye-ga da-si pyeon-an-hae-jyeo-sseo-yo
Translation: After we cleared up the misunderstanding with each other, the relationship became comfortable and relaxed again.
「편안하다 (便安, comfortable and at ease)」 is an adjective describing a psychological state and ending in 「하다」, so according to the rule it directly becomes 「편안해지다」. The second half uses the past form 「편안해졌어요」 to tell the listener that the previously tense atmosphere returned to a comfortable state, both psychologically and in terms of interpersonal interaction, after the misunderstanding was resolved.
Adjectival 「-아/어지다」 vs passive 「-아/어지다」 with verbs: two faces of the same 「지다」
Even though the form is the same 「-아/어지다」, when it follows an adjective it expresses a “change of state,” while after a verb it expresses the “passive.” This is one of the points beginners most commonly confuse. The key is whether the word before it is an adjective or a verb: adjective＋지다 means “become a certain way,” while verb＋지다 means “be done／naturally get done.” The same 「지다」 performs completely different functions depending on the word class that precedes it.
| Comparison point | Adjective＋아/어지다 | Verb＋아/어지다 |
| Preceding word class | Adjective | Verb |
| Core function | Change of state (become…) | Passive (be…, naturally…) |
| Chinese equivalent | become fat, become better, become clean | be written, be closed, break |
| Typical examples | 좋아지다、예뻐지다 | 써지다、깨지다、닫아지다 |
| Common mistake | ❌ Mistakenly using it with verbs as a change-of-state form | ❌ Mistaking the passive for a change of state |
▌Adjective usage: expressing a change of state
❌ Imprecise: interpreting 컵을 깨요 as a change
（깨다 is the verb “to break,” and is not itself a change-of-state adjective）
✅ Correct: 실력이 좋아졌어요
In this sentence, 좋다 is an adjective. By adding 「-아/어지다」, it expresses a change in ability from poor to good. This is the core of the adjectival usage.
▌Verb usage: expressing the passive
❌ Misunderstanding: interpreting 컵이 깨졌어요 as the adjectival change “the cup became broken”
✅ Correct understanding: 컵이 깨졌어요 means “the cup broke／was broken” in the passive
Here, 깨다 is a verb. Adding 「-어지다」 expresses the passive or a naturally occurring result rather than the gradual change of state found with adjectives. Both may be translated with the Chinese word “變,” but their grammatical identities are different.
Learn Korean through dramas: how 「-아/어지다」 is actually used in Korean drama dialogue
「-아/어지다」 is a high-frequency pattern in emotional scenes in Korean dramas because drama is fundamentally about “changes in relationships and states of mind.” Characters go from strangers to being close, from dislike to affection, and from indifference to caring about someone. When these turning points are expressed in Korean, this pattern is involved almost every time. Understanding it is like getting a key to following emotional shifts in Korean dramas. Native Korean speakers also use it extensively in everyday conversation. When talking about physical condition, weather, mood, or changes in appearance, 「-아/어지다」 appears very frequently.
▌Situation ①｜Meeting again after a long time and complimenting someone on becoming prettier
A：와, 오랜만이에요! 진짜 예뻐졌어요.
wa, o-raen-ma-ni-e-yo! jin-jja ye-ppeo-jyeo-sseo-yo
Wow, it’s been a long time! You’ve really gotten prettier.
B：그래요? 살이 좀 빠져서 그런가 봐요.
geu-rae-yo? sa-ri jom ppa-jyeo-seo geu-reon-ga bwa-yo
Really? Maybe it’s because I lost a little weight.
📌 Grammar Point: The stem vowel of 예쁘다 is ㅕ, so it takes 「어지다」 and becomes 예뻐지다. This is one of the most natural ways to compliment someone on a change in appearance. Compared with simply saying 예뻐요, it adds the sense of “you have become prettier than before.”
▌Situation ②｜Talking about the weather turning chilly
A：요즘 아침저녁으로 쌀쌀해졌어요.
yo-jeum a-chim-jeo-nyeo-geu-ro ssal-ssal-hae-jyeo-sseo-yo
It has gotten chilly in the mornings and evenings lately.
B：맞아요. 감기 조심하세요.
ma-ja-yo. gam-gi jo-sim-ha-se-yo
That’s right. Take care not to catch a cold.
📌 Grammar Point: 쌀쌀하다 (chilly) is a 「하다」 adjective, so it follows the 「해지다」 pattern and becomes 쌀쌀해졌어요. Changes in weather are one of the most typical everyday contexts in which this pattern is used.
How does Korean 「-아/어지다」 compare with Japanese 「〜くなる／〜になる」?
The change of state expressed by Korean 「-아/어지다」 is mainly represented in Japanese by two forms, 「〜くなる」 and 「〜になる」. The difference depends on whether the preceding word is an い-adjective or a な-adjective/noun.
◆ Similar grammar: 〜くなる／〜になる
With Japanese い-adjectives, remove the final 「い」 and add 「くなる」. な-adjectives and nouns take 「になる」. Both mean “become…,” and conceptually they overlap closely with Korean 「-아/어지다」.
- Example: 寒くなりました。
Kana: さむくなりました
Translation: It became cold.
The い-adjective 寒い drops い and takes くなる. This corresponds to Korean 추워졌어요, and both describe a change in the state of the weather. - Example: 元気になりました。
Kana: げんきになりました
Translation: I became energetic／recovered.
The な-adjective 元気 takes になる, corresponding to Korean 건강해졌어요. The logic of the pattern is almost parallel to the way Korean 「하다」 adjectives take 「해지다」.
◆ Core difference from 「-아/어지다」:
Korean does not divide adjectives into different types for this purpose. It consistently uses 「-아/어지다」 and determines the exact form only from the stem vowel. Japanese, by contrast, first requires you to identify whether the adjective is an い-adjective or a な-adjective, and then choose between 「くなる」 and 「になる」. The Korean decision point is the “vowel,” while the Japanese decision point is the “type of adjective.” This is the main difference to watch for when the two languages express “change.”
Understanding how the change-of-state pattern 「-아/어지다」 attaches is not just about learning how to turn an adjective into a verb. It is more like gaining a key to understanding the flow of emotions and shifts in mindset in Korean dramas. Once you develop the reflex of looking at an adjective, identifying its vowel, choosing the correct attachment, and then adding the frequently used past tense, you will be able to respond much more naturally when you hear expressions about changes in appearance, weather, or mood in conversations or while chatting with Korean friends.
FAQs
It expresses a change in the state described by an adjective over time and corresponds to “become…” in English. It turns an adjective that originally describes a fixed state into a verb capable of expressing a dynamic process of change. For example, 좋다 (good) becomes 좋아지다 (become better). It is commonly used for changes in weather, mood, appearance, and physical condition.
Look at the vowel in the final syllable of the adjective stem. If the vowel is ㅏ or ㅗ, use 「-아지다」. Other vowels take 「-어지다」, while adjectives ending in 「하다」 become 「해지다」. The decision is based on the vowel, not intuition. For example, 작다 (ㅏ) → 작아지다, while 넓다 (ㅓ) → 넓어지다.
The most common problem is failing to distinguish adjectival usage from verbal usage. Adjective＋「-아/어지다」 expresses a change of state, while verb＋「-아/어지다」 expresses the passive. Both may be translated with the Chinese word “變,” but they have different grammatical identities. Another common mistake is forgetting that 「하다」 adjectives take 「해지다」 rather than 「하아지다」.
It conjugates like an ordinary verb. The present is 「-아/어져요」, the past is 「-아/어졌어요」, and the future or predictive form is 「-아/어질 거예요」. Because the vowel in 「지다」 is ㅣ, the tense portion consistently appears as 「져요／졌어요／질」. The past tense is the most common because changes are often described as transitions that have already been completed.
Korean consistently uses 「-아/어지다」 and determines the attachment form from the stem vowel. Japanese first distinguishes between い-adjectives and な-adjectives, then chooses either 「くなる」 or 「になる」. The key decision in Korean is the vowel, while in Japanese it is the adjective type. This is the main difference in how the two languages express change.