Vocab: The Change of Seasons

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TL;DR 🦄

Learn how to talk about 환절기 (the change of seasons) and weather that's 쌀쌀하다 (chilly).

Describe a sky or landscape as 푸르다 (blue/green).

Use 서서히 (gradually) and 변하다 (to change) to describe slow transformations.

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🎧 Iru Helper Note

Need a refresher on pronunciation? Check out the Korean Helper Widgets for audio support.

Try listening to: 환절기에는 감기에 걸리기 쉬워요.

🌈 The Big Picture

The 환절기 (change of seasons) brings shifting weather — mornings and evenings can suddenly feel 쌀쌀하다 (chilly), and the sky might turn a deep 푸르다 (blue/green). These shifts happen 서서히 (gradually), as the world slowly 변하다 (changes) from one season to the next. This lesson covers the essential vocabulary for describing the change of seasons.

🎨 The Core Change of Seasons Family

1. 환절기 — change of seasons / seasonal transition 🍂

Refers to the transitional period when the weather shifts between seasons. "환절기에는 건강 조심하세요" means "Take care of your health during the change of seasons."

Note: Compare with 계절, which refers to the season itself (spring, summer, fall, winter), not the transition.

2. 쌀쌀하다 — to be chilly 🌬️

Describes mildly cold weather, often in early autumn or spring. "아침저녁으로 쌀쌀해요" means "It's chilly in the mornings and evenings."

Note: Compare with 춥다, which describes more intense cold (like winter weather).

3. 푸르다 — to be blue / green (often nature) 🌿

Describes a vivid blue or green color, often used poetically for the sky, sea, or plants. "하늘이 푸르러요" means "The sky is blue."

Note: Irregular adjective (러-irregular) — 푸르다 → 푸르러요 (NOT 풀러요, unlike 르-irregular verbs like 모르다 → 몰라요). Compare with 파랗다, the more standard word for "blue."

4. 서서히 — gradually / slowly 🐢

Describes a slow, gradual process. "서서히 변하고 있어요" means "It's gradually changing."

Note: Compare with 갑자기 (suddenly), which describes abrupt change — the opposite of 서서히.

5. 변하다 — to change / transform 🔄

Describes a transformation, often gradual or internal. "날씨가 변했어요" means "The weather has changed."

Note: Compare with 바뀌다, which often describes external replacement or switching (e.g., schedules, items).

🛠️ How They Work in a Sentence

1. 환절기에는 감기에 걸리기 쉬워요.

During the change of seasons, it's easy to catch a cold.

→ 환절기에는 (during the change of seasons) + 감기에 걸리기 쉬워요 (it's easy to catch a cold).

2. 아침저녁으로 쌀쌀해졌어요.

It has become chilly in the mornings and evenings.

→ 아침저녁으로 (in the mornings and evenings) + 쌀쌀해졌어요 (it became chilly).

3. 하늘이 점점 푸르게 변했어요. 계절이 서서히 변하고 있어요.

The sky gradually turned blue. The season is gradually changing.

→ 하늘이 점점 (the sky, gradually) + 푸르게 변했어요 (changed to blue). 계절이 (the season) + 서서히 변하고 있어요 (is gradually changing).

🧩 General Formation Rule

환절기 (noun) → combines with particles directly: 환절기에, 환절기는, 환절기가

쌀쌀하다 (adjective) → 쌀쌀해요 (polite present), 쌀쌀한 (modifier), 쌀쌀해지다 (to become chilly)

푸르다 (러-irregular adjective) → 푸르러요 (polite present — irregular, NOT 풀러요), 푸른 (modifier), 푸르렀어요 (past)

서서히 (adverb) → used directly before verbs, no conjugation needed

변하다 (verb) → 변해요 (polite present), 변했어요 (past), 변하는 (modifier), 변하고 있다 (is changing)

📚 Cross-check note

All vocabulary cross-checked against korean.go.kr ✅

🪞 Synonym Alert

환절기 vs 계절 — 환절기 is the transitional period between seasons; 계절 is the season itself.

쌀쌀하다 vs 춥다 — 쌀쌀하다 describes mild chilliness (early autumn/spring); 춥다 describes more intense cold (winter).

푸르다 vs 파랗다 — 푸르다 is often used poetically for nature and can mean blue or green; 파랗다 is the more standard, specific word for "blue."

서서히 vs 갑자기 — 서서히 means gradually; 갑자기 means suddenly — they're opposites.

변하다 vs 바뀌다 — 변하다 often describes gradual or internal transformation; 바뀌다 often describes external replacement or switching.

⚠️ Pitfalls to Dodge

❌ 쌀쌀해요 used for harsh winter cold → ✅ 쌀쌀하다 describes mild chilliness; use 춥다 for intense cold.

❌ 푸르다 conjugated as 풀러요 → ✅ 푸르다 is 러-irregular: 푸르러요 (not 풀러요 like 모르다 → 몰라요).

❌ 환절기 used to mean "a season" → ✅ 환절기 = the transition between seasons; 계절 = the season itself.

❌ 서서히 used for sudden events → ✅ 서서히 means gradually; use 갑자기 for sudden change.

❌ 변하다 and 바뀌다 used interchangeably in all contexts → ✅ 변하다 = gradual/internal change; 바뀌다 = external replacement/switching.

환절기에는 건강 챙기면서, 서서히 변하는 계절을 느껴보세요! 🍂🌬️

Try this exercise

Fill in each blank with the correct word from the Vocabulary Box. Use each word at least once.

＿＿＿＿에는 감기에 걸리기 쉬워요.

아침저녁으로 ＿＿＿＿해졌어요.

하늘이 점점 ＿＿＿＿게 ＿＿＿＿했어요.

계절이 ＿＿＿＿＿＿＿＿하고 있어요.

＿＿＿＿에는 건강에 신경 써야 해요.

오늘 바람이 ＿＿＿＿해요.

가을 하늘이 정말 ＿＿＿＿러요.

날씨가 ＿＿＿＿ 추워지고 있어요.

그 사람의 마음이 ＿＿＿＿했어요.

＿＿＿＿이 되면 옷차림이 달라져요.

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Vocabulary Box

환절기 · 쌀쌀하다 · 푸르다 · 서서히 · 변하다

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Pitfalls Reminder

쌀쌀하다 (mild chill) vs 춥다 (intense cold)

푸르다 → 푸르러요 (러-irregular, not 풀러요)

환절기 (transition) vs 계절 (the season itself)

서서히 (gradually) vs 갑자기 (suddenly)

변하다 (gradual change) vs 바뀌다 (replacement/switching)

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Want more reps? Visit the Practice Hub below for 50 more questions! 🚀

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Practice Hub: The Change of Seasons 🍂

Ready for more practice? Work through these 5 exercises (50 questions total) to fully master this lesson's vocabulary. Listen along with the Korean Helper Widgets for pronunciation support!

Exercise 1 — Change of Seasons Word Recall 🍂

A. What does 환절기 mean?

B. What does 쌀쌀하다 mean?

C. What does 푸르다 mean?

D. What does 서서히 mean?

E. What does 변하다 mean?

F. What is the difference between 환절기 and 계절?

G. What is the difference between 쌀쌀하다 and 춥다?

H. What is the difference between 푸르다 and 파랗다?

I. What is the difference between 서서히 and 갑자기?

J. How does 푸르다 conjugate in polite present tense?

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Reference

환절기 = change of seasons/seasonal transition

쌀쌀하다 = chilly

푸르다 = blue/green (often nature)

서서히 = gradually/slowly

변하다 = to change/transform

환절기 = transition between seasons; 계절 = the season itself

쌀쌀하다 = mild chill; 춥다 = intense cold

푸르다 = poetic blue/green for nature; 파랗다 = standard "blue"

서서히 = gradually; 갑자기 = suddenly (opposite)

푸르러요 (러-irregular)

Exercise 2 — Change of Seasons Situational Phrases 🗣️

A. How do you say "It's easy to catch a cold during the change of seasons"?

B. How do you say "It has become chilly in the mornings and evenings"?

C. How do you say "The sky gradually turned blue"?

D. How do you say "The season is gradually changing"?

E. How do you say "You need to take care of your health during the seasonal transition"?

F. How do you say "The wind is chilly today"?

G. How do you say "The autumn sky is really blue"?

H. How do you say "The weather is gradually getting colder"?

I. How do you say "His heart changed"?

J. How do you say "When the seasons change, clothing styles change too"?

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Reference

환절기에는 감기에 걸리기 쉬워요.

아침저녁으로 쌀쌀해졌어요.

하늘이 점점 푸르게 변했어요.

계절이 서서히 변하고 있어요.

환절기에는 건강에 신경 써야 해요.

오늘 바람이 쌀쌀해요.

가을 하늘이 정말 푸르러요.

날씨가 서서히 추워지고 있어요.

그 사람의 마음이 변했어요.

환절기가 되면 옷차림이 달라져요.

Exercise 3 — 푸르다 & 변하다 Conjugation Practice 🔁

A. Conjugate 푸르다 into polite present tense.

B. Conjugate 푸르다 into modifier (attributive) form.

C. Conjugate 변하다 into polite present tense.

D. Conjugate 변하다 into past tense.

E. Fill in: 가을 하늘이 ＿＿＿＿. (푸르다, polite present)

F. Fill in: 도시가 많이 ＿＿＿＿. (변하다, past)

G. Translate: "The sea looks blue."

H. Translate: "Things have changed a lot since then."

I. Fill in: ＿＿＿＿ 바다를 보러 갔어요. (푸르다, modifier)

J. Translate: "The leaves are gradually changing color."

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Reference

푸르러요

푸른

변해요

변했어요

가을 하늘이 푸르러요.

도시가 많이 변했어요.

바다가 푸르게 보여요.

그 후로 많이 변했어요.

푸른 바다를 보러 갔어요.

나뭇잎이 서서히 색이 변하고 있어요.

Exercise 4 — 쌀쌀하다 & 서서히 Practice 🌬️

A. Conjugate 쌀쌀하다 into polite present tense.

B. Conjugate 쌀쌀하다 into "becomes" form (-아/어지다).

C. Translate: "It's chilly outside today."

D. Fill in: 오늘 밖이 ＿＿＿＿해요.

E. Translate: "The weather is gradually getting chilly."

F. Fill in: 날씨가 ＿＿＿＿＿＿＿＿지고 있어요.

G. Translate: "I felt a chilly wind in the morning."

H. Fill in: 아침에 ＿＿＿＿ 바람을 느꼈어요.

I. Translate: "The temperature is gradually dropping."

J. Fill in: 기온이 ＿＿＿＿ 떨어지고 있어요.

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Reference

쌀쌀해요

쌀쌀해지다

오늘 밖이 쌀쌀해요.

쌀쌀

날씨가 서서히 쌀쌀해지고 있어요.

서서히 / 쌀쌀해

아침에 쌀쌀한 바람을 느꼈어요.

쌀쌀한

기온이 서서히 떨어지고 있어요.

서서히

Exercise 5 — 종합 연습 (Mixed Mastery) 🎯

A. Translate: "During the change of seasons, the weather gradually becomes chilly."

B. Fill in: ＿＿＿＿에는 날씨가 ＿＿＿＿＿＿＿＿해져요.

C. Translate: "The sky gradually changed from blue to gray during the seasonal transition."

D. Fill in: ＿＿＿＿에 하늘이 ＿＿＿＿＿＿＿＿에서 회색으로 ＿＿＿＿했어요.

E. Translate: "It's chilly during the change of seasons, so the blue sky gradually turns gray."

F. Fill in: ＿＿＿＿에는 ＿＿＿＿해서 ＿＿＿＿ 하늘이 ＿＿＿＿ 회색으로 ＿＿＿＿해요.

G. Translate: "As the season gradually changes, the mornings become chilly and the sky turns a deep blue."

H. Fill in: 계절이 ＿＿＿＿＿＿＿＿면서 아침이 ＿＿＿＿해지고 하늘은 짙은 ＿＿＿＿(으)로 ＿＿＿＿해요.

I. Translate: "During the change of seasons, everything changes gradually — the weather, the sky, even our clothes."

J. Write one full sentence using at least three of this lesson's words.

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Reference

환절기에는 날씨가 서서히 쌀쌀해져요.

환절기 / 서서히 / 쌀쌀

환절기에 하늘이 서서히 푸른색에서 회색으로 변했어요.

환절기 / 서서히 / 푸른 / 변

환절기에는 쌀쌀해서 푸른 하늘이 서서히 회색으로 변해요.

환절기 / 쌀쌀 / 푸른 / 서서히 / 변

계절이 서서히 변하면서 아침이 쌀쌀해지고 하늘은 짙은 푸른색으로 변해요.

서서히 / 변하 / 쌀쌀 / 푸른 / 변

환절기에는 날씨, 하늘, 옷차림까지 모든 게 서서히 변해요.

Example: 환절기가 되면 날씨가 서서히 쌀쌀해지고 하늘도 푸르게 변해요.

환절기를 맞아 서서히 변해가는 하늘과 날씨를 느껴 보세요! 🍂🌌