How to Conjugate 춥다 (to be cold): ㅂ-irregular Pattern

ㅂ irregular: ㅂ changes to 우 before a vowel ending. 춥 → 추우 + 어요 → 추워요.

The Rule

ㅂ irregular: ㅂ changes to 우 before a vowel ending. 춥 → 추우 + 어요 → 추워요. 춥다 follows the ㅂ-irregular irregular pattern. This means the verb stem changes when certain endings are added. Don't worry — once you learn this pattern, it applies to many other verbs too.

Why English Speakers Get It Wrong

English verb conjugation is relatively simple — "I eat, he eats, I ate." Korean is more complex because the verb ending changes based on politeness level, tense, AND the verb stem's final vowel or consonant. The ㅂ-irregular pattern is especially tricky because the stem itself changes. English irregular verbs (go→went) change unpredictably, but Korean irregular verbs follow learnable PATTERNS. Once you know the ㅂ-irregular rule, you can predict how all ㅂ-irregular verbs behave.

How It Works

Stem: 춥 Polite present (해요체): 추워요 Polite past: 추웠어요 Polite future: 추울 거예요 Formal (합쇼체): 춥습니다 Negative: 안 추워요 Notice how the stem "춥" changes in some forms. This is the ㅂ-irregular pattern in action.

Real Examples

• 추워요 (chuwoyo) — "be cold (polite present)" • 추웠어요 (chuwoteoyo) — "be cold (past)" • 추울 거예요 (chuur geoyeyo) — "will be cold (future)" • 춥습니다 (chupseupnida) — "be cold (formal)" • 안 추워요 (an chuwoyo) — "don't be cold"

Common Mistakes

❌ 춥어요 (chupeoyo) ✅ 추워요 (chuwoyo) → ㅂ doesn't stay — it transforms to 우. This is the #1 mistake English speakers make with ㅂ irregulars. ❌ Using the casual form (춥어/아) in formal situations ✅ Use 춥습니다 when speaking to elders, at work, or in official settings → Mixing up politeness levels is one of the most noticeable mistakes foreigners make in Korean.

Quick Tip

Start by mastering the 해요체 (polite) form: 추워요. This is the form you'll use 90% of the time in daily life. Once it's automatic, add the past (추웠어요) and future (추울 거예요) to your toolkit. For ㅂ-irregular verbs, make a list of 5 common ones and practice all their forms. The pattern will click after repetition.

춥다: 추워요 (present) / 추웠어요 (past) / 추울 거예요 (future)

Examples

추워요 — chuwoyo — be cold (polite)

추웠어요 — chuwoteoyo — be cold (past)

추울 거예요 — chuur geoyeyo — will be cold

춥습니다 — chupseupnida — be cold (formal)

안 추워요 — an chuwoyo — don't be cold