How to Conjugate 푸르다 (to be blue/green): 르-irregular Pattern

르 irregular but different from most: 르 doesn't undergo the standard change. 푸르 + 어요 → 푸르러요 (ㄹ inserts differently).

The Rule

르 irregular but different from most: 르 doesn't undergo the standard change. 푸르 + 어요 → 푸르러요 (ㄹ inserts differently). 푸르다 follows the 르-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 르-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 르-irregular rule, you can predict how all 르-irregular verbs behave.

How It Works

Stem: 푸르 Polite present (해요체): 푸르러요 Polite past: 푸르렀어요 Polite future: 푸르를 거예요 Formal (합쇼체): 푸르릅니다 Negative: 안 푸르러요 Notice how the stem "푸르" changes in some forms. This is the 르-irregular pattern in action.

Real Examples

• 푸르러요 (pureureoyo) — "be blue/green (polite present)" • 푸르렀어요 (pureureoteoyo) — "be blue/green (past)" • 푸르를 거예요 (pureureur geoyeyo) — "will be blue/green (future)" • 푸르릅니다 (pureureupnida) — "be blue/green (formal)" • 안 푸르러요 (an pureureoyo) — "don't be blue/green"

Common Mistakes

❌ 풀러요 (purreoyo) ✅ 푸르러요 (pureureoyo) → 푸르다 keeps 르 intact: 푸르 + 어요 → 푸르러요. ❌ Using the casual form (푸르어/아) in formal situations ✅ Use 푸르릅니다 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: 푸르러요. This is the form you'll use 90% of the time in daily life. Once it's automatic, add the past (푸르렀어요) and future (푸르를 거예요) to your toolkit. For 르-irregular verbs, make a list of 5 common ones and practice all their forms. The pattern will click after repetition.

푸르다: 푸르러요 (present) / 푸르렀어요 (past) / 푸르를 거예요 (future)

Examples

푸르러요 — pureureoyo — be blue/green (polite)

푸르렀어요 — pureureoteoyo — be blue/green (past)

푸르를 거예요 — pureureur geoyeyo — will be blue/green

푸르릅니다 — pureureupnida — be blue/green (formal)

안 푸르러요 — an pureureoyo — don't be blue/green