How to Conjugate 잇다 (to connect): ㅅ-irregular Pattern

ㅅ irregular: ㅅ disappears before vowels. 잇 + 어요 → 이어요. Don't confuse with 있다 (to exist, regular).

The Rule

ㅅ irregular: ㅅ disappears before vowels. 잇 + 어요 → 이어요. Don't confuse with 있다 (to exist, regular). 잇다 follows the ㅅ-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 ㅅ-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 ㅅ-irregular rule, you can predict how all ㅅ-irregular verbs behave.

How It Works

Stem: 잇 Polite present (해요체): 이어요 Polite past: 이었어요 Polite future: 이을 거예요 Formal (합쇼체): 잇습니다 Negative: 안 이어요 Notice how the stem "잇" changes in some forms. This is the ㅅ-irregular pattern in action.

Real Examples

• 이어요 (ieoyo) — "connect (polite present)" • 이었어요 (ieoteoyo) — "connect (past)" • 이을 거예요 (ieur geoyeyo) — "will connect (future)" • 잇습니다 (itseupnida) — "connect (formal)" • 안 이어요 (an ieoyo) — "don't connect"

Common Mistakes

❌ 잇어요 (iteoyo) ✅ 이어요 (ieoyo) → ㅅ drops: 잇 + 어요 → 이어요. But 있다 is regular: 있어요! ❌ Using the casual form (잇어/아) in formal situations ✅ Use 잇습니다 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: 이어요. This is the form you'll use 90% of the time in daily life. Once it's automatic, add the past (이었어요) and future (이을 거예요) to your toolkit. For ㅅ-irregular verbs, make a list of 5 common ones and practice all their forms. The pattern will click after repetition.

잇다: 이어요 (present) / 이었어요 (past) / 이을 거예요 (future)

Examples

이어요 — ieoyo — connect (polite)

이었어요 — ieoteoyo — connect (past)

이을 거예요 — ieur geoyeyo — will connect

잇습니다 — itseupnida — connect (formal)

안 이어요 — an ieoyo — don't connect