Vocabulary gets you understood; sentence endings are what make you sound like you actually speak the language. Here are five worth mastering early.

1. ~요 — The Polite Everyday Ending

~요 (yo) is the backbone of 해요체, Korea’s default polite-but-casual speech style — appropriate with strangers, coworkers, and most everyday situations without sounding overly stiff.

2. 입니다 — The Formal Ending

입니다 (ibnida) dials the formality up several notches, appearing in news broadcasts, business presentations, and any setting where 해요체 would feel too casual.

3. 아요/어요 — Casual-Polite Verb Endings

아요/어요 (ayo-eoyo) are the verb-conjugation endings that actually produce that ~요 politeness on action words — the difference between a bare verb stem and a sentence you can actually say out loud to someone.

4. 있어요/없어요 — Existence and Possession

있어요 (isseoyo) — “there is/I have” — and 없어요 (eopseoyo) — “there isn’t/I don’t have” — are two of the most frequently used predicates in the language, covering everything from describing a room to explaining you’re out of cash.

Putting It All Together in Conversation

Mix and match these correctly and a sentence like “시간 있어요?” (“do you have time?”) or “돈 없어요” (“I don’t have money”) comes out sounding natural rather than textbook-stiff — which is exactly the gap between knowing vocabulary and sounding fluent.