Korean Verb Conjugation Guide: Tenses, Politeness, and Real Patterns

Korean verb conjugation is simpler than it looks once you treat it as a system: take the verb stem (dictionary form minus -다), then add endings that express politeness (speech level) and grammar (tense, mood, or connection). If you learn the polite everyday style 해요체 first, you can say most real-life sentences by mastering three core endings: -아요/-어요 (present), -았어요/-었어요 (past), and -(으)ㄹ 거예요 (future).

Korean is spoken by roughly 82 million people worldwide (Ethnologue, 27th edition, 2024), and the conjugation you hear in K-dramas and daily Seoul speech is heavily shaped by politeness choices, not by person or number. That is why a “verb conjugation guide” in Korean is also a guide to social tone.

If you want quick survival phrases while you build conjugation skill, start with greetings from our how to say hello in Korean guide, then come back here to understand why those endings change.

What “conjugation” means in Korean (and why it feels different)

In English, conjugation often means changing the verb for person (I am, you are) or tense (walk, walked). Korean does not change verbs for person or number, so “I go” and “they go” share the same verb form.

Instead, Korean conjugation packs meaning into the ending: politeness, tense, mood, and whether the sentence is a statement, question, suggestion, or command. This is why the same verb stem can produce many surface forms.

Linguist Ho-min Sohn, in his work on Korean, emphasizes that speech levels are a core part of Korean grammar, not an optional “politeness add-on.” If you ignore them, you can be grammatically correct and still sound socially wrong.

Start here: dictionary form, stem, and vowel harmony basics

Dictionary form (-다)

Verbs in dictionaries end in -다, like 가다 (to go) or 먹다 (to eat). This is not the form you use in normal conversation.

Stem (remove -다)

Remove -다 to get the stem:

• 가다 → 가-
• 먹다 → 먹-
• 하다 → 하-

From there, you attach endings.

The key choice: -아 vs -어

For many endings, you choose between an 아-family vowel and an 어-family vowel based on the last vowel in the stem.

A practical beginner rule:

• If the stem’s last vowel is ㅏ or ㅗ, it usually takes -아.
• Otherwise, it usually takes -어.

Examples:

• 가- (ㅏ) → 가요
• 오- (ㅗ) → 와요 (contraction)
• 먹- (ㅓ) → 먹어요
• 마시- (ㅣ) → 마셔요 (contraction)

The most useful speech level: 해요체 (polite everyday)

해요체 is the default polite style for daily life: talking to strangers, coworkers you are not close with, service staff, classmates, and most casual public situations. It is also the style many textbooks prioritize early.

In real conversation, it is common to mix 해요체 with friendly intonation and contractions. That mix is a big part of sounding natural.

Present tense in 해요체: -아요 / -어요 / -해요

How to form it

1. Take the stem.
2. Add -아요 or -어요.
3. Apply common contractions.

Here are the patterns you will meet constantly:

• 가다 → 가요 (not 가아요)
• 먹다 → 먹어요
• 마시다 → 마셔요
• 보다 → 봐요
• 오다 → 와요
• 하다 → 해요

Pronunciation notes (so you recognize it in dramas)

Korean speech often reduces syllables. You will hear:

• 하여요 → 해요
• 보아요 → 봐요
• 오아요 (not used) but 오 + 아요 becomes 와요

This is why “textbook-looking” forms can feel different from what you hear.

하다 verbs: the productivity engine of Korean

A huge number of Korean verbs are built with 하다, often from Sino-Korean nouns (공부하다, 운동하다). Once you know 하다 → 해요, you unlock a lot of vocabulary quickly.

This is one reason many learners feel Korean “speeds up” after the first few hundred words.

Past tense in 해요체: -았어요 / -었어요 / -했어요

How to form it

1. Take the stem.
2. Add -았- after ㅏ/ㅗ stems, otherwise -었-.
3. Add -어요 to finish the polite ending.

Examples:

• 가다 → 갔어요
• 오다 → 왔어요
• 먹다 → 먹었어요
• 마시다 → 마셨어요
• 하다 → 했어요

What it means in real use

In everyday Korean, this past form is used for completed actions and also for “current state resulting from a past action” in some contexts, depending on the verb. You will later learn the separate result-state form -아/어 있다, but do not wait for perfection to start speaking.

Future in 해요체: -(으)ㄹ 거예요

This is the most common spoken future construction for plans and predictions.

How to form it

• If the stem ends in a consonant: add -을 거예요
• If it ends in a vowel: add -ㄹ 거예요

Examples:

• 먹다 → 먹을 거예요
• 가다 → 갈 거예요
• 하다 → 할 거예요

Cultural tone: “soft future”

-(으)ㄹ 거예요 often sounds less rigid than an English “will.” It can feel like “I’m going to” or “I think I’ll,” depending on context and intonation.

If you want a more formal future, you will see -겠습니다 in announcements and speeches, but it is not the first thing to learn for daily conversation.

The casual style: 해체 (-아 / -어)

Once you control 해요체, dropping politeness is mechanically easy: you remove 요 and often use the shorter ending.

Examples:

• 가요 → 가
• 먹어요 → 먹어
• 했어요 → 했어
• 갈 거예요 → 갈 거야

This is the style used with close friends, siblings, and people the same age when you have that relationship. It is also the style you hear constantly in K-dramas between close characters.

For more on how politeness shows up in everyday phrases, compare the endings in how to say goodbye in Korean and notice when 요 appears and when it disappears.

The formal polite style: 합니다체 (-(스)ㅂ니다)

합니다체 is common in formal presentations, news, official announcements, and some workplace contexts. It is polite, but more distant and “public.”

Statement: -(스)ㅂ니다

• If the stem ends in a vowel: -ㅂ니다
• If the stem ends in a consonant: -습니다

Examples:

• 가다 → 갑니다
• 먹다 → 먹습니다
• 하다 → 합니다

Question: -(스)ㅂ니까?

Examples:

• 갑니까?
• 먹습니까?
• 합니까?

Connecting verbs: the endings that make Korean sound fluent

A big jump in Korean happens when you stop speaking in isolated sentences and start chaining clauses. These connective endings are high-frequency in speech and subtitles.

-고 (and, then)

• 밥 먹고 커피 마셔요.
  “I eat, then I drink coffee.”

-(아/어)서 (so, because, and then)

• 집에 가서 쉬어요.
  “I go home and rest.”

It often implies a natural sequence or reason, and it is extremely common in spoken Korean.

-(으)면 (if, when)

• 시간 있으면 만나요.
  “If you have time, let’s meet.”

-지만 (but, although)

• 비싸지만 맛있어요.
  “It’s expensive, but it’s tasty.”

These endings are where conjugation becomes “real Korean,” because they force you to handle stems quickly.

The essential irregulars (the ones you actually meet early)

Korean has several irregular conjugation patterns. You do not need all of them at once, but you do need the common ones early because they appear in everyday verbs.

The National Institute of Korean Language’s grammar resources (온라인가나다) treat these as standard patterns, not exceptions you can ignore. Learn them as “alternate stem behaviors.”

ㅂ irregular

Some ㅂ-ending adjectives and verbs change ㅂ to 우/오 before a vowel ending.

• 춥다 (cold) → 추워요
• 덥다 (hot) → 더워요

Not every ㅂ verb is irregular, but these two are so common that they are worth memorizing immediately.

ㄷ irregular

Some ㄷ changes to ㄹ before a vowel.

• 듣다 (listen) → 들어요
• 걷다 (walk) → 걸어요

ㅅ irregular

Some ㅅ disappears before a vowel.

• 짓다 (build) → 지어요

르 irregular

르 doubles to ㄹㄹ and adds 아/어.

• 모르다 → 몰라요
• 빠르다 → 빨라요

하다 contractions (very common)

• 하 + 아요 → 해요
• 하 + 았어요 → 했어요

If you only memorize one contraction pattern, make it this one.

Verb vs adjective in Korean: both “conjugate”

In Korean, descriptive words like 예쁘다 (pretty) and 크다 (big) behave like verbs in that they conjugate into sentence endings. Many textbooks call them “adjectives,” but functionally they are often “descriptive verbs.”

Examples:

• 예뻐요. “It’s pretty.”
• 컸어요. “It was big.”

This matters because learners sometimes wait to “learn adjectives later,” but you are already conjugating them from day one.

Negation: 안 and -지 않다

안 + verb (simple, common)

• 안 가요. “I’m not going.”
• 안 먹어요. “I don’t eat it.”

-지 않다 (more explicit, flexible)

• 가지 않아요.
• 먹지 않아요.

Both are normal. 안 is shorter and very common in speech, while -지 않다 can feel slightly more deliberate.

Asking politely: -아요/-어요 as a question, and -주세요

A statement ending becomes a question with intonation:

• 가요? “Are you going?”
• 먹어요? “Do you eat it?”

For polite requests, -주세요 is one of the most useful patterns:

• 물 주세요. “Water, please.”
• 도와주세요. “Please help me.”

You will hear this constantly in service contexts, which is why pairing it with real listening practice matters. If you are building practical phrase fluency, our how to say I love you in Korean guide is a good example of how endings shift with intimacy and tone.

Honorifics in conjugation: -(으)시-

Honorifics show respect to the subject of the sentence (often a senior person), not to the listener. This is a key Korean concept.

Add -(으)시- before the ending

• 가다 → 가세요 (from 가 + 시 + 어요)
• 먹다 → 드세요 (suppletive honorific for 먹다 in many contexts)
• 하다 → 하세요

Even if you are not ready to use honorifics actively, you should recognize them. They appear in announcements, customer service, and family talk.

King Sejong Institute materials introduce -(으)시- early because it is a real-life necessity, not an advanced grammar decoration.

A practical “one-week” conjugation plan that works

Day 1: Stem extraction and present 해요체

Pick 20 high-frequency verbs and make the present polite form automatic. Say them out loud.

Day 2: Past tense

Convert the same 20 verbs into past. Drill the contractions (갔어요, 왔어요, 했어요).

Day 3: Future plans

Add -(으)ㄹ 거예요 to the same set. Practice “tomorrow” sentences.

Day 4: Connectors

Add -고 and -(아/어)서. Now you can speak in two-clause thoughts.

Day 5: Negation

Add 안 and -지 않다. Make positive and negative pairs.

Day 6: Casual conversion

Convert your most-used sentences from 해요체 to 해체. Do not use them with strangers yet, but train your ear for dramas.

Day 7: Irregular review

Focus on 덥다/춥다, 듣다/걷다, 모르다/빠르다. These show up constantly.

If you want a broader roadmap for building usable grammar through real input, see how to learn a language with movies. Conjugation sticks faster when you repeatedly hear the same endings in context.

How to hear conjugation in real speech (and not miss it)

Korean endings are short and often reduced. In fast speech, the “grammar” can feel like it disappears.

Train your ear for:

• 요 as a politeness marker
• ㅆ as a past marker (갔-, 했-)
• ㄹ 거 as a future marker (갈 거-, 할 거-)
• 서/고/면 as clause connectors

This is also why subtitles are so useful: you can pause and map the sound to the ending.

If you are also curious about how Korean changes tone through taboo language and intensity, our guide to Korean swear words explains why some endings and particles get dropped or sharpened in heated speech. Do not copy those forms, but do learn to recognize them.

Common mistakes that block progress (and quick fixes)

Mistake 1: trying to learn every speech level at once

Fix: master 해요체 first. Add 합니다체 only when you need it.

Mistake 2: treating contractions as “slang”

Fix: contractions like 해요, 봐요, 와요 are standard spoken Korean.

Mistake 3: memorizing rules but not verbs

Fix: conjugation is a skill, not a chart. Drill 20 verbs deeply, then expand.

Mistake 4: ignoring honorifics completely

Fix: at least recognize -(으)시- and common honorific requests like -세요.

Using Korean conjugation inside Wordy-style clip learning

The fastest way to make endings automatic is to attach them to scenes you remember. When you repeatedly hear a character say 갔어요 in a specific situation, your brain stores the conjugation as a chunk, not as a rule.

A good workflow is: save the line, isolate the verb, then generate 5 variations (present, past, future, negative, connector). That turns one subtitle into a mini conjugation drill.

For more Korean foundations that pair well with this approach, browse the Wordy blog and build a small “grammar plus listening” routine instead of doing conjugation in isolation.