Korean Past Tense Conjugation: Complete Grammar Guide

Master korean past tense conjugation with clear rules, vowel harmony charts, irregular verbs, and 30+ examples for beginner to intermediate learners.

Korean Past Tense Conjugation: Complete Grammar Guide

If you can master korean past tense conjugation, you unlock half of daily Korean conversation. Telling friends what you did yesterday, reacting to K-drama plot twists, or answering 뭐 했어요? (mwo haesseoyo — what did you do?) all rely on one grammar pattern: 았/었/했어요.

This guide walks Arabic-speaking learners through every rule, chart, and irregular verb you need, with side-by-side examples.

The Core Formula

The Korean past tense is built by adding 았어요 / 었어요 / 했어요 to the verb stem. Formal speech uses 았습니다 / 었습니다 / 했습니다.

Stem Ending	Past Tense Ending	Example
Vowel ㅏ / ㅗ	았어요	가다 → 갔어요 (I went)
Other vowels	었어요	먹다 → 먹었어요 (I ate)
하다 verbs	했어요	공부하다 → 공부했어요 (I studied)

Step 1: Find the Verb Stem

Every Korean verb ends in 다 in dictionary form. Drop 다 to get the stem.

가다 (to go) → stem: 가
먹다 (to eat) → stem: 먹
좋아하다 (to like) → stem: 좋아하

Step 2: Apply Vowel Harmony

Look at the last vowel of the stem.

Rule A — Stem ends in ㅏ or ㅗ → add 았어요

가다 → 가 + 았어요 → 갔어요
보다 → 보 + 았어요 → 봤어요
살다 → 살 + 았어요 → 살았어요

Rule B — Stem ends in any other vowel → add 었어요

먹다 → 먹었어요
마시다 → 마셨어요
배우다 → 배웠어요
읽다 → 읽었어요

Rule C — 하다 verbs always become 했어요

공부하다 → 공부했어요
일하다 → 일했어요
사랑하다 → 사랑했어요
쇼핑하다 → 쇼핑했어요

Step 3: Handle Contractions

Korean contracts vowels when the stem is a single vowel.

Verb	Full Form	Natural Form
가다	가았어요	갔어요
서다	서었어요	섰어요
보다	보았어요	봤어요
주다	주었어요	줬어요
배우다	배우었어요	배웠어요
마시다	마시었어요	마셨어요

Step 4: Irregular Verbs You Must Know

ㄷ Irregular

듣다 (to listen) → 들었어요 걷다 (to walk) → 걸었어요

ㅂ Irregular

춥다 (to be cold) → 추웠어요 덥다 (to be hot) → 더웠어요 쉽다 (to be easy) → 쉬웠어요

ㅅ Irregular

짓다 (to build) → 지었어요 낫다 (to recover) → 나았어요

르 Irregular

모르다 (to not know) → 몰랐어요 빠르다 (to be fast) → 빨랐어요

으 Irregular

바쁘다 (to be busy) → 바빴어요 예쁘다 (to be pretty) → 예뻤어요

ㅎ Irregular

그렇다 (to be so) → 그랬어요 파랗다 (to be blue) → 파랬어요

Formal vs. Polite vs. Casual Past

Style	Pattern	Example (먹다)
Formal	았/었습니다	먹었습니다
Polite	았/었어요	먹었어요
Casual	았/었어	먹었어

Step 5: Negative Past

Add 안 before the verb or 지 않았어요 at the end.

안 먹었어요 / 먹지 않았어요 — I did not eat
안 갔어요 / 가지 않았어요 — I did not go

Step 6: Questions in Past Tense

Rising intonation turns any past tense into a question.

밥 먹었어요? — Did you eat?
어디 갔어요? — Where did you go?
영화 봤어요? — Did you watch the movie?

Example Paragraph to Read Aloud

어제 친구를 만났어요. 우리는 카페에 갔어요. 저는 아메리카노를 마셨어요. 친구는 녹차를 주문했어요. 같이 한국 드라마 이야기를 했어요. 정말 재미있었어요!

Translation: Yesterday I met a friend. We went to a cafe. I drank Americano. My friend ordered green tea. We talked about Korean dramas. It was really fun!

Common Mistakes to Avoid

Forgetting vowel harmony — 먹았어요 is wrong, it must be 먹었어요.
Using 하 + 았어요 instead of the contracted 했어요.
Ignoring irregulars — 듣었어요 is incorrect; it is 들었어요.
Mixing speech levels in one sentence.
Over-using 저는; Koreans drop subjects often.

Study Plan for the Next 14 Days

Day	Focus
1–3	Memorize Rule A, B, C with 20 verbs
4–6	Contractions and polite/formal forms
7–9	Irregular verbs by category
10–12	Read a K-drama script and underline past tense
13–14	Write a daily journal in past tense

Keep Building With Klovers

Past tense is the backbone of fluency. Klovers' courses walk you through every tense with live Arabic-speaking tutors, and our textbook includes 80+ past-tense drills. Take the free placement test to see how close you are to intermediate level.

Write one sentence today in Korean past tense — and keep going until it is a habit.

Quick Reference: korean past tense

Keep this mini-cheatsheet for korean past tense. Practice the key phrases aloud for five minutes every morning, and re-read this guide once a week. Consistency beats intensity — short daily reps build lasting fluency faster than weekend marathons.