Expression dictionary — full article
Time Expressions · Past tense, did, was/were
The V+았/었/였 grammar pattern is the fundamental past tense marker in Korean. It attaches to the stem of verbs and adjectives to indicate that an action or state occurred and was completed in the past, relative to the moment of speaking. It is a core component for expressing past events, experiences, and conditions.
This past tense marker is used in a wide range of situations to describe events or states that took place before the present moment.
The choice between 았, 었, and 였 depends on the last vowel of the verb or adjective stem.
Stem ends in ㅏ or ㅗ: Attach -았.
Stem ends in any other vowel (ㅓ, ㅜ, ㅡ, ㅣ, etc.) or a consonant: Attach -었.
Stem ends in 하다: Attach -였, which almost always contracts to -했.
Irregular Verbs/Adjectives: Remember to apply irregular conjugation rules (e.g., ㄷ irregular, ㅂ irregular, 르 irregular, ㅅ irregular) before attaching the past tense ending.
았/었 is attached. For instance, 오다 + 았어요 becomes 왔어요, 보다 + 았어요 becomes 봤어요. These contractions are standard and essential for natural Korean speech.V+았/었/였 is the base form for all past tense expressions. It combines with various sentence endings (e.g., polite informal -어요, polite formal -습니다, declarative -다, interrogative -니) to form complete sentences.V+았/었/였 often translates to the English simple past, it can sometimes overlap with the present perfect in meaning, especially when the past action has a direct result or relevance to the present. However, Korean has other constructions for emphasizing the perfect aspect (e.g., -아/어 있다, -아/어 버리다). V+았/었/였 primarily focuses on the completion of an action or state in the past.