Verbseoul.
ㄹ stem

열다 conjugation (yeolda, to open)

To say to open politely in the present tense, use 열어요 (yuh-ruh-yoh) · yeoreoyo. Below is the full conjugation of 열다 across the three tenses and three everyday speech levels.

Grammar note (ㄹ stem): ㄹ-stem verbs end in ㄹ as the final consonant. They are conjugated regularly with vowel suffixes (살다 → 살아요), but the ㄹ drops before certain consonant suffixes — specifically before ㄴ, ㅂ, ㅅ, and before the formal ending 습니다: 살다 → 사는, 삽니다, 살지 (ㄹ kept before ㅈ). This is sometimes called a "ㄹ drop" or "ㄹ irregular." See all ㄹ-stem verbs →

Conjugation table

pron. = pronunciation guide  · RR = Revised Romanization

Highlighted = where the stem changes

TenseCasual (반말)Polite (요)Formal (합니다)
Present
열어
yuh-ruh
yeoreo
열어요
yuh-ruh-yoh
yeoreoyo
엽니다
yuhm-nee-dah
yeomnida
Past
열었어
yuh-ruh-ssuh
yeoreosseo
열었어요
yuh-ruh-ssuh-yoh
yeoreosseoyo
열었습니다
yuh-ruh-sseum-nee-dah
yeoreosseumnida
Future
열 거야
yuhl guh-yah
yeol geoya
열 거예요
yuhl guh-yae-yoh
yeol geoyeyo
열 겁니다
yuhl guhm-nee-dah
yeol geomnida

Example sentences

How it’s used

열다 means to open doors, windows and boxes, to open a business, and to hold an event: 파티를 열다, 회의를 열다. For something that opens by itself or is opened, use 열리다: 문이 열려요. As an ㄹ-stem verb it drops ㄹ before ㄴ, ㅂ and ㅅ: 엽니다, 여세요, 여는 시간.

Common mistake

Using 열다 without someone doing the opening: ✗ 문이 열어요 → ✓ 문이 열려요 (“the door opens”).

Other useful forms

Honorific / Command Polite (-(으)세요)
여세요
yuh-sae-yoh
yeoseyo
Suggestion / Let's Polite (요)
열어요
yuh-ruh-yoh
yeoreoyo
Question Polite (요)
열어요?
yuh-ruh-yoh-?
yeoreoyo?
Connective "and" — (고)
열고
yuhl-goh
yeolgo
Conditional "if" — (면)
열면
yuhl-myuhn
yeolmyeon
Progressive (고 있어요)
열고 있어요
yuhl-goh ee-ssuh-yoh
yeolgo isseoyo
Want to (고 싶어요)
열고 싶어요
yuhl-goh shee-puh-yoh
yeolgo sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
열 수 있어요
yuhl soo ee-ssuh-yoh
yeol su isseoyo
Because / So (아/어서)
열어서
yuh-ruh-suh
yeoreoseo
Noun form — (기)
열기
yuhl-gee
yeolgi
Noun form — (음)
엶
yuhm
yeom