Verbseoul.
하다 verb

고백하다 conjugation (gobaekhada, to confess)

To say to confess politely in the present tense, use 고백해요 (goh-bae-kae-yoh) · gobaekaeyo. Below is the full conjugation of 고백하다 across the three tenses and three everyday speech levels.

Grammar note (하다 verb): 하다 verbs are formed with a Sino-Korean noun + 하다 (e.g. 공부하다 = study + do). 하다 conjugates irregularly: the ㅏ in 하 contracts with the -아/-어 suffix to give 해 (not *하어). Present polite: 해요; past polite: 했어요. The formal ending is 합니다 (not *하습니다). Most noun+하다 compounds follow this pattern uniformly. See all 하다 verbs →

Conjugation table

pron. = pronunciation guide  · RR = Revised Romanization

Highlighted = where the stem changes

TenseCasual (반말)Polite (요)Formal (합니다)
Present
고백해
goh-bae-kae
gobaekae
고백해요
goh-bae-kae-yoh
gobaekaeyo
고백합니다
goh-bae-kahm-nee-dah
gobaekamnida
Past
고백했어
goh-bae-kae-ssuh
gobaekaesseo
고백했어요
goh-bae-kae-ssuh-yoh
gobaekaesseoyo
고백했습니다
goh-bae-kae-sseum-nee-dah
gobaekaesseumnida
Future
고백할 거야
goh-bae-kahl guh-yah
gobaekal geoya
고백할 거예요
goh-bae-kahl guh-yae-yoh
gobaekal geoyeyo
고백할 겁니다
goh-bae-kahl guhm-nee-dah
gobaekal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
고백하세요
goh-bae-kah-sae-yoh
gobaekaseyo
Suggestion / Let's Polite (요)
고백해요
goh-bae-kae-yoh
gobaekaeyo
Question Polite (요)
고백해요?
goh-bae-kae-yoh-?
gobaekaeyo?
Connective "and" — (고)
고백하고
goh-bae-kah-goh
gobaekago
Conditional "if" — (면)
고백하면
goh-bae-kah-myuhn
gobaekamyeon
Progressive (고 있어요)
고백하고 있어요
goh-bae-kah-goh ee-ssuh-yoh
gobaekago isseoyo
Want to (고 싶어요)
고백하고 싶어요
goh-bae-kah-goh shee-puh-yoh
gobaekago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
고백할 수 있어요
goh-bae-kahl soo ee-ssuh-yoh
gobaekal su isseoyo
Because / So (아/어서)
고백해서
goh-bae-kae-suh
gobaekaeseo
Noun form — (기)
고백하기
goh-bae-kah-gee
gobaekagi
Noun form — (음)
고백함
goh-bae-kahm
gobaekam