Verbseoul.
하다 verb
고백하다gobaekhadato confess

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

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
고백해
goh-bae-kae
고백해요
goh-bae-kae-yoh
고백합니다
goh-bae-kahm-nee-dah
Past
고백했어
goh-bae-kae-ssuh
고백했어요
goh-bae-kae-ssuh-yoh
고백했습니다
goh-bae-kae-sseum-nee-dah
Future
고백할 거야
goh-bae-kahl- -guh-yah
고백할 거예요
goh-bae-kahl- -guh-yae-yoh
고백할 겁니다
goh-bae-kahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
고백하세요
goh-bae-kah-sae-yoh
Suggestion / Let's Polite (요)
고백해요
goh-bae-kae-yoh
Question Polite (요)
고백해요?
goh-bae-kae-yoh-?
Connective “and” — (고)
고백하고
goh-bae-kah-goh
Conditional “if” — (면)
고백하면
goh-bae-kah-myuhn
Noun form — (기)
고백함
goh-bae-kahm