Verbseoul.
하다 verb
축하하다chukhahadato congratulate, to celebrate, to felicitate

To say to congratulate, to celebrate, to felicitate politely in the present tense, use 축하해요 (choo-kah-hae-yoh). Below is the full conjugation of 축하하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
축하해
choo-kah-hae
축하해요
choo-kah-hae-yoh
축하합니다
choo-kah-hahm-nee-dah
Past
축하했어
choo-kah-hae-ssuh
축하했어요
choo-kah-hae-ssuh-yoh
축하했습니다
choo-kah-hae-sseum-nee-dah
Future
축하할 거야
choo-kah-hahl- -guh-yah
축하할 거예요
choo-kah-hahl- -guh-yae-yoh
축하할 겁니다
choo-kah-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
축하하세요
choo-kah-hah-sae-yoh
Suggestion / Let's Polite (요)
축하해요
choo-kah-hae-yoh
Question Polite (요)
축하해요?
choo-kah-hae-yoh-?
Connective “and” — (고)
축하하고
choo-kah-hah-goh
Conditional “if” — (면)
축하하면
choo-kah-hah-myuhn
Noun form — (기)
축하함
choo-kah-hahm