Verbseoul.
하다 verb
후회하다huhoehadato regret

To say to regret politely in the present tense, use 후회해요 (hoo-hwae-hae-yoh). Below is the full conjugation of 후회하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
후회해
hoo-hwae-hae
후회해요
hoo-hwae-hae-yoh
후회합니다
hoo-hwae-hahm-nee-dah
Past
후회했어
hoo-hwae-hae-ssuh
후회했어요
hoo-hwae-hae-ssuh-yoh
후회했습니다
hoo-hwae-hae-sseum-nee-dah
Future
후회할 거야
hoo-hwae-hahl- -guh-yah
후회할 거예요
hoo-hwae-hahl- -guh-yae-yoh
후회할 겁니다
hoo-hwae-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
후회하세요
hoo-hwae-hah-sae-yoh
Suggestion / Let's Polite (요)
후회해요
hoo-hwae-hae-yoh
Question Polite (요)
후회해요?
hoo-hwae-hae-yoh-?
Connective “and” — (고)
후회하고
hoo-hwae-hah-goh
Conditional “if” — (면)
후회하면
hoo-hwae-hah-myuhn
Noun form — (기)
후회함
hoo-hwae-hahm