Verbseoul.
하다 verb
거부하다geobuhadato refuse

To say to refuse politely in the present tense, use 거부해요 (guh-boo-hae-yoh). Below is the full conjugation of 거부하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
거부해
guh-boo-hae
거부해요
guh-boo-hae-yoh
거부합니다
guh-boo-hahm-nee-dah
Past
거부했어
guh-boo-hae-ssuh
거부했어요
guh-boo-hae-ssuh-yoh
거부했습니다
guh-boo-hae-sseum-nee-dah
Future
거부할 거야
guh-boo-hahl- -guh-yah
거부할 거예요
guh-boo-hahl- -guh-yae-yoh
거부할 겁니다
guh-boo-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
거부하세요
guh-boo-hah-sae-yoh
Suggestion / Let's Polite (요)
거부해요
guh-boo-hae-yoh
Question Polite (요)
거부해요?
guh-boo-hae-yoh-?
Connective “and” — (고)
거부하고
guh-boo-hah-goh
Conditional “if” — (면)
거부하면
guh-boo-hah-myuhn
Noun form — (기)
거부함
guh-boo-hahm