Verbseoul.
하다 verb
환불하다hwanbulhadato refund

To say to refund politely in the present tense, use 환불해요 (hwahn-bool-hae-yoh). Below is the full conjugation of 환불하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
환불해
hwahn-bool-hae
환불해요
hwahn-bool-hae-yoh
환불합니다
hwahn-bool-hahm-nee-dah
Past
환불했어
hwahn-bool-hae-ssuh
환불했어요
hwahn-bool-hae-ssuh-yoh
환불했습니다
hwahn-bool-hae-sseum-nee-dah
Future
환불할 거야
hwahn-bool-hahl- -guh-yah
환불할 거예요
hwahn-bool-hahl- -guh-yae-yoh
환불할 겁니다
hwahn-bool-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
환불하세요
hwahn-bool-hah-sae-yoh
Suggestion / Let's Polite (요)
환불해요
hwahn-bool-hae-yoh
Question Polite (요)
환불해요?
hwahn-bool-hae-yoh-?
Connective “and” — (고)
환불하고
hwahn-bool-hah-goh
Conditional “if” — (면)
환불하면
hwahn-bool-hah-myuhn
Noun form — (기)
환불함
hwahn-bool-hahm