Verbseoul.
하다 verb
보충하다bochunghadato supplement

To say to supplement politely in the present tense, use 보충해요 (boh-choong-hae-yoh). Below is the full conjugation of 보충하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
보충해
boh-choong-hae
보충해요
boh-choong-hae-yoh
보충합니다
boh-choong-hahm-nee-dah
Past
보충했어
boh-choong-hae-ssuh
보충했어요
boh-choong-hae-ssuh-yoh
보충했습니다
boh-choong-hae-sseum-nee-dah
Future
보충할 거야
boh-choong-hahl- -guh-yah
보충할 거예요
boh-choong-hahl- -guh-yae-yoh
보충할 겁니다
boh-choong-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
보충하세요
boh-choong-hah-sae-yoh
Suggestion / Let's Polite (요)
보충해요
boh-choong-hae-yoh
Question Polite (요)
보충해요?
boh-choong-hae-yoh-?
Connective “and” — (고)
보충하고
boh-choong-hah-goh
Conditional “if” — (면)
보충하면
boh-choong-hah-myuhn
Noun form — (기)
보충함
boh-choong-hahm