Verbseoul.
하다 verb
방역하다bangyeokhadato prevent an epidemic (of)

To say to prevent an epidemic (of) politely in the present tense, use 방역해요 (bahng-yuh-kae-yoh). Below is the full conjugation of 방역하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
방역해
bahng-yuh-kae
방역해요
bahng-yuh-kae-yoh
방역합니다
bahng-yuh-kahm-nee-dah
Past
방역했어
bahng-yuh-kae-ssuh
방역했어요
bahng-yuh-kae-ssuh-yoh
방역했습니다
bahng-yuh-kae-sseum-nee-dah
Future
방역할 거야
bahng-yuh-kahl- -guh-yah
방역할 거예요
bahng-yuh-kahl- -guh-yae-yoh
방역할 겁니다
bahng-yuh-kahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
방역하세요
bahng-yuh-kah-sae-yoh
Suggestion / Let's Polite (요)
방역해요
bahng-yuh-kae-yoh
Question Polite (요)
방역해요?
bahng-yuh-kae-yoh-?
Connective “and” — (고)
방역하고
bahng-yuh-kah-goh
Conditional “if” — (면)
방역하면
bahng-yuh-kah-myuhn
Noun form — (기)
방역함
bahng-yuh-kahm