Verbseoul.
하다 verb
인증하다injeunghadato certify

To say to certify politely in the present tense, use 인증해요 (een-cheung-hae-yoh). Below is the full conjugation of 인증하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
인증해
een-cheung-hae
인증해요
een-cheung-hae-yoh
인증합니다
een-cheung-hahm-nee-dah
Past
인증했어
een-cheung-hae-ssuh
인증했어요
een-cheung-hae-ssuh-yoh
인증했습니다
een-cheung-hae-sseum-nee-dah
Future
인증할 거야
een-cheung-hahl- -guh-yah
인증할 거예요
een-cheung-hahl- -guh-yae-yoh
인증할 겁니다
een-cheung-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
인증하세요
een-cheung-hah-sae-yoh
Suggestion / Let's Polite (요)
인증해요
een-cheung-hae-yoh
Question Polite (요)
인증해요?
een-cheung-hae-yoh-?
Connective “and” — (고)
인증하고
een-cheung-hah-goh
Conditional “if” — (면)
인증하면
een-cheung-hah-myuhn
Noun form — (기)
인증함
een-cheung-hahm