KOREAN VERB

증명하다

to prove, to certify (a fact, an identity)

Conjugation

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현재 · now and habits: polite, formal and casual speech

Form	Polite	Formal	Casual
AffirmativeI prove
NegativeI don’t prove

과거 · finished actions: 갔어요, 갔습니다, 갔어

Form	Polite	Formal	Casual
AffirmativeI proved
NegativeI didn’t prove

미래 · plans and guesses: -(으)ㄹ 거예요

Form	Polite	Formal	Casual
AffirmativeI will prove
NegativeI won’t prove

높임말 · to or about an elder: the -시- forms

Form	Polite	Formal
PresentI prove (respectfully)
PastI proved (respectfully)
FutureI will prove (respectfully)

연결 어미 · and, so, if, because, but: joining two sentences

명령형 · -(으)세요, -(으)십시오, the casual form, -지 마세요

One sentence for each tense, the way people say it.

Present

이 서류가 제 주소를 증명해요.

This document proves my address.
Past

민준이는 실력으로 자기 말을 증명했어요.

Min-jun proved his words with his skill.
Future

여권으로 신분을 증명할 거예요.

I'll prove my identity with my passport.
Honorific

김 부장님이 회의에서 그 방법을 증명하셨어요.

Mr. Kim proved that method at the meeting.
Connectives

이 서류는 소득을 증명하니까 잘 보관하세요.

This paper proves your income, so keep it safe.
Requests and commands

창구에서 신분증으로 본인임을 먼저 증명하십시오.

At the counter, first prove your identity with your ID.

증명하다 is the office word: a 증명서 is a certificate, and 신분을 증명하다 is to prove who you are; in an argument you just 보여 주다.

The lessons that teach a form of it, and how they say it.

Fluency Level 3 · 증명하는 서류입니다. 구청에서 발급받습니다.

The same pattern, on other verbs: 하다 verb.