유효하다 (to be valid (a passport, a ticket, a visa)) · Korean verb conjugation

Conjugation

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

Form	Polite	Formal	Casual
AffirmativeI am valid
NegativeI am not valid

과거 · finished actions: 갔어요, 갔습니다, 갔어

Form	Polite	Formal	Casual
AffirmativeI was valid
NegativeI was not valid

미래 · plans and guesses: -(으)ㄹ 거예요

Form	Polite	Formal	Casual
AffirmativeI will be valid
NegativeI won’t be valid

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

Form	Polite	Formal
PresentI am valid (respectfully)
PastI was valid (respectfully)
FutureI will be valid (respectfully)

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

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

Present

이 비자는 내년 삼월까지 유효해요.

This visa is valid until next March.
Past

그 할인 쿠폰은 지난주까지만 유효했어요.

That discount coupon was only valid until last week.
Future

새 여권은 십 년 동안 유효할 거예요.

The new passport will be valid for ten years.
Honorific

할아버지, 그 여권은 아직 유효하세요?

Grandpa, is that passport still valid?
Connectives

표는 유효하지만 좌석은 바꿀 수 없어요.

The ticket is valid, but you can't change the seat.

유효하다 is formal, for documents: a visa, a ticket, a coupon; the 유효 기간 is the expiry date.

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

9

Advanced Level 3 · 네 여권은 유효한지. 삼 년 남았네.

The same pattern, on other verbs: descriptive verb.