KOREAN VERB

잊어버리다

to forget completely

Conjugation

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

Form	Polite	Formal	Casual
AffirmativeI forget completely
NegativeI don’t forget completely

과거 · finished actions: 갔어요, 갔습니다, 갔어

Form	Polite	Formal	Casual
AffirmativeI forgot completely
NegativeI didn’t forget completely

미래 · plans and guesses: -(으)ㄹ 거예요

Form	Polite	Formal	Casual
AffirmativeI will forget completely
NegativeI won’t forget completely

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

Form	Polite	Formal
PresentI forget completely (respectfully)
PastI forgot completely (respectfully)
FutureI will forget completely (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

저는 사람 이름을 금방 잊어버려요.

I forget people's names right away.
Past

은행 비밀번호를 또 완전히 잊어버렸어요.

I completely forgot my bank password again.
Future

지금 안 적으면 나중에 잊어버릴 거예요.

If you don't write it down now, you'll forget it later.
Honorific

할머니는 가끔 약 드시는 걸 잊어버리세요.

Grandma sometimes forgets to take her medicine.
Connectives

약속을 완전히 잊어버려서 친구한테 미안했어요.

I completely forgot the appointment, so I felt bad toward my friend.
Requests and commands

내일 회의 시간을 잊어버리지 마세요.

Don't forget tomorrow's meeting time.

잊다 is to forget; 잊어버리다 adds that it is gone for good. Don't mix it up with 잃어버리다, to lose a thing.

The same pattern, on other verbs: verb.