KOREAN VERB

바꾸다

to change, to exchange

Conjugation

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

Form	Polite	Formal	Casual
AffirmativeI change
NegativeI don’t change

과거 · finished actions: 갔어요, 갔습니다, 갔어

Form	Polite	Formal	Casual
AffirmativeI changed
NegativeI didn’t change

미래 · plans and guesses: -(으)ㄹ 거예요

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

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

Form	Polite	Formal
PresentI change (respectfully)
PastI changed (respectfully)
FutureI will change (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 보통 공항에서 달러를 원으로 바꿔요.

I usually change dollars into won at the airport.
Past

비가 와서 주말 계획을 바꿨어요.

It rained, so we changed our weekend plans.
Future

다음 달에 휴대폰을 새것으로 바꿀 거예요.

Next month I'll change my phone for a new one.
Honorific

박 선생님은 머리 모양을 바꾸셨네요.

Mrs. Park has changed her hairstyle.
Connectives

사이즈를 바꾸면 돈을 더 내야 해요?

If I change the size, do I have to pay more?
Requests and commands

비밀번호를 석 달마다 한 번씩 바꾸세요.

Change your password once every three months.

바꾸다 changes something (계획을 바꿔요); 바뀌다 is for a thing that changes by itself (계획이 바뀌었어요).

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

Intermediate Level 2 · 날짜를 바꿀 경우에는요?

The same pattern, on other verbs: verb.