Verbseoul.
하다 verb

교환하다 conjugation (gyohwanhada, to exchange)

To say to exchange politely in the present tense, use 교환해요 (gyoh-hwahn-hae-yoh) · gyohwanhaeyo. Below is the full conjugation of 교환하다 across the three tenses and three everyday speech levels.

Grammar note (하다 verb): 하다 verbs are formed with a Sino-Korean noun + 하다 (e.g. 공부하다 = study + do). 하다 conjugates irregularly: the ㅏ in 하 contracts with the -아/-어 suffix to give 해 (not *하어). Present polite: 해요; past polite: 했어요. The formal ending is 합니다 (not *하습니다). Most noun+하다 compounds follow this pattern uniformly. See all 하다 verbs →

Conjugation table

pron. = pronunciation guide  · RR = Revised Romanization

Highlighted = where the stem changes

TenseCasual (반말)Polite (요)Formal (합니다)
Present
교환해
gyoh-hwahn-hae
gyohwanhae
교환해요
gyoh-hwahn-hae-yoh
gyohwanhaeyo
교환합니다
gyoh-hwahn-hahm-nee-dah
gyohwanhamnida
Past
교환했어
gyoh-hwahn-hae-ssuh
gyohwanhaesseo
교환했어요
gyoh-hwahn-hae-ssuh-yoh
gyohwanhaesseoyo
교환했습니다
gyoh-hwahn-hae-sseum-nee-dah
gyohwanhaesseumnida
Future
교환할 거야
gyoh-hwahn-hahl guh-yah
gyohwanhal geoya
교환할 거예요
gyoh-hwahn-hahl guh-yae-yoh
gyohwanhal geoyeyo
교환할 겁니다
gyoh-hwahn-hahl guhm-nee-dah
gyohwanhal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
교환하세요
gyoh-hwahn-hah-sae-yoh
gyohwanhaseyo
Suggestion / Let's Polite (요)
교환해요
gyoh-hwahn-hae-yoh
gyohwanhaeyo
Question Polite (요)
교환해요?
gyoh-hwahn-hae-yoh-?
gyohwanhaeyo?
Connective "and" — (고)
교환하고
gyoh-hwahn-hah-goh
gyohwanhago
Conditional "if" — (면)
교환하면
gyoh-hwahn-hah-myuhn
gyohwanhamyeon
Progressive (고 있어요)
교환하고 있어요
gyoh-hwahn-hah-goh ee-ssuh-yoh
gyohwanhago isseoyo
Want to (고 싶어요)
교환하고 싶어요
gyoh-hwahn-hah-goh shee-puh-yoh
gyohwanhago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
교환할 수 있어요
gyoh-hwahn-hahl soo ee-ssuh-yoh
gyohwanhal su isseoyo
Because / So (아/어서)
교환해서
gyoh-hwahn-hae-suh
gyohwanhaeseo
Noun form — (기)
교환하기
gyoh-hwahn-hah-gee
gyohwanhagi
Noun form — (음)
교환함
gyoh-hwahn-hahm
gyohwanham