Verbseoul.
하다 verb

교체하다 conjugation (gyochehada, to change)

To say to change politely in the present tense, use 교체해요 (gyoh-chae-hae-yoh) · gyochehaeyo. Below is the full conjugation of 교체하다 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
교체해
gyoh-chae-hae
gyochehae
교체해요
gyoh-chae-hae-yoh
gyochehaeyo
교체합니다
gyoh-chae-hahm-nee-dah
gyochehamnida
Past
교체했어
gyoh-chae-hae-ssuh
gyochehaesseo
교체했어요
gyoh-chae-hae-ssuh-yoh
gyochehaesseoyo
교체했습니다
gyoh-chae-hae-sseum-nee-dah
gyochehaesseumnida
Future
교체할 거야
gyoh-chae-hahl guh-yah
gyochehal geoya
교체할 거예요
gyoh-chae-hahl guh-yae-yoh
gyochehal geoyeyo
교체할 겁니다
gyoh-chae-hahl guhm-nee-dah
gyochehal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
교체하세요
gyoh-chae-hah-sae-yoh
gyochehaseyo
Suggestion / Let's Polite (요)
교체해요
gyoh-chae-hae-yoh
gyochehaeyo
Question Polite (요)
교체해요?
gyoh-chae-hae-yoh-?
gyochehaeyo?
Connective "and" — (고)
교체하고
gyoh-chae-hah-goh
gyochehago
Conditional "if" — (면)
교체하면
gyoh-chae-hah-myuhn
gyochehamyeon
Progressive (고 있어요)
교체하고 있어요
gyoh-chae-hah-goh ee-ssuh-yoh
gyochehago isseoyo
Want to (고 싶어요)
교체하고 싶어요
gyoh-chae-hah-goh shee-puh-yoh
gyochehago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
교체할 수 있어요
gyoh-chae-hahl soo ee-ssuh-yoh
gyochehal su isseoyo
Because / So (아/어서)
교체해서
gyoh-chae-hae-suh
gyochehaeseo
Noun form — (기)
교체하기
gyoh-chae-hah-gee
gyochehagi
Noun form — (음)
교체함
gyoh-chae-hahm
gyocheham