Verbseoul.
하다 verb
교체하다gyochehadato change

To say to change politely in the present tense, use 교체해요 (gyoh-chae-hae-yoh). Below is the full conjugation of 교체하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
교체해
gyoh-chae-hae
교체해요
gyoh-chae-hae-yoh
교체합니다
gyoh-chae-hahm-nee-dah
Past
교체했어
gyoh-chae-hae-ssuh
교체했어요
gyoh-chae-hae-ssuh-yoh
교체했습니다
gyoh-chae-hae-sseum-nee-dah
Future
교체할 거야
gyoh-chae-hahl- -guh-yah
교체할 거예요
gyoh-chae-hahl- -guh-yae-yoh
교체할 겁니다
gyoh-chae-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
교체하세요
gyoh-chae-hah-sae-yoh
Suggestion / Let's Polite (요)
교체해요
gyoh-chae-hae-yoh
Question Polite (요)
교체해요?
gyoh-chae-hae-yoh-?
Connective “and” — (고)
교체하고
gyoh-chae-hah-goh
Conditional “if” — (면)
교체하면
gyoh-chae-hah-myuhn
Noun form — (기)
교체함
gyoh-chae-hahm