Verbseoul.
하다 verb
교환하다gyohwanhadato exchange

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

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
교환해
gyoh-hwahn-hae
교환해요
gyoh-hwahn-hae-yoh
교환합니다
gyoh-hwahn-hahm-nee-dah
Past
교환했어
gyoh-hwahn-hae-ssuh
교환했어요
gyoh-hwahn-hae-ssuh-yoh
교환했습니다
gyoh-hwahn-hae-sseum-nee-dah
Future
교환할 거야
gyoh-hwahn-hahl- -guh-yah
교환할 거예요
gyoh-hwahn-hahl- -guh-yae-yoh
교환할 겁니다
gyoh-hwahn-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
교환하세요
gyoh-hwahn-hah-sae-yoh
Suggestion / Let's Polite (요)
교환해요
gyoh-hwahn-hae-yoh
Question Polite (요)
교환해요?
gyoh-hwahn-hae-yoh-?
Connective “and” — (고)
교환하고
gyoh-hwahn-hah-goh
Conditional “if” — (면)
교환하면
gyoh-hwahn-hah-myuhn
Noun form — (기)
교환함
gyoh-hwahn-hahm