Verbseoul.
하다 verb
변하다byeonhadato change

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

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
변해
byuhn-hae
변해요
byuhn-hae-yoh
변합니다
byuhn-hahm-nee-dah
Past
변했어
byuhn-hae-ssuh
변했어요
byuhn-hae-ssuh-yoh
변했습니다
byuhn-hae-sseum-nee-dah
Future
변할 거야
byuhn-hahl- -guh-yah
변할 거예요
byuhn-hahl- -guh-yae-yoh
변할 겁니다
byuhn-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
변하세요
byuhn-hah-sae-yoh
Suggestion / Let's Polite (요)
변해요
byuhn-hae-yoh
Question Polite (요)
변해요?
byuhn-hae-yoh-?
Connective “and” — (고)
변하고
byuhn-hah-goh
Conditional “if” — (면)
변하면
byuhn-hah-myuhn
Noun form — (기)
변함
byuhn-hahm