Verbseoul.
하다 verb
자진하다jajinhadato volunteer (oneself)

To say to volunteer (oneself) politely in the present tense, use 자진해요 (chah-cheen-hae-yoh). Below is the full conjugation of 자진하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
자진해
chah-cheen-hae
자진해요
chah-cheen-hae-yoh
자진합니다
chah-cheen-hahm-nee-dah
Past
자진했어
chah-cheen-hae-ssuh
자진했어요
chah-cheen-hae-ssuh-yoh
자진했습니다
chah-cheen-hae-sseum-nee-dah
Future
자진할 거야
chah-cheen-hahl- -guh-yah
자진할 거예요
chah-cheen-hahl- -guh-yae-yoh
자진할 겁니다
chah-cheen-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
자진하세요
chah-cheen-hah-sae-yoh
Suggestion / Let's Polite (요)
자진해요
chah-cheen-hae-yoh
Question Polite (요)
자진해요?
chah-cheen-hae-yoh-?
Connective “and” — (고)
자진하고
chah-cheen-hah-goh
Conditional “if” — (면)
자진하면
chah-cheen-hah-myuhn
Noun form — (기)
자진함
chah-cheen-hahm