Verbseoul.
하다 verb
참여하다chamyeohadato participate

To say to participate politely in the present tense, use 참여해요 (chah-myuh-hae-yoh). Below is the full conjugation of 참여하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
참여해
chah-myuh-hae
참여해요
chah-myuh-hae-yoh
참여합니다
chah-myuh-hahm-nee-dah
Past
참여했어
chah-myuh-hae-ssuh
참여했어요
chah-myuh-hae-ssuh-yoh
참여했습니다
chah-myuh-hae-sseum-nee-dah
Future
참여할 거야
chah-myuh-hahl- -guh-yah
참여할 거예요
chah-myuh-hahl- -guh-yae-yoh
참여할 겁니다
chah-myuh-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
참여하세요
chah-myuh-hah-sae-yoh
Suggestion / Let's Polite (요)
참여해요
chah-myuh-hae-yoh
Question Polite (요)
참여해요?
chah-myuh-hae-yoh-?
Connective “and” — (고)
참여하고
chah-myuh-hah-goh
Conditional “if” — (면)
참여하면
chah-myuh-hah-myuhn
Noun form — (기)
참여함
chah-myuh-hahm