Verbseoul.
하다 verb
기여하다giyeohadato contribute

To say to contribute politely in the present tense, use 기여해요 (gee-yuh-hae-yoh). Below is the full conjugation of 기여하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
기여해
gee-yuh-hae
기여해요
gee-yuh-hae-yoh
기여합니다
gee-yuh-hahm-nee-dah
Past
기여했어
gee-yuh-hae-ssuh
기여했어요
gee-yuh-hae-ssuh-yoh
기여했습니다
gee-yuh-hae-sseum-nee-dah
Future
기여할 거야
gee-yuh-hahl- -guh-yah
기여할 거예요
gee-yuh-hahl- -guh-yae-yoh
기여할 겁니다
gee-yuh-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
기여하세요
gee-yuh-hah-sae-yoh
Suggestion / Let's Polite (요)
기여해요
gee-yuh-hae-yoh
Question Polite (요)
기여해요?
gee-yuh-hae-yoh-?
Connective “and” — (고)
기여하고
gee-yuh-hah-goh
Conditional “if” — (면)
기여하면
gee-yuh-hah-myuhn
Noun form — (기)
기여함
gee-yuh-hahm