Verbseoul.
하다 verb
완성하다wanseonghadato complete, to finish

To say to complete, to finish politely in the present tense, use 완성해요 (wahn-suhng-hae-yoh). Below is the full conjugation of 완성하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
완성해
wahn-suhng-hae
완성해요
wahn-suhng-hae-yoh
완성합니다
wahn-suhng-hahm-nee-dah
Past
완성했어
wahn-suhng-hae-ssuh
완성했어요
wahn-suhng-hae-ssuh-yoh
완성했습니다
wahn-suhng-hae-sseum-nee-dah
Future
완성할 거야
wahn-suhng-hahl- -guh-yah
완성할 거예요
wahn-suhng-hahl- -guh-yae-yoh
완성할 겁니다
wahn-suhng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
완성하세요
wahn-suhng-hah-sae-yoh
Suggestion / Let's Polite (요)
완성해요
wahn-suhng-hae-yoh
Question Polite (요)
완성해요?
wahn-suhng-hae-yoh-?
Connective “and” — (고)
완성하고
wahn-suhng-hah-goh
Conditional “if” — (면)
완성하면
wahn-suhng-hah-myuhn
Noun form — (기)
완성함
wahn-suhng-hahm