Verbseoul.
하다 verb
공사하다gongsahadato do construction work

To say to do construction work politely in the present tense, use 공사해요 (gohng-sah-hae-yoh). Below is the full conjugation of 공사하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
공사해
gohng-sah-hae
공사해요
gohng-sah-hae-yoh
공사합니다
gohng-sah-hahm-nee-dah
Past
공사했어
gohng-sah-hae-ssuh
공사했어요
gohng-sah-hae-ssuh-yoh
공사했습니다
gohng-sah-hae-sseum-nee-dah
Future
공사할 거야
gohng-sah-hahl- -guh-yah
공사할 거예요
gohng-sah-hahl- -guh-yae-yoh
공사할 겁니다
gohng-sah-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
공사하세요
gohng-sah-hah-sae-yoh
Suggestion / Let's Polite (요)
공사해요
gohng-sah-hae-yoh
Question Polite (요)
공사해요?
gohng-sah-hae-yoh-?
Connective “and” — (고)
공사하고
gohng-sah-hah-goh
Conditional “if” — (면)
공사하면
gohng-sah-hah-myuhn
Noun form — (기)
공사함
gohng-sah-hahm