Verbseoul.
하다 verb
건설하다geonseolhadato build, to construct

To say to build, to construct politely in the present tense, use 건설해요 (guhn-suhl-hae-yoh). Below is the full conjugation of 건설하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
건설해
guhn-suhl-hae
건설해요
guhn-suhl-hae-yoh
건설합니다
guhn-suhl-hahm-nee-dah
Past
건설했어
guhn-suhl-hae-ssuh
건설했어요
guhn-suhl-hae-ssuh-yoh
건설했습니다
guhn-suhl-hae-sseum-nee-dah
Future
건설할 거야
guhn-suhl-hahl- -guh-yah
건설할 거예요
guhn-suhl-hahl- -guh-yae-yoh
건설할 겁니다
guhn-suhl-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
건설하세요
guhn-suhl-hah-sae-yoh
Suggestion / Let's Polite (요)
건설해요
guhn-suhl-hae-yoh
Question Polite (요)
건설해요?
guhn-suhl-hae-yoh-?
Connective “and” — (고)
건설하고
guhn-suhl-hah-goh
Conditional “if” — (면)
건설하면
guhn-suhl-hah-myuhn
Noun form — (기)
건설함
guhn-suhl-hahm