Verbseoul.
하다 verb

건설하다 conjugation (geonseolhada, to build, to construct)

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

Grammar note (하다 verb): 하다 verbs are formed with a Sino-Korean noun + 하다 (e.g. 공부하다 = study + do). 하다 conjugates irregularly: the ㅏ in 하 contracts with the -아/-어 suffix to give 해 (not *하어). Present polite: 해요; past polite: 했어요. The formal ending is 합니다 (not *하습니다). Most noun+하다 compounds follow this pattern uniformly. See all 하다 verbs →

Conjugation table

pron. = pronunciation guide  · RR = Revised Romanization

Highlighted = where the stem changes

TenseCasual (반말)Polite (요)Formal (합니다)
Present
건설해
guhn-suhl-hae
geonseolhae
건설해요
guhn-suhl-hae-yoh
geonseolhaeyo
건설합니다
guhn-suhl-hahm-nee-dah
geonseolhamnida
Past
건설했어
guhn-suhl-hae-ssuh
geonseolhaesseo
건설했어요
guhn-suhl-hae-ssuh-yoh
geonseolhaesseoyo
건설했습니다
guhn-suhl-hae-sseum-nee-dah
geonseolhaesseumnida
Future
건설할 거야
guhn-suhl-hahl guh-yah
geonseolhal geoya
건설할 거예요
guhn-suhl-hahl guh-yae-yoh
geonseolhal geoyeyo
건설할 겁니다
guhn-suhl-hahl guhm-nee-dah
geonseolhal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
건설하세요
guhn-suhl-hah-sae-yoh
geonseolhaseyo
Suggestion / Let's Polite (요)
건설해요
guhn-suhl-hae-yoh
geonseolhaeyo
Question Polite (요)
건설해요?
guhn-suhl-hae-yoh-?
geonseolhaeyo?
Connective "and" — (고)
건설하고
guhn-suhl-hah-goh
geonseolhago
Conditional "if" — (면)
건설하면
guhn-suhl-hah-myuhn
geonseolhamyeon
Progressive (고 있어요)
건설하고 있어요
guhn-suhl-hah-goh ee-ssuh-yoh
geonseolhago isseoyo
Want to (고 싶어요)
건설하고 싶어요
guhn-suhl-hah-goh shee-puh-yoh
geonseolhago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
건설할 수 있어요
guhn-suhl-hahl soo ee-ssuh-yoh
geonseolhal su isseoyo
Because / So (아/어서)
건설해서
guhn-suhl-hae-suh
geonseolhaeseo
Noun form — (기)
건설하기
guhn-suhl-hah-gee
geonseolhagi
Noun form — (음)
건설함
guhn-suhl-hahm
geonseolham