Verbseoul.
하다 verb

연결하다 conjugation (yeongyeolhada, to connect, to join, to attach, to link)

To say to connect, to join, to attach, to link politely in the present tense, use 연결해요 (yuhn-gyuhl-hae-yoh) · yeongyeolhaeyo. Below is the full conjugation of 연결하다 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
연결해
yuhn-gyuhl-hae
yeongyeolhae
연결해요
yuhn-gyuhl-hae-yoh
yeongyeolhaeyo
연결합니다
yuhn-gyuhl-hahm-nee-dah
yeongyeolhamnida
Past
연결했어
yuhn-gyuhl-hae-ssuh
yeongyeolhaesseo
연결했어요
yuhn-gyuhl-hae-ssuh-yoh
yeongyeolhaesseoyo
연결했습니다
yuhn-gyuhl-hae-sseum-nee-dah
yeongyeolhaesseumnida
Future
연결할 거야
yuhn-gyuhl-hahl guh-yah
yeongyeolhal geoya
연결할 거예요
yuhn-gyuhl-hahl guh-yae-yoh
yeongyeolhal geoyeyo
연결할 겁니다
yuhn-gyuhl-hahl guhm-nee-dah
yeongyeolhal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
연결하세요
yuhn-gyuhl-hah-sae-yoh
yeongyeolhaseyo
Suggestion / Let's Polite (요)
연결해요
yuhn-gyuhl-hae-yoh
yeongyeolhaeyo
Question Polite (요)
연결해요?
yuhn-gyuhl-hae-yoh-?
yeongyeolhaeyo?
Connective "and" — (고)
연결하고
yuhn-gyuhl-hah-goh
yeongyeolhago
Conditional "if" — (면)
연결하면
yuhn-gyuhl-hah-myuhn
yeongyeolhamyeon
Progressive (고 있어요)
연결하고 있어요
yuhn-gyuhl-hah-goh ee-ssuh-yoh
yeongyeolhago isseoyo
Want to (고 싶어요)
연결하고 싶어요
yuhn-gyuhl-hah-goh shee-puh-yoh
yeongyeolhago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
연결할 수 있어요
yuhn-gyuhl-hahl soo ee-ssuh-yoh
yeongyeolhal su isseoyo
Because / So (아/어서)
연결해서
yuhn-gyuhl-hae-suh
yeongyeolhaeseo
Noun form — (기)
연결하기
yuhn-gyuhl-hah-gee
yeongyeolhagi
Noun form — (음)
연결함
yuhn-gyuhl-hahm
yeongyeolham