Verbseoul.
하다 verb
연결하다yeongyeolhadato 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). Below is the full conjugation of 연결하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
연결해
yuhn-gyuhl-hae
연결해요
yuhn-gyuhl-hae-yoh
연결합니다
yuhn-gyuhl-hahm-nee-dah
Past
연결했어
yuhn-gyuhl-hae-ssuh
연결했어요
yuhn-gyuhl-hae-ssuh-yoh
연결했습니다
yuhn-gyuhl-hae-sseum-nee-dah
Future
연결할 거야
yuhn-gyuhl-hahl- -guh-yah
연결할 거예요
yuhn-gyuhl-hahl- -guh-yae-yoh
연결할 겁니다
yuhn-gyuhl-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
연결하세요
yuhn-gyuhl-hah-sae-yoh
Suggestion / Let's Polite (요)
연결해요
yuhn-gyuhl-hae-yoh
Question Polite (요)
연결해요?
yuhn-gyuhl-hae-yoh-?
Connective “and” — (고)
연결하고
yuhn-gyuhl-hah-goh
Conditional “if” — (면)
연결하면
yuhn-gyuhl-hah-myuhn
Noun form — (기)
연결함
yuhn-gyuhl-hahm