Verbseoul.
하다 verb
증설하다jeungseolhadato extend or add installations

To say to extend or add installations politely in the present tense, use 증설해요 (cheung-suhl-hae-yoh). Below is the full conjugation of 증설하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
증설해
cheung-suhl-hae
증설해요
cheung-suhl-hae-yoh
증설합니다
cheung-suhl-hahm-nee-dah
Past
증설했어
cheung-suhl-hae-ssuh
증설했어요
cheung-suhl-hae-ssuh-yoh
증설했습니다
cheung-suhl-hae-sseum-nee-dah
Future
증설할 거야
cheung-suhl-hahl- -guh-yah
증설할 거예요
cheung-suhl-hahl- -guh-yae-yoh
증설할 겁니다
cheung-suhl-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
증설하세요
cheung-suhl-hah-sae-yoh
Suggestion / Let's Polite (요)
증설해요
cheung-suhl-hae-yoh
Question Polite (요)
증설해요?
cheung-suhl-hae-yoh-?
Connective “and” — (고)
증설하고
cheung-suhl-hah-goh
Conditional “if” — (면)
증설하면
cheung-suhl-hah-myuhn
Noun form — (기)
증설함
cheung-suhl-hahm