Verbseoul.
으 irregular
잠그다jamgeudato lock (door, lock), to turn off (valve, tap, gas)

To say to lock (door, lock), to turn off (valve, tap, gas) politely in the present tense, use 잠가요 (chahm-gah-yoh). Below is the full conjugation of 잠그다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
잠가
chahm-gah
잠가요
chahm-gah-yoh
잠급니다
chahm-geum-nee-dah
Past
잠갔어
chahm-gah-ssuh
잠갔어요
chahm-gah-ssuh-yoh
잠갔습니다
chahm-gah-sseum-nee-dah
Future
잠글 거야
chahm-geul- -guh-yah
잠글 거예요
chahm-geul- -guh-yae-yoh
잠글 겁니다
chahm-geul- -guhm-nee-dah

Other useful forms

Command Polite (세요)
잠그세요
chahm-geu-sae-yoh
Suggestion / Let's Polite (요)
잠가요
chahm-gah-yoh
Question Polite (요)
잠가요?
chahm-gah-yoh-?
Connective “and” — (고)
잠그고
chahm-geu-goh
Conditional “if” — (면)
잠그면
chahm-geu-myuhn
Noun form — (기)
잠금
chahm-geum