Verbseoul.
regular
값나가다gapnagadavaluable, expensive

To say valuable, expensive politely in the present tense, use 값나가요 (gahp-nah-gah-yoh). Below is the full conjugation of 값나가다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
값나가
gahp-nah-gah
값나가요
gahp-nah-gah-yoh
값나갑니다
gahp-nah-gahm-nee-dah
Past
값나갔어
gahp-nah-gah-ssuh
값나갔어요
gahp-nah-gah-ssuh-yoh
값나갔습니다
gahp-nah-gah-sseum-nee-dah
Future
값나갈 거야
gahp-nah-gahl- -guh-yah
값나갈 거예요
gahp-nah-gahl- -guh-yae-yoh
값나갈 겁니다
gahp-nah-gahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
값나가세요
gahp-nah-gah-sae-yoh
Suggestion / Let's Polite (요)
값나가요
gahp-nah-gah-yoh
Question Polite (요)
값나가요?
gahp-nah-gah-yoh-?
Connective “and” — (고)
값나가고
gahp-nah-gah-goh
Conditional “if” — (면)
값나가면
gahp-nah-gah-myuhn
Noun form — (기)
값나감
gahp-nah-gahm