Verbseoul.
하다 verb (adj)
새콤하다saekomhadato be sourish, vinegarish

To say to be sourish, vinegarish politely in the present tense, use 새콤해요 (sae-kohm-hae-yoh). Below is the full conjugation of 새콤하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
새콤해
sae-kohm-hae
새콤해요
sae-kohm-hae-yoh
새콤합니다
sae-kohm-hahm-nee-dah
Past
새콤했어
sae-kohm-hae-ssuh
새콤했어요
sae-kohm-hae-ssuh-yoh
새콤했습니다
sae-kohm-hae-sseum-nee-dah
Future
새콤할 거야
sae-kohm-hahl- -guh-yah
새콤할 거예요
sae-kohm-hahl- -guh-yae-yoh
새콤할 겁니다
sae-kohm-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
새콤하세요
sae-kohm-hah-sae-yoh
Suggestion / Let's Polite (요)
새콤해요
sae-kohm-hae-yoh
Question Polite (요)
새콤해요?
sae-kohm-hae-yoh-?
Connective “and” — (고)
새콤하고
sae-kohm-hah-goh
Conditional “if” — (면)
새콤하면
sae-kohm-hah-myuhn
Noun form — (기)
새콤함
sae-kohm-hahm