Verbseoul.
descriptive
시다sidato be sour

To say to be sour politely in the present tense, use 셔요 (syuh-yoh). Below is the full conjugation of 시다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
syuh
셔요
syuh-yoh
십니다
sheem-nee-dah
Past
셨어
syuh-ssuh
셨어요
syuh-ssuh-yoh
셨습니다
syuh-sseum-nee-dah
Future
실 거야
sheel- -guh-yah
실 거예요
sheel- -guh-yae-yoh
실 겁니다
sheel- -guhm-nee-dah

Other useful forms

Command Polite (세요)
시세요
shee-sae-yoh
Suggestion / Let's Polite (요)
셔요
syuh-yoh
Question Polite (요)
셔요?
syuh-yoh-?
Connective “and” — (고)
시고
shee-goh
Conditional “if” — (면)
시면
shee-myuhn
Noun form — (기)
sheem