Verbseoul.
descriptive
세다sedato be strong

To say to be strong politely in the present tense, use 세요 (sae-yoh). Below is the full conjugation of 세다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
sae
세요
sae-yoh
셉니다
saem-nee-dah
Past
셌어
sae-ssuh
셌어요
sae-ssuh-yoh
셌습니다
sae-sseum-nee-dah
Future
셀 거야
sael- -guh-yah
셀 거예요
sael- -guh-yae-yoh
셀 겁니다
sael- -guhm-nee-dah

Other useful forms

Command Polite (세요)
세세요
sae-sae-yoh
Suggestion / Let's Polite (요)
세요
sae-yoh
Question Polite (요)
세요?
sae-yoh-?
Connective “and” — (고)
세고
sae-goh
Conditional “if” — (면)
세면
sae-myuhn
Noun form — (기)
saem