Verbseoul.
regular
앞서다apseodato precede, to come before

To say to precede, to come before politely in the present tense, use 앞서요 (ahp-ssuh-yoh). Below is the full conjugation of 앞서다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
앞서
ahp-ssuh
앞서요
ahp-ssuh-yoh
앞섭니다
ahp-ssuhm-nee-dah
Past
앞섰어
ahp-ssuh-ssuh
앞섰어요
ahp-ssuh-ssuh-yoh
앞섰습니다
ahp-ssuh-sseum-nee-dah
Future
앞설 거야
ahp-ssuhl- -guh-yah
앞설 거예요
ahp-ssuhl- -guh-yae-yoh
앞설 겁니다
ahp-ssuhl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
앞서세요
ahp-ssuh-sae-yoh
Suggestion / Let's Polite (요)
앞서요
ahp-ssuh-yoh
Question Polite (요)
앞서요?
ahp-ssuh-yoh-?
Connective “and” — (고)
앞서고
ahp-ssuh-goh
Conditional “if” — (면)
앞서면
ahp-ssuh-myuhn
Noun form — (기)
앞섬
ahp-ssuhm