Verbseoul.
하다 verb
선언하다seoneonhadato declare

To say to declare politely in the present tense, use 선언해요 (suh-nuhn-hae-yoh). Below is the full conjugation of 선언하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
선언해
suh-nuhn-hae
선언해요
suh-nuhn-hae-yoh
선언합니다
suh-nuhn-hahm-nee-dah
Past
선언했어
suh-nuhn-hae-ssuh
선언했어요
suh-nuhn-hae-ssuh-yoh
선언했습니다
suh-nuhn-hae-sseum-nee-dah
Future
선언할 거야
suh-nuhn-hahl- -guh-yah
선언할 거예요
suh-nuhn-hahl- -guh-yae-yoh
선언할 겁니다
suh-nuhn-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
선언하세요
suh-nuhn-hah-sae-yoh
Suggestion / Let's Polite (요)
선언해요
suh-nuhn-hae-yoh
Question Polite (요)
선언해요?
suh-nuhn-hae-yoh-?
Connective “and” — (고)
선언하고
suh-nuhn-hah-goh
Conditional “if” — (면)
선언하면
suh-nuhn-hah-myuhn
Noun form — (기)
선언함
suh-nuhn-hahm