Verbseoul.
하다 verb
찬성하다chanseonghadato agree, to assent

To say to agree, to assent politely in the present tense, use 찬성해요 (chahn-suhng-hae-yoh). Below is the full conjugation of 찬성하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
찬성해
chahn-suhng-hae
찬성해요
chahn-suhng-hae-yoh
찬성합니다
chahn-suhng-hahm-nee-dah
Past
찬성했어
chahn-suhng-hae-ssuh
찬성했어요
chahn-suhng-hae-ssuh-yoh
찬성했습니다
chahn-suhng-hae-sseum-nee-dah
Future
찬성할 거야
chahn-suhng-hahl- -guh-yah
찬성할 거예요
chahn-suhng-hahl- -guh-yae-yoh
찬성할 겁니다
chahn-suhng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
찬성하세요
chahn-suhng-hah-sae-yoh
Suggestion / Let's Polite (요)
찬성해요
chahn-suhng-hae-yoh
Question Polite (요)
찬성해요?
chahn-suhng-hae-yoh-?
Connective “and” — (고)
찬성하고
chahn-suhng-hah-goh
Conditional “if” — (면)
찬성하면
chahn-suhng-hah-myuhn
Noun form — (기)
찬성함
chahn-suhng-hahm