Verbseoul.
하다 verb
정하다jeonghadato designate, to specify, to decide, to determine

To say to designate, to specify, to decide, to determine politely in the present tense, use 정해요 (chuhng-hae-yoh). Below is the full conjugation of 정하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
정해
chuhng-hae
정해요
chuhng-hae-yoh
정합니다
chuhng-hahm-nee-dah
Past
정했어
chuhng-hae-ssuh
정했어요
chuhng-hae-ssuh-yoh
정했습니다
chuhng-hae-sseum-nee-dah
Future
정할 거야
chuhng-hahl- -guh-yah
정할 거예요
chuhng-hahl- -guh-yae-yoh
정할 겁니다
chuhng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
정하세요
chuhng-hah-sae-yoh
Suggestion / Let's Polite (요)
정해요
chuhng-hae-yoh
Question Polite (요)
정해요?
chuhng-hae-yoh-?
Connective “and” — (고)
정하고
chuhng-hah-goh
Conditional “if” — (면)
정하면
chuhng-hah-myuhn
Noun form — (기)
정함
chuhng-hahm