Verbseoul.
하다 verb
경악하다gyeongakhadato become astonished

To say to become astonished politely in the present tense, use 경악해요 (gyuhng-ah-kae-yoh). Below is the full conjugation of 경악하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
경악해
gyuhng-ah-kae
경악해요
gyuhng-ah-kae-yoh
경악합니다
gyuhng-ah-kahm-nee-dah
Past
경악했어
gyuhng-ah-kae-ssuh
경악했어요
gyuhng-ah-kae-ssuh-yoh
경악했습니다
gyuhng-ah-kae-sseum-nee-dah
Future
경악할 거야
gyuhng-ah-kahl- -guh-yah
경악할 거예요
gyuhng-ah-kahl- -guh-yae-yoh
경악할 겁니다
gyuhng-ah-kahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
경악하세요
gyuhng-ah-kah-sae-yoh
Suggestion / Let's Polite (요)
경악해요
gyuhng-ah-kae-yoh
Question Polite (요)
경악해요?
gyuhng-ah-kae-yoh-?
Connective “and” — (고)
경악하고
gyuhng-ah-kah-goh
Conditional “if” — (면)
경악하면
gyuhng-ah-kah-myuhn
Noun form — (기)
경악함
gyuhng-ah-kahm