Verbseoul.
하다 verb (adj)
미안하다mianhadato be ashamed of oneself

To say to be ashamed of oneself politely in the present tense, use 미안해요 (mee-ahn-hae-yoh). Below is the full conjugation of 미안하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
미안해
mee-ahn-hae
미안해요
mee-ahn-hae-yoh
미안합니다
mee-ahn-hahm-nee-dah
Past
미안했어
mee-ahn-hae-ssuh
미안했어요
mee-ahn-hae-ssuh-yoh
미안했습니다
mee-ahn-hae-sseum-nee-dah
Future
미안할 거야
mee-ahn-hahl- -guh-yah
미안할 거예요
mee-ahn-hahl- -guh-yae-yoh
미안할 겁니다
mee-ahn-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
미안하세요
mee-ahn-hah-sae-yoh
Suggestion / Let's Polite (요)
미안해요
mee-ahn-hae-yoh
Question Polite (요)
미안해요?
mee-ahn-hae-yoh-?
Connective “and” — (고)
미안하고
mee-ahn-hah-goh
Conditional “if” — (면)
미안하면
mee-ahn-hah-myuhn
Noun form — (기)
미안함
mee-ahn-hahm