Verbseoul.
하다 verb
한탄하다hantanhadato lament, to deplore, to regret

To say to lament, to deplore, to regret politely in the present tense, use 한탄해요 (hahn-tahn-hae-yoh). Below is the full conjugation of 한탄하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
한탄해
hahn-tahn-hae
한탄해요
hahn-tahn-hae-yoh
한탄합니다
hahn-tahn-hahm-nee-dah
Past
한탄했어
hahn-tahn-hae-ssuh
한탄했어요
hahn-tahn-hae-ssuh-yoh
한탄했습니다
hahn-tahn-hae-sseum-nee-dah
Future
한탄할 거야
hahn-tahn-hahl- -guh-yah
한탄할 거예요
hahn-tahn-hahl- -guh-yae-yoh
한탄할 겁니다
hahn-tahn-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
한탄하세요
hahn-tahn-hah-sae-yoh
Suggestion / Let's Polite (요)
한탄해요
hahn-tahn-hae-yoh
Question Polite (요)
한탄해요?
hahn-tahn-hae-yoh-?
Connective “and” — (고)
한탄하고
hahn-tahn-hah-goh
Conditional “if” — (면)
한탄하면
hahn-tahn-hah-myuhn
Noun form — (기)
한탄함
hahn-tahn-hahm