Verbseoul.
하다 verb (adj)
다행하다dahaenghadato be fortunate

To say to be fortunate politely in the present tense, use 다행해요 (dah-haeng-hae-yoh). Below is the full conjugation of 다행하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
다행해
dah-haeng-hae
다행해요
dah-haeng-hae-yoh
다행합니다
dah-haeng-hahm-nee-dah
Past
다행했어
dah-haeng-hae-ssuh
다행했어요
dah-haeng-hae-ssuh-yoh
다행했습니다
dah-haeng-hae-sseum-nee-dah
Future
다행할 거야
dah-haeng-hahl- -guh-yah
다행할 거예요
dah-haeng-hahl- -guh-yae-yoh
다행할 겁니다
dah-haeng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
다행하세요
dah-haeng-hah-sae-yoh
Suggestion / Let's Polite (요)
다행해요
dah-haeng-hae-yoh
Question Polite (요)
다행해요?
dah-haeng-hae-yoh-?
Connective “and” — (고)
다행하고
dah-haeng-hah-goh
Conditional “if” — (면)
다행하면
dah-haeng-hah-myuhn
Noun form — (기)
다행함
dah-haeng-hahm