Verbseoul.
하다 verb
사망하다samanghadato die

To say to die politely in the present tense, use 사망해요 (sah-mahng-hae-yoh). Below is the full conjugation of 사망하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
사망해
sah-mahng-hae
사망해요
sah-mahng-hae-yoh
사망합니다
sah-mahng-hahm-nee-dah
Past
사망했어
sah-mahng-hae-ssuh
사망했어요
sah-mahng-hae-ssuh-yoh
사망했습니다
sah-mahng-hae-sseum-nee-dah
Future
사망할 거야
sah-mahng-hahl- -guh-yah
사망할 거예요
sah-mahng-hahl- -guh-yae-yoh
사망할 겁니다
sah-mahng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
사망하세요
sah-mahng-hah-sae-yoh
Suggestion / Let's Polite (요)
사망해요
sah-mahng-hae-yoh
Question Polite (요)
사망해요?
sah-mahng-hae-yoh-?
Connective “and” — (고)
사망하고
sah-mahng-hah-goh
Conditional “if” — (면)
사망하면
sah-mahng-hah-myuhn
Noun form — (기)
사망함
sah-mahng-hahm