Verbseoul.
regular
끓다kkeulda-2to boil

To say to boil politely in the present tense, use 끓어요 (ggeu-ruh-yoh). Below is the full conjugation of 끓다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
끓어
ggeu-ruh
끓어요
ggeu-ruh-yoh
끓습니다
ggeul-seum-nee-dah
Past
끓었어
ggeu-ruh-ssuh
끓었어요
ggeu-ruh-ssuh-yoh
끓었습니다
ggeu-ruh-sseum-nee-dah
Future
끓을 거야
ggeu-reul- -guh-yah
끓을 거예요
ggeu-reul- -guh-yae-yoh
끓을 겁니다
ggeu-reul- -guhm-nee-dah

Other useful forms

Command Polite (세요)
끓으세요
ggeu-reu-sae-yoh
Suggestion / Let's Polite (요)
끓어요
ggeu-ruh-yoh
Question Polite (요)
끓어요?
ggeu-ruh-yoh-?
Connective “and” — (고)
끓고
ggeul-goh
Conditional “if” — (면)
끓으면
ggeu-reu-myuhn
Noun form — (기)
끓음
ggeu-reum