Verbseoul.
regular
들끓다deulkkeuldato swarm, to gather, to infest

To say to swarm, to gather, to infest politely in the present tense, use 들끓어요 (deul-ggeu-ruh-yoh). Below is the full conjugation of 들끓다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
들끓어
deul-ggeu-ruh
들끓어요
deul-ggeu-ruh-yoh
들끓습니다
deul-ggeul-seum-nee-dah
Past
들끓었어
deul-ggeu-ruh-ssuh
들끓었어요
deul-ggeu-ruh-ssuh-yoh
들끓었습니다
deul-ggeu-ruh-sseum-nee-dah
Future
들끓을 거야
deul-ggeu-reul- -guh-yah
들끓을 거예요
deul-ggeu-reul- -guh-yae-yoh
들끓을 겁니다
deul-ggeu-reul- -guhm-nee-dah

Other useful forms

Command Polite (세요)
들끓으세요
deul-ggeu-reu-sae-yoh
Suggestion / Let's Polite (요)
들끓어요
deul-ggeu-ruh-yoh
Question Polite (요)
들끓어요?
deul-ggeu-ruh-yoh-?
Connective “and” — (고)
들끓고
deul-ggeul-goh
Conditional “if” — (면)
들끓으면
deul-ggeu-reu-myuhn
Noun form — (기)
들끓음
deul-ggeu-reum