Verbseoul.
ㅂ irregular (adj)
어둡다eodupdadark

To say dark politely in the present tense, use 어두워요 (uh-doo-wuh-yoh). Below is the full conjugation of 어둡다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
어두워
uh-doo-wuh
어두워요
uh-doo-wuh-yoh
어둡습니다
uh-doop-sseum-nee-dah
Past
어두웠어
uh-doo-wuh-ssuh
어두웠어요
uh-doo-wuh-ssuh-yoh
어두웠습니다
uh-doo-wuh-sseum-nee-dah
Future
어두울 거야
uh-doo-ool- -guh-yah
어두울 거예요
uh-doo-ool- -guh-yae-yoh
어두울 겁니다
uh-doo-ool- -guhm-nee-dah

Other useful forms

Command Polite (세요)
어두우세요
uh-doo-oo-sae-yoh
Suggestion / Let's Polite (요)
어두워요
uh-doo-wuh-yoh
Question Polite (요)
어두워요?
uh-doo-wuh-yoh-?
Connective “and” — (고)
어둡고
uh-doop-goh
Conditional “if” — (면)
어두우면
uh-doo-oo-myuhn
Noun form — (기)
어두움
uh-doo-oom