Verbseoul.
하다 verb (adj)
깨끗하다kkaekkeuthadato be clean

To say to be clean politely in the present tense, use 깨끗해요 (ggae-ggeu-tae-yoh). Below is the full conjugation of 깨끗하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
깨끗해
ggae-ggeu-tae
깨끗해요
ggae-ggeu-tae-yoh
깨끗합니다
ggae-ggeu-tahm-nee-dah
Past
깨끗했어
ggae-ggeu-tae-ssuh
깨끗했어요
ggae-ggeu-tae-ssuh-yoh
깨끗했습니다
ggae-ggeu-tae-sseum-nee-dah
Future
깨끗할 거야
ggae-ggeu-tahl- -guh-yah
깨끗할 거예요
ggae-ggeu-tahl- -guh-yae-yoh
깨끗할 겁니다
ggae-ggeu-tahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
깨끗하세요
ggae-ggeu-tah-sae-yoh
Suggestion / Let's Polite (요)
깨끗해요
ggae-ggeu-tae-yoh
Question Polite (요)
깨끗해요?
ggae-ggeu-tae-yoh-?
Connective “and” — (고)
깨끗하고
ggae-ggeu-tah-goh
Conditional “if” — (면)
깨끗하면
ggae-ggeu-tah-myuhn
Noun form — (기)
깨끗함
ggae-ggeu-tahm