Verbseoul.
하다 verb
금지하다geumjihadato forbid

To say to forbid politely in the present tense, use 금지해요 (geum-chee-hae-yoh). Below is the full conjugation of 금지하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
금지해
geum-chee-hae
금지해요
geum-chee-hae-yoh
금지합니다
geum-chee-hahm-nee-dah
Past
금지했어
geum-chee-hae-ssuh
금지했어요
geum-chee-hae-ssuh-yoh
금지했습니다
geum-chee-hae-sseum-nee-dah
Future
금지할 거야
geum-chee-hahl- -guh-yah
금지할 거예요
geum-chee-hahl- -guh-yae-yoh
금지할 겁니다
geum-chee-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
금지하세요
geum-chee-hah-sae-yoh
Suggestion / Let's Polite (요)
금지해요
geum-chee-hae-yoh
Question Polite (요)
금지해요?
geum-chee-hae-yoh-?
Connective “and” — (고)
금지하고
geum-chee-hah-goh
Conditional “if” — (면)
금지하면
geum-chee-hah-myuhn
Noun form — (기)
금지함
geum-chee-hahm