Verbseoul.
하다 verb
협박하다hyeopbakhadato threaten, to menace

To say to threaten, to menace politely in the present tense, use 협박해요 (hyuhp-bah-kae-yoh). Below is the full conjugation of 협박하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
협박해
hyuhp-bah-kae
협박해요
hyuhp-bah-kae-yoh
협박합니다
hyuhp-bah-kahm-nee-dah
Past
협박했어
hyuhp-bah-kae-ssuh
협박했어요
hyuhp-bah-kae-ssuh-yoh
협박했습니다
hyuhp-bah-kae-sseum-nee-dah
Future
협박할 거야
hyuhp-bah-kahl- -guh-yah
협박할 거예요
hyuhp-bah-kahl- -guh-yae-yoh
협박할 겁니다
hyuhp-bah-kahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
협박하세요
hyuhp-bah-kah-sae-yoh
Suggestion / Let's Polite (요)
협박해요
hyuhp-bah-kae-yoh
Question Polite (요)
협박해요?
hyuhp-bah-kae-yoh-?
Connective “and” — (고)
협박하고
hyuhp-bah-kah-goh
Conditional “if” — (면)
협박하면
hyuhp-bah-kah-myuhn
Noun form — (기)
협박함
hyuhp-bah-kahm