Verbseoul.
하다 verb
침묵하다chimmukhadato be silent, reticent, to be quiet

To say to be silent, reticent, to be quiet politely in the present tense, use 침묵해요 (cheem-moo-kae-yoh). Below is the full conjugation of 침묵하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
침묵해
cheem-moo-kae
침묵해요
cheem-moo-kae-yoh
침묵합니다
cheem-moo-kahm-nee-dah
Past
침묵했어
cheem-moo-kae-ssuh
침묵했어요
cheem-moo-kae-ssuh-yoh
침묵했습니다
cheem-moo-kae-sseum-nee-dah
Future
침묵할 거야
cheem-moo-kahl- -guh-yah
침묵할 거예요
cheem-moo-kahl- -guh-yae-yoh
침묵할 겁니다
cheem-moo-kahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
침묵하세요
cheem-moo-kah-sae-yoh
Suggestion / Let's Polite (요)
침묵해요
cheem-moo-kae-yoh
Question Polite (요)
침묵해요?
cheem-moo-kae-yoh-?
Connective “and” — (고)
침묵하고
cheem-moo-kah-goh
Conditional “if” — (면)
침묵하면
cheem-moo-kah-myuhn
Noun form — (기)
침묵함
cheem-moo-kahm