Verbseoul.
하다 verb
처신하다cheosinhadato behave, to conduct oneself

To say to behave, to conduct oneself politely in the present tense, use 처신해요 (chuh-sheen-hae-yoh). Below is the full conjugation of 처신하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
처신해
chuh-sheen-hae
처신해요
chuh-sheen-hae-yoh
처신합니다
chuh-sheen-hahm-nee-dah
Past
처신했어
chuh-sheen-hae-ssuh
처신했어요
chuh-sheen-hae-ssuh-yoh
처신했습니다
chuh-sheen-hae-sseum-nee-dah
Future
처신할 거야
chuh-sheen-hahl- -guh-yah
처신할 거예요
chuh-sheen-hahl- -guh-yae-yoh
처신할 겁니다
chuh-sheen-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
처신하세요
chuh-sheen-hah-sae-yoh
Suggestion / Let's Polite (요)
처신해요
chuh-sheen-hae-yoh
Question Polite (요)
처신해요?
chuh-sheen-hae-yoh-?
Connective “and” — (고)
처신하고
chuh-sheen-hah-goh
Conditional “if” — (면)
처신하면
chuh-sheen-hah-myuhn
Noun form — (기)
처신함
chuh-sheen-hahm