Verbseoul.
하다 verb
행동하다haengdonghadato behave

To say to behave politely in the present tense, use 행동해요 (haeng-dohng-hae-yoh). Below is the full conjugation of 행동하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
행동해
haeng-dohng-hae
행동해요
haeng-dohng-hae-yoh
행동합니다
haeng-dohng-hahm-nee-dah
Past
행동했어
haeng-dohng-hae-ssuh
행동했어요
haeng-dohng-hae-ssuh-yoh
행동했습니다
haeng-dohng-hae-sseum-nee-dah
Future
행동할 거야
haeng-dohng-hahl- -guh-yah
행동할 거예요
haeng-dohng-hahl- -guh-yae-yoh
행동할 겁니다
haeng-dohng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
행동하세요
haeng-dohng-hah-sae-yoh
Suggestion / Let's Polite (요)
행동해요
haeng-dohng-hae-yoh
Question Polite (요)
행동해요?
haeng-dohng-hae-yoh-?
Connective “and” — (고)
행동하고
haeng-dohng-hah-goh
Conditional “if” — (면)
행동하면
haeng-dohng-hah-myuhn
Noun form — (기)
행동함
haeng-dohng-hahm