Verbseoul.
르 irregular (adj)
예절바르다yejeolbareudato behave well, to have good breeding

To say to behave well, to have good breeding politely in the present tense, use 예절발라요 (yae-chuhl-bahl-rah-yoh). Below is the full conjugation of 예절바르다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
예절발라
yae-chuhl-bahl-rah
예절발라요
yae-chuhl-bahl-rah-yoh
예절바릅니다
yae-chuhl-bah-reum-nee-dah
Past
예절발랐어
yae-chuhl-bahl-rah-ssuh
예절발랐어요
yae-chuhl-bahl-rah-ssuh-yoh
예절발랐습니다
yae-chuhl-bahl-rah-sseum-nee-dah
Future
예절바를 거야
yae-chuhl-bah-reul- -guh-yah
예절바를 거예요
yae-chuhl-bah-reul- -guh-yae-yoh
예절바를 겁니다
yae-chuhl-bah-reul- -guhm-nee-dah

Other useful forms

Command Polite (세요)
예절바르세요
yae-chuhl-bah-reu-sae-yoh
Suggestion / Let's Polite (요)
예절발라요
yae-chuhl-bahl-rah-yoh
Question Polite (요)
예절발라요?
yae-chuhl-bahl-rah-yoh-?
Connective “and” — (고)
예절바르고
yae-chuhl-bah-reu-goh
Conditional “if” — (면)
예절바르면
yae-chuhl-bah-reu-myuhn
Noun form — (기)
예절바름
yae-chuhl-bah-reum