Verbseoul.
하다 verb
구별하다gubyeolhadato differentiate, to distinguish

To say to differentiate, to distinguish politely in the present tense, use 구별해요 (goo-byuhl-hae-yoh). Below is the full conjugation of 구별하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
구별해
goo-byuhl-hae
구별해요
goo-byuhl-hae-yoh
구별합니다
goo-byuhl-hahm-nee-dah
Past
구별했어
goo-byuhl-hae-ssuh
구별했어요
goo-byuhl-hae-ssuh-yoh
구별했습니다
goo-byuhl-hae-sseum-nee-dah
Future
구별할 거야
goo-byuhl-hahl- -guh-yah
구별할 거예요
goo-byuhl-hahl- -guh-yae-yoh
구별할 겁니다
goo-byuhl-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
구별하세요
goo-byuhl-hah-sae-yoh
Suggestion / Let's Polite (요)
구별해요
goo-byuhl-hae-yoh
Question Polite (요)
구별해요?
goo-byuhl-hae-yoh-?
Connective “and” — (고)
구별하고
goo-byuhl-hah-goh
Conditional “if” — (면)
구별하면
goo-byuhl-hah-myuhn
Noun form — (기)
구별함
goo-byuhl-hahm