Verbseoul.
하다 verb
근거하다geungeohadato base

To say to base politely in the present tense, use 근거해요 (geun-guh-hae-yoh). Below is the full conjugation of 근거하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
근거해
geun-guh-hae
근거해요
geun-guh-hae-yoh
근거합니다
geun-guh-hahm-nee-dah
Past
근거했어
geun-guh-hae-ssuh
근거했어요
geun-guh-hae-ssuh-yoh
근거했습니다
geun-guh-hae-sseum-nee-dah
Future
근거할 거야
geun-guh-hahl- -guh-yah
근거할 거예요
geun-guh-hahl- -guh-yae-yoh
근거할 겁니다
geun-guh-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
근거하세요
geun-guh-hah-sae-yoh
Suggestion / Let's Polite (요)
근거해요
geun-guh-hae-yoh
Question Polite (요)
근거해요?
geun-guh-hae-yoh-?
Connective “and” — (고)
근거하고
geun-guh-hah-goh
Conditional “if” — (면)
근거하면
geun-guh-hah-myuhn
Noun form — (기)
근거함
geun-guh-hahm