Verbseoul.
하다 verb
가세하다gasehadato support, to side with

To say to support, to side with politely in the present tense, use 가세해요 (gah-sae-hae-yoh). Below is the full conjugation of 가세하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
가세해
gah-sae-hae
가세해요
gah-sae-hae-yoh
가세합니다
gah-sae-hahm-nee-dah
Past
가세했어
gah-sae-hae-ssuh
가세했어요
gah-sae-hae-ssuh-yoh
가세했습니다
gah-sae-hae-sseum-nee-dah
Future
가세할 거야
gah-sae-hahl- -guh-yah
가세할 거예요
gah-sae-hahl- -guh-yae-yoh
가세할 겁니다
gah-sae-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
가세하세요
gah-sae-hah-sae-yoh
Suggestion / Let's Polite (요)
가세해요
gah-sae-hae-yoh
Question Polite (요)
가세해요?
gah-sae-hae-yoh-?
Connective “and” — (고)
가세하고
gah-sae-hah-goh
Conditional “if” — (면)
가세하면
gah-sae-hah-myuhn
Noun form — (기)
가세함
gah-sae-hahm