Verbseoul.
하다 verb
갈음하다galeumhadato substitute

To say to substitute politely in the present tense, use 갈음해요 (gah-reum-hae-yoh). Below is the full conjugation of 갈음하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
갈음해
gah-reum-hae
갈음해요
gah-reum-hae-yoh
갈음합니다
gah-reum-hahm-nee-dah
Past
갈음했어
gah-reum-hae-ssuh
갈음했어요
gah-reum-hae-ssuh-yoh
갈음했습니다
gah-reum-hae-sseum-nee-dah
Future
갈음할 거야
gah-reum-hahl- -guh-yah
갈음할 거예요
gah-reum-hahl- -guh-yae-yoh
갈음할 겁니다
gah-reum-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
갈음하세요
gah-reum-hah-sae-yoh
Suggestion / Let's Polite (요)
갈음해요
gah-reum-hae-yoh
Question Polite (요)
갈음해요?
gah-reum-hae-yoh-?
Connective “and” — (고)
갈음하고
gah-reum-hah-goh
Conditional “if” — (면)
갈음하면
gah-reum-hah-myuhn
Noun form — (기)
갈음함
gah-reum-hahm