Verbseoul.
하다 verb
가산하다gasanhadato add

To say to add politely in the present tense, use 가산해요 (gah-sahn-hae-yoh). Below is the full conjugation of 가산하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
가산해
gah-sahn-hae
가산해요
gah-sahn-hae-yoh
가산합니다
gah-sahn-hahm-nee-dah
Past
가산했어
gah-sahn-hae-ssuh
가산했어요
gah-sahn-hae-ssuh-yoh
가산했습니다
gah-sahn-hae-sseum-nee-dah
Future
가산할 거야
gah-sahn-hahl- -guh-yah
가산할 거예요
gah-sahn-hahl- -guh-yae-yoh
가산할 겁니다
gah-sahn-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
가산하세요
gah-sahn-hah-sae-yoh
Suggestion / Let's Polite (요)
가산해요
gah-sahn-hae-yoh
Question Polite (요)
가산해요?
gah-sahn-hae-yoh-?
Connective “and” — (고)
가산하고
gah-sahn-hah-goh
Conditional “if” — (면)
가산하면
gah-sahn-hah-myuhn
Noun form — (기)
가산함
gah-sahn-hahm