Verbseoul.
하다 verb
추가하다chugahadato add

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

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
추가해
choo-gah-hae
추가해요
choo-gah-hae-yoh
추가합니다
choo-gah-hahm-nee-dah
Past
추가했어
choo-gah-hae-ssuh
추가했어요
choo-gah-hae-ssuh-yoh
추가했습니다
choo-gah-hae-sseum-nee-dah
Future
추가할 거야
choo-gah-hahl- -guh-yah
추가할 거예요
choo-gah-hahl- -guh-yae-yoh
추가할 겁니다
choo-gah-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
추가하세요
choo-gah-hah-sae-yoh
Suggestion / Let's Polite (요)
추가해요
choo-gah-hae-yoh
Question Polite (요)
추가해요?
choo-gah-hae-yoh-?
Connective “and” — (고)
추가하고
choo-gah-hah-goh
Conditional “if” — (면)
추가하면
choo-gah-hah-myuhn
Noun form — (기)
추가함
choo-gah-hahm