Verbseoul.
하다 verb

가공하다 conjugation (gagonghada, to process or treat)

To say to process or treat politely in the present tense, use 가공해요 (gah-gohng-hae-yoh) · gagonghaeyo. Below is the full conjugation of 가공하다 across the three tenses and three everyday speech levels.

Grammar note (하다 verb): 하다 verbs are formed with a Sino-Korean noun + 하다 (e.g. 공부하다 = study + do). 하다 conjugates irregularly: the ㅏ in 하 contracts with the -아/-어 suffix to give 해 (not *하어). Present polite: 해요; past polite: 했어요. The formal ending is 합니다 (not *하습니다). Most noun+하다 compounds follow this pattern uniformly. See all 하다 verbs →

Conjugation table

pron. = pronunciation guide  · RR = Revised Romanization

Highlighted = where the stem changes

TenseCasual (반말)Polite (요)Formal (합니다)
Present
가공해
gah-gohng-hae
gagonghae
가공해요
gah-gohng-hae-yoh
gagonghaeyo
가공합니다
gah-gohng-hahm-nee-dah
gagonghamnida
Past
가공했어
gah-gohng-hae-ssuh
gagonghaesseo
가공했어요
gah-gohng-hae-ssuh-yoh
gagonghaesseoyo
가공했습니다
gah-gohng-hae-sseum-nee-dah
gagonghaesseumnida
Future
가공할 거야
gah-gohng-hahl guh-yah
gagonghal geoya
가공할 거예요
gah-gohng-hahl guh-yae-yoh
gagonghal geoyeyo
가공할 겁니다
gah-gohng-hahl guhm-nee-dah
gagonghal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
가공하세요
gah-gohng-hah-sae-yoh
gagonghaseyo
Suggestion / Let's Polite (요)
가공해요
gah-gohng-hae-yoh
gagonghaeyo
Question Polite (요)
가공해요?
gah-gohng-hae-yoh-?
gagonghaeyo?
Connective "and" — (고)
가공하고
gah-gohng-hah-goh
gagonghago
Conditional "if" — (면)
가공하면
gah-gohng-hah-myuhn
gagonghamyeon
Progressive (고 있어요)
가공하고 있어요
gah-gohng-hah-goh ee-ssuh-yoh
gagonghago isseoyo
Want to (고 싶어요)
가공하고 싶어요
gah-gohng-hah-goh shee-puh-yoh
gagonghago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
가공할 수 있어요
gah-gohng-hahl soo ee-ssuh-yoh
gagonghal su isseoyo
Because / So (아/어서)
가공해서
gah-gohng-hae-suh
gagonghaeseo
Noun form — (기)
가공하기
gah-gohng-hah-gee
gagonghagi
Noun form — (음)
가공함
gah-gohng-hahm
gagongham