작용해
chah-gyohng-hae
jagyonghae
작용하다
To say to act on or affect something politely in the present tense, use 작용해요 (chah-gyohng-hae-yoh) · jagyonghaeyo. Below is the full conjugation of 작용하다 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
| Tense | Casual (반말) | Polite (요) | Formal (합니다) |
|---|---|---|---|
| Present | 작용해요 chah-gyohng-hae-yoh jagyonghaeyo | 작용합니다 chah-gyohng-hahm-nee-dah jagyonghamnida | |
| Past | 작용했어 chah-gyohng-hae-ssuh jagyonghaesseo | 작용했어요 chah-gyohng-hae-ssuh-yoh jagyonghaesseoyo | 작용했습니다 chah-gyohng-hae-sseum-nee-dah jagyonghaesseumnida |
| Future | 작용할 거야 chah-gyohng-hahl guh-yah jagyonghal geoya | 작용할 거예요 chah-gyohng-hahl guh-yae-yoh jagyonghal geoyeyo | 작용할 겁니다 chah-gyohng-hahl guhm-nee-dah jagyonghal geomnida |
Other useful forms
Honorific / Command Polite (-(으)세요)
작용하세요
chah-gyohng-hah-sae-yoh
jagyonghaseyo
Suggestion / Let's Polite (요)
작용해요
chah-gyohng-hae-yoh
jagyonghaeyo
Question Polite (요)
작용해요?
chah-gyohng-hae-yoh-?
jagyonghaeyo?
Connective "and" — (고)
작용하고
chah-gyohng-hah-goh
jagyonghago
Conditional "if" — (면)
작용하면
chah-gyohng-hah-myuhn
jagyonghamyeon
Progressive (고 있어요)
작용하고 있어요
chah-gyohng-hah-goh ee-ssuh-yoh
jagyonghago isseoyo
Want to (고 싶어요)
작용하고 싶어요
chah-gyohng-hah-goh shee-puh-yoh
jagyonghago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
작용할 수 있어요
chah-gyohng-hahl soo ee-ssuh-yoh
jagyonghal su isseoyo
Because / So (아/어서)
작용해서
chah-gyohng-hae-suh
jagyonghaeseo
Noun form — (기)
작용하기
chah-gyohng-hah-gee
jagyonghagi
Noun form — (음)
작용함
chah-gyohng-hahm
jagyongham