Verbseoul.
하다 verb

자극하다 conjugation (jageukhada, to irritate, to stimulate)

To say to irritate, to stimulate politely in the present tense, use 자극해요 (chah-geu-kae-yoh) · jageukaeyo. Below is the full conjugation of 자극하다 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
자극해
chah-geu-kae
jageukae
자극해요
chah-geu-kae-yoh
jageukaeyo
자극합니다
chah-geu-kahm-nee-dah
jageukamnida
Past
자극했어
chah-geu-kae-ssuh
jageukaesseo
자극했어요
chah-geu-kae-ssuh-yoh
jageukaesseoyo
자극했습니다
chah-geu-kae-sseum-nee-dah
jageukaesseumnida
Future
자극할 거야
chah-geu-kahl guh-yah
jageukal geoya
자극할 거예요
chah-geu-kahl guh-yae-yoh
jageukal geoyeyo
자극할 겁니다
chah-geu-kahl guhm-nee-dah
jageukal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
자극하세요
chah-geu-kah-sae-yoh
jageukaseyo
Suggestion / Let's Polite (요)
자극해요
chah-geu-kae-yoh
jageukaeyo
Question Polite (요)
자극해요?
chah-geu-kae-yoh-?
jageukaeyo?
Connective "and" — (고)
자극하고
chah-geu-kah-goh
jageukago
Conditional "if" — (면)
자극하면
chah-geu-kah-myuhn
jageukamyeon
Progressive (고 있어요)
자극하고 있어요
chah-geu-kah-goh ee-ssuh-yoh
jageukago isseoyo
Want to (고 싶어요)
자극하고 싶어요
chah-geu-kah-goh shee-puh-yoh
jageukago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
자극할 수 있어요
chah-geu-kahl soo ee-ssuh-yoh
jageukal su isseoyo
Because / So (아/어서)
자극해서
chah-geu-kae-suh
jageukaeseo
Noun form — (기)
자극하기
chah-geu-kah-gee
jageukagi
Noun form — (음)
자극함
chah-geu-kahm
jageukam