Verbseoul.
하다 verb
자극하다jageukhadato irritate, to stimulate

To say to irritate, to stimulate politely in the present tense, use 자극해요 (chah-geu-kae-yoh). Below is the full conjugation of 자극하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
자극해
chah-geu-kae
자극해요
chah-geu-kae-yoh
자극합니다
chah-geu-kahm-nee-dah
Past
자극했어
chah-geu-kae-ssuh
자극했어요
chah-geu-kae-ssuh-yoh
자극했습니다
chah-geu-kae-sseum-nee-dah
Future
자극할 거야
chah-geu-kahl- -guh-yah
자극할 거예요
chah-geu-kahl- -guh-yae-yoh
자극할 겁니다
chah-geu-kahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
자극하세요
chah-geu-kah-sae-yoh
Suggestion / Let's Polite (요)
자극해요
chah-geu-kae-yoh
Question Polite (요)
자극해요?
chah-geu-kae-yoh-?
Connective “and” — (고)
자극하고
chah-geu-kah-goh
Conditional “if” — (면)
자극하면
chah-geu-kah-myuhn
Noun form — (기)
자극함
chah-geu-kahm