Verbseoul.
하다 verb

조심하다 conjugation (josimhada, to be careful, beware, watch)

To say to be careful, beware, watch politely in the present tense, use 조심해요 (choh-sheem-hae-yoh) · josimhaeyo. Below is the full conjugation of 조심하다 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
조심해
choh-sheem-hae
josimhae
조심해요
choh-sheem-hae-yoh
josimhaeyo
조심합니다
choh-sheem-hahm-nee-dah
josimhamnida
Past
조심했어
choh-sheem-hae-ssuh
josimhaesseo
조심했어요
choh-sheem-hae-ssuh-yoh
josimhaesseoyo
조심했습니다
choh-sheem-hae-sseum-nee-dah
josimhaesseumnida
Future
조심할 거야
choh-sheem-hahl guh-yah
josimhal geoya
조심할 거예요
choh-sheem-hahl guh-yae-yoh
josimhal geoyeyo
조심할 겁니다
choh-sheem-hahl guhm-nee-dah
josimhal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
조심하세요
choh-sheem-hah-sae-yoh
josimhaseyo
Suggestion / Let's Polite (요)
조심해요
choh-sheem-hae-yoh
josimhaeyo
Question Polite (요)
조심해요?
choh-sheem-hae-yoh-?
josimhaeyo?
Connective "and" — (고)
조심하고
choh-sheem-hah-goh
josimhago
Conditional "if" — (면)
조심하면
choh-sheem-hah-myuhn
josimhamyeon
Progressive (고 있어요)
조심하고 있어요
choh-sheem-hah-goh ee-ssuh-yoh
josimhago isseoyo
Want to (고 싶어요)
조심하고 싶어요
choh-sheem-hah-goh shee-puh-yoh
josimhago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
조심할 수 있어요
choh-sheem-hahl soo ee-ssuh-yoh
josimhal su isseoyo
Because / So (아/어서)
조심해서
choh-sheem-hae-suh
josimhaeseo
Noun form — (기)
조심하기
choh-sheem-hah-gee
josimhagi
Noun form — (음)
조심함
choh-sheem-hahm
josimham