Verbseoul.
하다 verb

추측하다 conjugation (chucheukhada, to guess, to surmise, to conjecture)

To say to guess, to surmise, to conjecture politely in the present tense, use 추측해요 (choo-cheu-kae-yoh) · chucheukaeyo. Below is the full conjugation of 추측하다 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
추측해
choo-cheu-kae
chucheukae
추측해요
choo-cheu-kae-yoh
chucheukaeyo
추측합니다
choo-cheu-kahm-nee-dah
chucheukamnida
Past
추측했어
choo-cheu-kae-ssuh
chucheukaesseo
추측했어요
choo-cheu-kae-ssuh-yoh
chucheukaesseoyo
추측했습니다
choo-cheu-kae-sseum-nee-dah
chucheukaesseumnida
Future
추측할 거야
choo-cheu-kahl guh-yah
chucheukal geoya
추측할 거예요
choo-cheu-kahl guh-yae-yoh
chucheukal geoyeyo
추측할 겁니다
choo-cheu-kahl guhm-nee-dah
chucheukal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
추측하세요
choo-cheu-kah-sae-yoh
chucheukaseyo
Suggestion / Let's Polite (요)
추측해요
choo-cheu-kae-yoh
chucheukaeyo
Question Polite (요)
추측해요?
choo-cheu-kae-yoh-?
chucheukaeyo?
Connective "and" — (고)
추측하고
choo-cheu-kah-goh
chucheukago
Conditional "if" — (면)
추측하면
choo-cheu-kah-myuhn
chucheukamyeon
Progressive (고 있어요)
추측하고 있어요
choo-cheu-kah-goh ee-ssuh-yoh
chucheukago isseoyo
Want to (고 싶어요)
추측하고 싶어요
choo-cheu-kah-goh shee-puh-yoh
chucheukago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
추측할 수 있어요
choo-cheu-kahl soo ee-ssuh-yoh
chucheukal su isseoyo
Because / So (아/어서)
추측해서
choo-cheu-kae-suh
chucheukaeseo
Noun form — (기)
추측하기
choo-cheu-kah-gee
chucheukagi
Noun form — (음)
추측함
choo-cheu-kahm
chucheukam