Verbseoul.
하다 verb

가정하다 conjugation (gajeonghada, to hypothesise, to make a hypothesis)

To say to hypothesise, to make a hypothesis politely in the present tense, use 가정해요 (gah-chuhng-hae-yoh) · gajeonghaeyo. Below is the full conjugation of 가정하다 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
가정해
gah-chuhng-hae
gajeonghae
가정해요
gah-chuhng-hae-yoh
gajeonghaeyo
가정합니다
gah-chuhng-hahm-nee-dah
gajeonghamnida
Past
가정했어
gah-chuhng-hae-ssuh
gajeonghaesseo
가정했어요
gah-chuhng-hae-ssuh-yoh
gajeonghaesseoyo
가정했습니다
gah-chuhng-hae-sseum-nee-dah
gajeonghaesseumnida
Future
가정할 거야
gah-chuhng-hahl guh-yah
gajeonghal geoya
가정할 거예요
gah-chuhng-hahl guh-yae-yoh
gajeonghal geoyeyo
가정할 겁니다
gah-chuhng-hahl guhm-nee-dah
gajeonghal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
가정하세요
gah-chuhng-hah-sae-yoh
gajeonghaseyo
Suggestion / Let's Polite (요)
가정해요
gah-chuhng-hae-yoh
gajeonghaeyo
Question Polite (요)
가정해요?
gah-chuhng-hae-yoh-?
gajeonghaeyo?
Connective "and" — (고)
가정하고
gah-chuhng-hah-goh
gajeonghago
Conditional "if" — (면)
가정하면
gah-chuhng-hah-myuhn
gajeonghamyeon
Progressive (고 있어요)
가정하고 있어요
gah-chuhng-hah-goh ee-ssuh-yoh
gajeonghago isseoyo
Want to (고 싶어요)
가정하고 싶어요
gah-chuhng-hah-goh shee-puh-yoh
gajeonghago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
가정할 수 있어요
gah-chuhng-hahl soo ee-ssuh-yoh
gajeonghal su isseoyo
Because / So (아/어서)
가정해서
gah-chuhng-hae-suh
gajeonghaeseo
Noun form — (기)
가정하기
gah-chuhng-hah-gee
gajeonghagi
Noun form — (음)
가정함
gah-chuhng-hahm
gajeongham