Verbseoul.
하다 verb
가정하다gajeonghadato hypothesise, to make a hypothesis

To say to hypothesise, to make a hypothesis politely in the present tense, use 가정해요 (gah-chuhng-hae-yoh). Below is the full conjugation of 가정하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
가정해
gah-chuhng-hae
가정해요
gah-chuhng-hae-yoh
가정합니다
gah-chuhng-hahm-nee-dah
Past
가정했어
gah-chuhng-hae-ssuh
가정했어요
gah-chuhng-hae-ssuh-yoh
가정했습니다
gah-chuhng-hae-sseum-nee-dah
Future
가정할 거야
gah-chuhng-hahl- -guh-yah
가정할 거예요
gah-chuhng-hahl- -guh-yae-yoh
가정할 겁니다
gah-chuhng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
가정하세요
gah-chuhng-hah-sae-yoh
Suggestion / Let's Polite (요)
가정해요
gah-chuhng-hae-yoh
Question Polite (요)
가정해요?
gah-chuhng-hae-yoh-?
Connective “and” — (고)
가정하고
gah-chuhng-hah-goh
Conditional “if” — (면)
가정하면
gah-chuhng-hah-myuhn
Noun form — (기)
가정함
gah-chuhng-hahm