Verbseoul.
하다 verb
짐작하다jimjakhadato guess, to assume, to conjecture

To say to guess, to assume, to conjecture politely in the present tense, use 짐작해요 (cheem-chah-kae-yoh). Below is the full conjugation of 짐작하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
짐작해
cheem-chah-kae
짐작해요
cheem-chah-kae-yoh
짐작합니다
cheem-chah-kahm-nee-dah
Past
짐작했어
cheem-chah-kae-ssuh
짐작했어요
cheem-chah-kae-ssuh-yoh
짐작했습니다
cheem-chah-kae-sseum-nee-dah
Future
짐작할 거야
cheem-chah-kahl- -guh-yah
짐작할 거예요
cheem-chah-kahl- -guh-yae-yoh
짐작할 겁니다
cheem-chah-kahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
짐작하세요
cheem-chah-kah-sae-yoh
Suggestion / Let's Polite (요)
짐작해요
cheem-chah-kae-yoh
Question Polite (요)
짐작해요?
cheem-chah-kae-yoh-?
Connective “and” — (고)
짐작하고
cheem-chah-kah-goh
Conditional “if” — (면)
짐작하면
cheem-chah-kah-myuhn
Noun form — (기)
짐작함
cheem-chah-kahm