Verbseoul.
하다 verb
상상하다sangsanghadato imagine

To say to imagine politely in the present tense, use 상상해요 (sahng-sahng-hae-yoh). Below is the full conjugation of 상상하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
상상해
sahng-sahng-hae
상상해요
sahng-sahng-hae-yoh
상상합니다
sahng-sahng-hahm-nee-dah
Past
상상했어
sahng-sahng-hae-ssuh
상상했어요
sahng-sahng-hae-ssuh-yoh
상상했습니다
sahng-sahng-hae-sseum-nee-dah
Future
상상할 거야
sahng-sahng-hahl- -guh-yah
상상할 거예요
sahng-sahng-hahl- -guh-yae-yoh
상상할 겁니다
sahng-sahng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
상상하세요
sahng-sahng-hah-sae-yoh
Suggestion / Let's Polite (요)
상상해요
sahng-sahng-hae-yoh
Question Polite (요)
상상해요?
sahng-sahng-hae-yoh-?
Connective “and” — (고)
상상하고
sahng-sahng-hah-goh
Conditional “if” — (면)
상상하면
sahng-sahng-hah-myuhn
Noun form — (기)
상상함
sahng-sahng-hahm