Verbseoul.
하다 verb (adj)
수상하다susanghadato be strange, to be suspicious

To say to be strange, to be suspicious politely in the present tense, use 수상해요 (soo-sahng-hae-yoh). Below is the full conjugation of 수상하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
수상해
soo-sahng-hae
수상해요
soo-sahng-hae-yoh
수상합니다
soo-sahng-hahm-nee-dah
Past
수상했어
soo-sahng-hae-ssuh
수상했어요
soo-sahng-hae-ssuh-yoh
수상했습니다
soo-sahng-hae-sseum-nee-dah
Future
수상할 거야
soo-sahng-hahl- -guh-yah
수상할 거예요
soo-sahng-hahl- -guh-yae-yoh
수상할 겁니다
soo-sahng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
수상하세요
soo-sahng-hah-sae-yoh
Suggestion / Let's Polite (요)
수상해요
soo-sahng-hae-yoh
Question Polite (요)
수상해요?
soo-sahng-hae-yoh-?
Connective “and” — (고)
수상하고
soo-sahng-hah-goh
Conditional “if” — (면)
수상하면
soo-sahng-hah-myuhn
Noun form — (기)
수상함
soo-sahng-hahm