Verbseoul.
하다 verb
실수하다silsuhadato make a mistake

To say to make a mistake politely in the present tense, use 실수해요 (sheel-soo-hae-yoh). Below is the full conjugation of 실수하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
실수해
sheel-soo-hae
실수해요
sheel-soo-hae-yoh
실수합니다
sheel-soo-hahm-nee-dah
Past
실수했어
sheel-soo-hae-ssuh
실수했어요
sheel-soo-hae-ssuh-yoh
실수했습니다
sheel-soo-hae-sseum-nee-dah
Future
실수할 거야
sheel-soo-hahl- -guh-yah
실수할 거예요
sheel-soo-hahl- -guh-yae-yoh
실수할 겁니다
sheel-soo-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
실수하세요
sheel-soo-hah-sae-yoh
Suggestion / Let's Polite (요)
실수해요
sheel-soo-hae-yoh
Question Polite (요)
실수해요?
sheel-soo-hae-yoh-?
Connective “and” — (고)
실수하고
sheel-soo-hah-goh
Conditional “if” — (면)
실수하면
sheel-soo-hah-myuhn
Noun form — (기)
실수함
sheel-soo-hahm