Verbseoul.
regular
그르치다geureuchidato ruin

To say to ruin politely in the present tense, use 그르쳐요 (geu-reu-chyuh-yoh). Below is the full conjugation of 그르치다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
그르쳐
geu-reu-chyuh
그르쳐요
geu-reu-chyuh-yoh
그르칩니다
geu-reu-cheem-nee-dah
Past
그르쳤어
geu-reu-chyuh-ssuh
그르쳤어요
geu-reu-chyuh-ssuh-yoh
그르쳤습니다
geu-reu-chyuh-sseum-nee-dah
Future
그르칠 거야
geu-reu-cheel- -guh-yah
그르칠 거예요
geu-reu-cheel- -guh-yae-yoh
그르칠 겁니다
geu-reu-cheel- -guhm-nee-dah

Other useful forms

Command Polite (세요)
그르치세요
geu-reu-chee-sae-yoh
Suggestion / Let's Polite (요)
그르쳐요
geu-reu-chyuh-yoh
Question Polite (요)
그르쳐요?
geu-reu-chyuh-yoh-?
Connective “and” — (고)
그르치고
geu-reu-chee-goh
Conditional “if” — (면)
그르치면
geu-reu-chee-myuhn
Noun form — (기)
그르침
geu-reu-cheem